{"id":110513,"date":"2020-12-28T06:00:08","date_gmt":"2020-12-28T14:00:08","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=110513"},"modified":"2020-12-28T03:02:07","modified_gmt":"2020-12-28T11:02:07","slug":"dns-vulnerabilities","status":"publish","type":"post","link":"https:\/\/origin-unit42.paloaltonetworks.com\/ja\/dns-vulnerabilities\/","title":{"rendered":"DNS\u306e\u8106\u5f31\u6027\u306e\u6b74\u53f2\u3068\u30af\u30e9\u30a6\u30c9"},"content":{"rendered":"<h2><a id=\"post-110465-_9ojx5m2glpx4\"><\/a>\u6982\u8981<\/h2>\n<p>\u6642\u6298\u3001\u4e16\u754c\u4e2d\u306e\u4f55\u5341\u5104\u53f0\u3082\u306e\u30c7\u30d0\u30a4\u30b9\u3092\u5371\u967a\u306b\u3055\u3089\u3059\u3001\u65b0\u305f\u306aDomain Name System (\u30c9\u30e1\u30a4\u30f3 \u30cd\u30fc\u30e0 \u30b7\u30b9\u30c6\u30e0 - DNS)\u306e\u8106\u5f31\u6027\u304c\u767a\u898b\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4e00\u822c\u306b\u3001DNS\u306e\u8106\u5f31\u6027\u306f\u91cd\u5927\u3067\u3059\u3002\u81ea\u5206\u306e\u9280\u884c\u53e3\u5ea7\u306eWeb\u30b5\u30a4\u30c8\u3092\u95b2\u89a7\u3057\u305f\u3068\u304d\u306b\u3001DNS\u30ea\u30be\u30eb\u30d0\u304c\u9280\u884c\u306eWeb\u30b5\u30a4\u30c8\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u8fd4\u3059\u4ee3\u308f\u308a\u306b\u3001\u653b\u6483\u8005\u306eWeb\u30b5\u30a4\u30c8\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u8fd4\u3059\u3053\u3068\u3092\u60f3\u50cf\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u653b\u6483\u8005\u306eWeb\u30b5\u30a4\u30c8\u306f\u3001\u9280\u884c\u306eWeb\u30b5\u30a4\u30c8\u3068\u305d\u3063\u304f\u308a\u3067\u3059\u3002\u305d\u308c\u3060\u3051\u3067\u306f\u306a\u304f\u3001URL\u30d0\u30fc\u306b\u3082\u9593\u9055\u3044\u306f\u898b\u5f53\u305f\u308a\u307e\u305b\u3093\u3002\u30d6\u30e9\u30a6\u30b6\u304c\u3001\u9280\u884c\u306eWeb\u30b5\u30a4\u30c8\u3067\u3042\u308b\u3068\u672c\u5f53\u306b\u8a8d\u8b58\u3057\u3066\u3044\u308b\u305f\u3081\u3067\u3059\u3002\u3053\u308c\u304c\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u4e00\u4f8b\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u30d6\u30ed\u30b0\u3067\u306f\u3001DNS\u306b\u3064\u3044\u3066\u8aac\u660e\u3059\u308b\u307b\u304b\u3001\u904e\u53bb\u306e\u8106\u5f31\u6027\u304b\u3089\u6700\u8fd1\u767a\u898b\u3055\u308c\u305f\u9ad8\u5ea6\u306a\u3082\u306e\u307e\u3067\u3001DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u8106\u5f31\u6027\u306e\u6b74\u53f2\u3092\u632f\u308a\u8fd4\u308a\u307e\u3059\u3002<\/p>\n<p>\u672c\u30d6\u30ed\u30b0\u3067\u53d6\u308a\u4e0a\u3052\u308b\u8106\u5f31\u6027\u306f\u3001\u904e\u53bb20\u5e74\u9593\u306b\u884c\u308f\u308c\u305f\u307b\u307c\u3059\u3079\u3066\u306eDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u306b\u5229\u7528\u3055\u308c\u3066\u304d\u305f\u8106\u5f31\u6027\u3067\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u304a\u5ba2\u69d8\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5(<a href=\"https:\/\/www.paloaltonetworks.com\/network-security\/next-generation-firewall\">\u6b21\u4e16\u4ee3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb<\/a>\u306e<a href=\"https:\/\/www.paloaltonetworks.com\/products\/threat-detection-and-prevention\/dns-security\">DNS\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b5\u30fc\u30d3\u30b9<\/a> \u30b5\u30d6\u30b9\u30af\u30ea\u30d7\u30b7\u30e7\u30f3\u304a\u3088\u3073<a href=\"https:\/\/www.paloaltonetworks.com\/prisma\/cloud\">Prisma Cloud<\/a>)\u306b\u3088\u3063\u3066\u3001\u672c\u30d6\u30ed\u30b0\u3067\u6982\u8aac\u3059\u308b\u653b\u6483\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2><a id=\"post-110465-_pzu3djexkt45\"><\/a>DNS\u3068\u306f\u4f55\u304b?<\/h2>\n<p>Domain Name System (\u30c9\u30e1\u30a4\u30f3 \u30cd\u30fc\u30e0 \u30b7\u30b9\u30c6\u30e0 - DNS)\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8(\u307e\u305f\u306f\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af)\u306b\u63a5\u7d9a\u3055\u308c\u305f\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u3001\u30b5\u30fc\u30d3\u30b9\u3001\u305d\u306e\u4ed6\u306e\u30ea\u30bd\u30fc\u30b9\u306e\u968e\u5c64\u69cb\u9020\u306e\u5206\u6563\u578b\u30cd\u30fc\u30e0\u30b7\u30b9\u30c6\u30e0\u3067\u3059\u3002\u3055\u307e\u3056\u307e\u306a\u60c5\u5831\u3092\u3001\u53c2\u52a0\u3057\u3066\u3044\u308b\u5404\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u5272\u308a\u5f53\u3066\u3089\u308c\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u540d\u306b\u95a2\u9023\u4ed8\u3051\u307e\u3059\u3002<\/p>\n<p>\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001DNS\u3068\u306f\u3001\u4e3b\u3068\u3057\u3066\u540d\u524d\u3092IP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3059\u3002<span style=\"font-family: 'courier new', courier, monospace;\">http:\/\/www.example.com<\/span>\u3092\u95b2\u89a7\u3059\u308b\u3068\u304d\u306b\u3001<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u306f<span style=\"font-family: 'courier new', courier, monospace;\">93.184.216.34<\/span>\u306a\u3069\u306e\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_h26xln29ofef\"><\/a><strong>DNS\u30b5\u30fc\u30d0\u30fc\u3068\u306f\u4f55\u304b?<\/strong><\/h4>\n<p>DNS\u30b5\u30fc\u30d0\u30fc\u306fDNS\u89e3\u6c7a\u3092\u63d0\u4f9b\u3059\u308b\u30c7\u30d0\u30a4\u30b9\u307e\u305f\u306f\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u3001\u901a\u5e38\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u307b\u3068\u3093\u3069\u306e\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u304a\u3088\u3073\u30e2\u30d0\u30a4\u30eb\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308bDNS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3001DNS\u30b5\u30fc\u30d0\u30fc\u3068\u3084\u308a\u53d6\u308a\u3057\u3066\u540d\u524d\u3092IP\u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n<p>\u7d50\u5c40\u306e\u3068\u3053\u308d\u3001\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068\u518d\u5e30\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068\u3044\u30462\u3064\u306e\u30bf\u30a4\u30d7\u306e\u30b5\u30fc\u30d0\u30fc\u3057\u304b\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u3092\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306f\u30c9\u30e1\u30a4\u30f3\u3092\u6271\u3046\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3067\u3001\u30c1\u30a7\u30fc\u30f3\u306e\u6700\u5f8c\u306b\u4f4d\u7f6e\u3057\u3066\u3044\u307e\u3059\u3002\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u4ee5\u5916\u306e\u3082\u306e\u306f\u3001\u3059\u3079\u3066\u518d\u5e30\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3067\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30eb\u30fc\u30bf\u30fc\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3001ISP\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3001Kubernetes\u30af\u30e9\u30b9\u30bf\u306eDNS\u30b5\u30fc\u30d0\u30fc\u306f\u3059\u3079\u3066\u518d\u5e30\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3067\u3059\u3002\u518d\u5e30\u30b5\u30fc\u30d0\u30fc\u306f\u3059\u3079\u3066\u3001\u540c\u3058\u3088\u3046\u306b\u52d5\u4f5c\u3057\u307e\u3059\u3002\u4f55\u56de\u304b\u306e\u518d\u5e30\u306e\u5f8c\u3001\u6700\u5f8c\u306b\u3001\u76ee\u7684\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u554f\u3044\u5408\u308f\u305b\u307e\u3059(\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3068\u518d\u5e30\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u4e21\u65b9\u306e\u6a5f\u80fd\u3092\u5b9f\u884c\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u3082\u3042\u308a\u307e\u3059\u304c\u3001\u672c\u30d6\u30ed\u30b0\u3067\u306f\u53d6\u308a\u4e0a\u3052\u307e\u305b\u3093)\u3002<\/p>\n<h4><a id=\"post-110465-_p9uccfqivp20\"><\/a><strong>\u4ed5\u7d44\u307f<\/strong><\/h4>\n<figure id=\"attachment_110470\" aria-describedby=\"caption-attachment-110470\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-110471 lozad\"  data-src=\"https:\/\/unit42-preview.paloaltonetworks.com\/wp-content\/uploads\/2020\/12\/word-image-225.png\" alt=\"\u3053\u306eDNS\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u56f3\u306f\u3001\u8981\u6c42\u304c\u30c7\u30d0\u30a4\u30b9\u304b\u3089\u30eb\u30fc\u30bf\u30fc\u306e\u30ea\u30be\u30eb\u30d0\u3001\u305d\u3057\u3066\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u3001TLD\u30b5\u30fc\u30d0\u30fc\u3001\u8981\u6c42\u3055\u308c\u305fWeb\u30b5\u30a4\u30c8\u306e\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\u3078\u3068\u6d41\u308c\u308b\u6a21\u69d8\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002 \" width=\"900\" height=\"400\" \/><figcaption id=\"caption-attachment-110470\" class=\"wp-caption-text\">\u56f31: DNS\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u4ed5\u7d44\u307f<\/figcaption><\/figure>\n<p><em><br \/>\n<\/em>DNS\u30ea\u30be\u30eb\u30d0\u306fDNS\u968e\u5c64\u306e(\u305f\u3068\u3048\u3070Kubernetes\u30af\u30e9\u30b9\u30bf\u306e)\u6700\u4e0b\u5c64\u30ce\u30fc\u30c9\u3067\u3059\u3002DNS\u306e\u4ed5\u7d44\u307f\u306e\u57fa\u672c\u6982\u5ff5\u306f\u6b21\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3059\u3002DNS\u30ea\u30be\u30eb\u30d0\u306f\u81ea\u5206\u304c\u77e5\u3089\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u5c0b\u306d\u3089\u308c\u308b\u3068\u3001\u305d\u308c\u3092DNS\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306b\u5c0b\u306d\u307e\u3059\u3002\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306f\u968e\u5c64\u306e\u6700\u4e0a\u4f4d\u30ce\u30fc\u30c9\u3067\u3001\u305d\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u30ea\u30be\u30eb\u30d0\u306b\u30cf\u30fc\u30c9\u30b3\u30fc\u30c9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306f\u8a72\u5f53\u3059\u308b\u30c8\u30c3\u30d7\u30ec\u30d9\u30eb\u30c9\u30e1\u30a4\u30f3(TLD)\u306eDNS\u30b5\u30fc\u30d0\u30fc\u306e\u30a2\u30c9\u30ec\u30b9\u30ea\u30b9\u30c8\u3092\u8fd4\u3057\u307e\u3059\u3002\u3053\u306eDNS\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u8a72\u5f53\u3059\u308bDNS\u30be\u30fc\u30f3(.com\u3001.net\u306a\u3069)\u3092\u53d7\u3051\u6301\u3061\u307e\u3059\u3002TLD\u30b5\u30fc\u30d0\u30fc\u306f\u968e\u5c64\u5185\u306e\u6b21\u306e\u4e0b\u4f4d\u30b5\u30fc\u30d0\u30fc\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u8fd4\u3057\u3001\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u3001\u3053\u308c\u304c\u884c\u308f\u308c\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_bngxjwnm97bb\"><\/a><strong>\u30af\u30e9\u30a6\u30c9\u5185\u306eDNS<\/strong><\/h4>\n<p>\u8fd1\u5e74\u3001\u30af\u30e9\u30a6\u30c9\u30b3\u30f3\u30d4\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u4eba\u6c17\u304c\u6025\u5897\u3057\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30a6\u30c9\u88fd\u54c1\u306f\u3001\u76f4\u611f\u7684\u3067\u306a\u3044\u65b9\u6cd5\u3067DNS\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30af\u30e9\u30a6\u30c9\u5185\u306e\u4eee\u60f3\u30de\u30b7\u30f3\u306e\u5834\u5408\u306f\u3001\u304b\u306a\u308a\u76f4\u89b3\u7684\u3067\u3059\u3002DNS\u30ea\u30be\u30eb\u30d0\u306f\u3001\u4eee\u60f3\u30de\u30b7\u30f3\u306e\u30aa\u30da\u30ec\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30b9\u30c6\u30e0\u306b\u3088\u3063\u3066\u6c7a\u307e\u308a\u307e\u3059\u3002Windows\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001Windows\u306bDNS\u30ea\u30be\u30eb\u30d0\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u307e\u3059\u3002Linux\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001Kubernetes\u306e\u3088\u3046\u306a\u4ed6\u306e\u30af\u30e9\u30a6\u30c9\u88fd\u54c1\u306e\u5834\u5408\u306f\u3069\u3046\u3067\u3057\u3087\u3046\u304b? \u5358\u7d14\u306a\u4eee\u60f3\u30de\u30b7\u30f3\u3068\u306f\u7570\u306a\u308a\u3001Kubernetes\u306fDNS\u30ea\u30be\u30eb\u30d0\u304c\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u306a\u3044\u30ab\u30b9\u30bf\u30e0\u4eee\u60f3\u30de\u30b7\u30f3\u3092\u30ce\u30fc\u30c9\u306b\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3055\u3089\u306b\u3001\u5404Kubernetes\u30af\u30e9\u30b9\u30bf\u306b\u306f\u3001\u7279\u5225\u306b\u30b3\u30f3\u30c6\u30ca\u5316\u3055\u308c\u305fDNS\u30ea\u30be\u30eb\u30d0\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u30af\u30e9\u30b9\u30bf\u5185\u306e\u3059\u3079\u3066\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u3053\u306e\u30b3\u30f3\u30c6\u30ca\u5316\u3055\u308c\u305fDNS\u30ea\u30be\u30eb\u30d0\u306bDNS\u8981\u6c42\u3092\u8ee2\u9001\u3057\u3001DNS\u30ea\u30be\u30eb\u30d0\u306f\u8981\u6c42\u3092\u51e6\u7406\u3057\u307e\u3059\u3002<\/p>\n<p>Kubernetes\u306e\u30d0\u30fc\u30b8\u30e7\u30f31.10\u307e\u3067\u306f\u3001DNS\u8981\u6c42\u3092\u51e6\u7406\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u8ee2\u9001\u3059\u308b\u305f\u3081\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30d1\u30c3\u30b1\u30fc\u30b8<em>kube-dns<\/em>\u304c\u3042\u308a\u307e\u3057\u305f\u3002<em>kube-dns<\/em>\u306e\u30b3\u30a2\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f<em>dnsmasq<\/em>\u3067\u3057\u305f\u3002<em>dnsmasq<\/em>\u306f\u3001DNS\u30b5\u30fc\u30d3\u30b9\u306b\u5c0f\u898f\u6a21\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3092\u63d0\u4f9b\u3059\u308b\u3001\u69cb\u6210\u3057\u3084\u3059\u3044\u8efd\u91cf\u306eDNS\u30d5\u30a9\u30ef\u30fc\u30c0\u3067\u3059\u3002\u305d\u306e\u5f8c\u3001Kubernetes\u306f<a href=\"https:\/\/github.com\/coredns\/coredns\">CoreDNS<\/a>\u306b\u79fb\u884c\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001<a href=\"https:\/\/golang.org\/\">Go<\/a>\u3067\u8a18\u8ff0\u3055\u308c\u305f\u30aa\u30fc\u30d7\u30f3\u30bd\u30fc\u30b9\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3067\u3059\u3002CoreDNS\u306f\u3001\u67d4\u8edf\u6027\u306e\u3042\u308b\u9ad8\u901f\u306aDNS\u30b5\u30fc\u30d0\u30fc\u3067\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_53nnpex87pem\"><\/a><strong>\u30ad\u30e3\u30c3\u30b7\u30e5<\/strong><\/h4>\n<p>\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u30c7\u30fc\u30bf\u3092\u683c\u7d0d\u3057\u3001\u305d\u306e\u30c7\u30fc\u30bf\u306b\u5bfe\u3059\u308b\u4ee5\u5f8c\u306e\u8981\u6c42\u3092\u8fc5\u901f\u306b\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u3001\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u307e\u305f\u306f\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001DNS\u30b5\u30fc\u30d0\u30fc\u306e\u975e\u5e38\u306b\u91cd\u8981\u306a\u6a5f\u80fd\u3067\u3059\u3002DNS\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u4ee5\u524d\u306b\u5909\u63db\u3057\u305f\u540d\u524d\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u683c\u7d0d\u3057\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8C\u304c<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u3066\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u304c<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u3092<span style=\"font-family: 'courier new', courier, monospace;\">93.184.216.34<\/span>\u306b\u89e3\u6c7a\u3057\u305f\u5834\u5408\u3001<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306e\u3053\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u4efb\u610f\u306e\u671f\u9593\u4fdd\u5b58\u3055\u308c\u3001\u6b21\u306eDNS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3053\u306e\u540d\u524d\u3092\u89e3\u6c7a\u3057\u3088\u3046\u3068\u3057\u3066\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u554f\u3044\u5408\u308f\u305b\u308b\u3068\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u8fc5\u901f\u306b\u56de\u7b54\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_ekdysamka29h\"><\/a><strong>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u3068\u306f\u4f55\u304b?<\/strong><\/h4>\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306fDNS\u30b5\u30fc\u30d0\u30fc\u4e0a\u3067\u884c\u308f\u308c\u308b\u653b\u6483\u30bf\u30a4\u30d7\u3067\u3001\u6700\u7d42\u7684\u306bDNS\u30b5\u30fc\u30d0\u30fc\u304c\u3001\u653b\u6483\u8005\u304c\u5236\u5fa1\u3059\u308bIP\u30a2\u30c9\u30ec\u30b9\u3092\u975e\u653b\u6483\u8005\u304c\u5236\u5fa1\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u306b\u4fdd\u5b58\u3059\u308b\u3053\u3068\u3067\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u653b\u6483\u8005\u304cDNS\u30b5\u30fc\u30d0\u30fc\u3092\u307e\u3093\u307e\u3068\u3060\u307e\u3057\u3066\u3001<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092<span style=\"font-family: 'courier new', courier, monospace;\">13.37.13.37<\/span>\u3068\u3057\u3066\u4fdd\u5b58\u3055\u305b\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u3067\u306f\u306a\u304f\u3001\u653b\u6483\u8005\u304c\u5236\u5fa1\u3059\u308b\u4e0d\u6b63\u306aIP\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002<\/p>\n<p>\u3053\u308c\u4ee5\u964d\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u305fIP\u30a2\u30c9\u30ec\u30b9\u304c\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3059\u308b\u307e\u3067\u3001<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u3092\u89e3\u6c7a\u3057\u3088\u3046\u3068\u3059\u308bDNS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3059\u3079\u3066\u3001\u653b\u6483\u8005\u306eWeb\u30b5\u30a4\u30c8\u306b\u300c\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u300d\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2><a id=\"post-110465-_2ld6z4rrvbh6\"><\/a>\u904e\u53bb\u306eDNS\u306e\u8106\u5f31\u6027<\/h2>\n<h4><a id=\"post-110465-_ll5o0dg4zzl6\"><\/a><strong>\u7de9\u548c\u7b56\u306a\u3057<\/strong><\/h4>\n<p>\u904e\u53bb20\u5e74\u9593\u3001\u591a\u304f\u306eDNS\u653b\u6483\u304c\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u306f\u3001\u6700\u3082\u3088\u304f\u77e5\u3089\u308c\u3066\u3044\u308b\u653b\u6483\u3067\u3042\u308bDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u3053\u306e\u653b\u6483\u306f\u3001DNS\u30b9\u30d7\u30fc\u30d5\u30a3\u30f3\u30b0\u3068\u3082\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306e\u4ed5\u7d44\u307f<\/p>\n<p>\u4e0a\u3067\u8ff0\u3079\u305f\u3088\u3046\u306b\u3001\u30ea\u30be\u30eb\u30d0\u304c\u30c9\u30e1\u30a4\u30f3\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u89e3\u6c7a\u3059\u308b\u306b\u306f\u3001\u591a\u5c11\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u901a\u5e38\u3001\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u306b\u3001\u8907\u6570\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u554f\u3044\u5408\u308f\u305b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u653b\u6483\u8005\u306f\u3053\u306e\u6642\u9593\u3092\u60aa\u7528\u3057\u3066\u3001\u507d\u306e\u56de\u7b54\u3092\u30ea\u30be\u30eb\u30d0\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u653b\u6483\u306f\u3001\u6b21\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u3001\u3059\u3079\u3066\u306e\u30b7\u30ca\u30ea\u30aa\u306b\u304a\u3044\u3066\u653b\u6483\u8005\u306f\u30ea\u30be\u30eb\u30d0\u306b\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30ea\u30be\u30eb\u30d0\u304c\u3001\u30ea\u30b9\u30cb\u30f3\u30b0\u30dd\u30fc\u30c8\u3092\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306b\u5bfe\u3057\u3066\u958b\u3044\u305f\u307e\u307e\u306b\u3057\u307e\u3059\u3002<\/li>\n<li>\u653b\u6483\u8005\u304c\u3001\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092\u306a\u3093\u3068\u304b\u3046\u307e\u304f\u5236\u5fa1\u3057\u307e\u3059\u3002<\/li>\n<li>\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306e\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u3001\u653b\u6483\u8005\u304c\u5236\u5fa1\u3059\u308bWeb\u30b5\u30a4\u30c8\u3092\u95b2\u89a7\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u305f\u3068\u3048\u3070\u3001\u653b\u6483\u8005\u304c\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306e1\u3064\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u306b\u4fb5\u5165\u3057\u3001\u30ed\u30fc\u30ab\u30eb\u30ea\u30be\u30eb\u30d0\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6c5a\u67d3\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u3068\u3057\u307e\u3059\u3002\u91cd\u8981\u306a\u306e\u306f\u3001\u3053\u306e\u653b\u6483\u3092\u3001ISP\u306e\u30ea\u30be\u30eb\u30d0\u306a\u3069\u3088\u308a\u91cd\u8981\u306a\u30ea\u30be\u30eb\u30d0\u306b\u3001\u307e\u3063\u305f\u304f\u540c\u3058\u65b9\u6cd5\u3067\u5b9f\u65bd\u3067\u304d\u308b\u3068\u3044\u3046\u70b9\u3067\u3059\u3002<\/p>\n<p>\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3001\u30c9\u30e1\u30a4\u30f3\u304c\u30ea\u30be\u30eb\u30d0\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u304b\u3089\u6d88\u3048\u3066\u3044\u308b\u305f\u3081\u3001\u4e0a\u3067\u8aac\u660e\u3057\u305f\u30d7\u30ed\u30bb\u30b9\u3092\u958b\u59cb\u3057\u3066\u3001\u30c9\u30e1\u30a4\u30f3\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u89e3\u6c7a\u3057\u307e\u3059\u3002\u305d\u306e\u9593\u3001\u653b\u6483\u8005\u306fDNS\u30b5\u30fc\u30d0\u30fc\u306e\u56de\u7b54\u306b\u898b\u305b\u304b\u3051\u3066\u3001\u507d\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u542b\u3080\u30a2\u30f3\u30b5\u30fc\u30d1\u30b1\u30c3\u30c8\u3092\u30ea\u30be\u30eb\u30d0\u306b\u9001\u4fe1\u3057\u307e\u3059\u3002\u3053\u308c\u304c\u653b\u6483\u306e\u57fa\u672c\u6982\u5ff5\u3067\u3059\u304c\u3001\u3044\u304f\u3064\u304b\u7de9\u548c\u7b56\u304c\u3042\u308a\u307e\u3059\u3002\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3084\u30bd\u30fc\u30b9 \u30dd\u30fc\u30c8 \u30e9\u30f3\u30c0\u30de\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306a\u3069\u3067\u3059\u3002<\/p>\n<p>DNS\u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID (TXID)\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u3092\u4f7f\u7528\u3057\u3066\u3001\u5404\u5fdc\u7b54\u3092\u6b63\u3057\u3044\u8981\u6c42\u3068\u4e00\u81f4\u3055\u305b\u3066\u3044\u307e\u3059\u3002\u653b\u6483\u8005\u306f\u6b63\u3057\u3044\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u6301\u3064\u5fdc\u7b54\u3092\u63d0\u4f9b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u3055\u3082\u306a\u3044\u3068DNS\u30b5\u30fc\u30d0\u30fc\u306f\u30d1\u30b1\u30c3\u30c8\u3092\u7834\u68c4\u3057\u307e\u3059\u3002\u4f55\u5e74\u3082\u524d\u306b\u958b\u767a\u3055\u308c\u305f\u6642\u70b9\u3067\u306f\u3001\u3053\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a5f\u80fd\u3067\u306f\u306a\u304f\u3001\u305f\u3060\u5358\u306b\u5fdc\u7b54\u3092\u8981\u6c42\u3068\u4e00\u81f4\u3055\u305b\u308b\u65b9\u6cd5\u3067\u3057\u305f\u3002DNS\u306e\u8106\u5f31\u6027\u304c\u767a\u898b\u3055\u308c\u308b\u524d\u3001DNS\u306f\u6607\u9806\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u3057\u3066\u4f7f\u7528\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u653b\u6483\u8005\u306f\u3001\u305d\u306e\u6570\u5024\u3092\u7c21\u5358\u306b\u63a8\u6e2c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<figure id=\"attachment_110472\" aria-describedby=\"caption-attachment-110472\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-110473 lozad\"  data-src=\"https:\/\/unit42-preview.paloaltonetworks.com\/wp-content\/uploads\/2020\/12\/word-image-226.png\" alt=\"DNS\u306e\u8106\u5f31\u6027\u304c\u3042\u308b\u3068\u3001DNS\u30d7\u30ed\u30c8\u30b3\u30eb\u306fDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483(\u3053\u3053\u3067\u8aac\u660e\u3057\u305f\u653b\u6483\u306a\u3069)\u3092\u53d7\u3051\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u653b\u6483\u8005\u306f\u30eb\u30fc\u30bf\u30fc\u306e\u30ea\u30be\u30eb\u30d0\u306b\u5e72\u6e09\u3057\u3066\u3001\u8981\u6c42\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u306e\u89e3\u6c7a\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u3001\u507d\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002 \" width=\"900\" height=\"404\" \/><figcaption id=\"caption-attachment-110472\" class=\"wp-caption-text\">\u56f32: DNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483<\/figcaption><\/figure>\n<p>\u653b\u6483\u8005\u306f\u30c9\u30e1\u30a4\u30f3\u3092\u8cfc\u5165\u3057\u3001\u81ea\u8eab\u304c\u5236\u5fa1\u3059\u308bDNS\u30b5\u30fc\u30d0\u30fc\u3092\u69cb\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u6b21\u306b\u3001\u653b\u6483\u8005\u306f\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306e\u30ea\u30be\u30eb\u30d0\u306b\u81ea\u8eab\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u3064\u3044\u3066\u5c0b\u306d\u307e\u3059\u3002\u30ed\u30fc\u30ab\u30eb\u30ea\u30be\u30eb\u30d0\u306f\u3001\u653b\u6483\u8005\u304c\u5236\u5fa1\u3059\u308bDNS\u30b5\u30fc\u30d0\u30fc\u3092\u77e5\u3063\u3066\u3044\u308bDNS\u30b5\u30fc\u30d0\u30fc\u306b\u5230\u9054\u3059\u308b\u307e\u3067\u3001\u8981\u6c42\u3092\u968e\u5c64\u578bDNS\u306e\u4e0a\u4f4d\u306b\u8ee2\u9001\u3057\u307e\u3059\u3002\u3053\u306e\u6642\u70b9\u3067\u3001\u5143\u306eDNS\u8981\u6c42(\u653b\u6483\u8005\u304c\u5185\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u304b\u3089\u767a\u884c\u3057\u305f)\u306f\u653b\u6483\u8005\u304c\u5236\u5fa1\u3059\u308bDNS\u30b5\u30fc\u30d0\u30fc\u306b\u5230\u9054\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u304c\u653b\u6483\u8005\u306b\u66b4\u9732\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u306f\u5148\u307b\u3069\u767a\u898b\u3057\u305f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u4f7f\u7528\u3057\u3066\u3001\u507d\u306e\u5fdc\u7b54\u304c\u53d7\u3051\u5165\u308c\u3089\u308c\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u5f97\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u653b\u6483\u8005\u306f\u8907\u6570\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3067\u8907\u6570\u306e\u507d\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3057\u3066\u3001\u3044\u305a\u308c\u304b\u304c\u6b63\u3057\u3044\u3053\u3068\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u653b\u6483\u8005\u306e\u6b8b\u308a\u306e\u4f5c\u696d\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u306eDNS\u30ea\u30be\u30eb\u30d0\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3059\u308bDNS\u8981\u6c42\u3092\u767a\u884c\u3057\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u4f7f\u7528\u3057\u3066\u76f4\u3061\u306b\u507d\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u30ed\u30fc\u30ab\u30eb\u30ea\u30be\u30eb\u30d0\u306f\u6b63\u3057\u3044\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306e\u5fdc\u7b54\u3092\u53d6\u5f97\u3057\u3001\u4ed6\u306f\u7834\u68c4\u3057\u3066\u3001\u30a2\u30c9\u30ec\u30b9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u307e\u3059\u3002\u3053\u306e\u3042\u3068\u4efb\u610f\u306e\u671f\u9593\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u30ed\u30fc\u30ab\u30eb\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u653b\u6483\u8005\u306eWeb\u30b5\u30a4\u30c8\u306b\u8ee2\u9001\u3055\u308c\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_ej1fyqx983jm\"><\/a><strong>\u65b0\u3057\u3044\u7de9\u548c\u7b56<\/strong><\/h4>\n<p>\u5b9f\u65bd\u3055\u308c\u305f\u660e\u78ba\u306a\u7de9\u548c\u7b56\u306f\u3001\u5404\u8981\u6c42\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u30e9\u30f3\u30c0\u30e0\u5316\u3059\u308b\u3053\u3068\u3067\u3057\u305f(\u6607\u9806\u306e\u30ab\u30a6\u30f3\u30bf\u3092\u4f7f\u7528\u3059\u308b\u306e\u3067\u306f\u306a\u304f)\u3002\u3053\u306e\u7de9\u548c\u7b56\u306b\u3088\u308a\u3001\u653b\u6483\u306e\u5b9f\u65bd\u304c\u975e\u5e38\u306b\u56f0\u96e3\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3069\u308c\u304f\u3089\u3044\u56f0\u96e3\u306b\u306a\u3063\u305f\u304b? MAX_SIZE_OF_QUERY_ID\u304c\u56f0\u96e3\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306f16\u30d3\u30c3\u30c8\u3067\u3042\u308b\u305f\u3081\u3001\u3053\u306e\u7de9\u548c\u7b56\u306b\u3088\u308a\u3001\u653b\u6483\u306f\u4ee5\u524d\u306e65,536\u500d\u56f0\u96e3\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u60aa\u304f\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u4e07\u5168\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h4><a id=\"post-110465-_5g74a8913yos\"><\/a><strong>2\u56de\u6226\u306b\u7a81\u5165!<\/strong><\/h4>\n<p>\u3053\u3046\u3057\u305f\u7de9\u548c\u7b56\u306f\u3001\u653b\u6483\u8005\u3092\u3057\u3070\u3089\u304f\u306e\u9593\u3001\u9060\u9000\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u304c\u3001\u6700\u7d42\u7684\u306b\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u306f\u8ffd\u3044\u3064\u304d\u307e\u3057\u305f\u300216\u30d3\u30c3\u30c8\u306e\u30e9\u30f3\u30c0\u30e0\u5316\u30ad\u30fc\u306f\u304b\u306a\u308a\u5927\u304d\u3044\u3067\u3059\u304c\u3001\u5341\u5206\u306b\u5927\u304d\u3044\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u6b21\u306e\u8a08\u7b97\u3067\u306f\u3001\u3044\u304f\u3064\u304b\u306e\u30c7\u30fc\u30bf\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u6a19\u6e96\u7684\u306aDNS\u5fdc\u7b54\u306e\u30b5\u30a4\u30ba: 100\u30d0\u30a4\u30c8= 800\u30d3\u30c3\u30c8<\/li>\n<li>\u653b\u6483\u8005\u306e\u5e2f\u57df\u5e45: 1\u30e1\u30ac<strong>\u30d3\u30c3\u30c8<\/strong>(Mb)\/\u79d2= 1,000,000\u30d3\u30c3\u30c8<\/li>\n<li>\u6b63\u5f53\u306a\u5fdc\u7b54\u304c\u30ea\u30be\u30eb\u30d0\u306b\u623b\u308b\u306e\u306b\u304b\u304b\u308b\u6642\u9593: 2\u79d2<\/li>\n<\/ul>\n<p>(2\u79d2\u306b\u95a2\u3059\u308b\u6ce8\u8a18: \u73fe\u4ee3\u306e\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u63a5\u7d9a\u3067\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u306a\u3044\u30c9\u30e1\u30a4\u30f3\u3067\u3042\u3063\u3066\u3082\u3001\u9593\u9055\u3044\u306a\u304f2\u79d2\u672a\u6e80\u3067DNS\u8981\u6c42\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u306e\u4f8b\u3067\u306f\u5f85\u3061\u6642\u9593\u3092\u8a2d\u5b9a\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u3001\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u901f\u5ea6\u3082\u904e\u53bb\u306e\u3082\u306e(1 Mb\/\u79d2)\u3092\u9078\u629e\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u4f7f\u7528\u3067\u304d\u308b\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306f65,536\u3042\u308a\u3001\u653b\u6483\u3092\u6210\u529f\u3055\u305b\u308b\u306e\u306b\u5fc5\u8981\u306a\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u6301\u3064\u5fdc\u7b54\u3092\u9001\u4fe1\u3059\u308b\u305f\u3081\u306b\u30012\u79d2\u306e\u6642\u9593\u304c\u3042\u308a\u307e\u3059\u3002\u653b\u6483\u3054\u3068\u306e\u6210\u529f\u7387\u3092\u8a08\u7b97\u3059\u308b\u306b\u306f\u3001\u30ea\u30be\u30eb\u30d0\u306b\u5b9f\u969b\u306e\u6b63\u5f53\u306a\u5fdc\u7b54\u304c\u5230\u9054\u3059\u308b\u524d\u306b\u3001\u653b\u6483\u8005\u304c\u767a\u4fe1\u3067\u304d\u308b\u5fdc\u7b54\u30d1\u30b1\u30c3\u30c8\u306e\u6570\u3092\u898b\u3064\u3051\u51fa\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u7c21\u5358\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\u5e2f\u57df\u5e45\u3092\u30d1\u30b1\u30c3\u30c8\u306e\u30b5\u30a4\u30ba\u3067\u5272\u3063\u305f\u3082\u306e\u306b\u6642\u9593\u3092\u639b\u3051\u307e\u3059\u3002<\/p>\n<p>\u5e2f\u57df\u5e45\u304c1 Mb\/\u79d2\u306e\u5834\u5408\u3001\u653b\u6483\u8005\u306f1\u79d2\u306b\u6700\u59271,000,000\/800 = 1,250\u306e\u5fdc\u7b54\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3067\u304d\u307e\u3059\u3002\u653b\u6483\u8005\u304c\u6301\u3064\u6642\u9593\u306f2\u79d2\u3067\u3042\u308b\u305f\u3081\u30012,500\u306e\u5fdc\u7b54\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3067\u304d\u307e\u3059\u3002\u5e2f\u57df\u5e45\u304c1 Mb\/\u79d2\u3067\u6210\u529f\u7387\u304c50%\u4ee5\u4e0a\u306e\u5834\u5408\u3001\u898b\u8fbc\u307f\u306e\u3042\u308b\u653b\u6483\u3092\u5b9f\u65bd\u3059\u308b\u306e\u306b\u5fc5\u8981\u306a\u8a66\u884c\u56de\u6570\u306f\u7d0418\u56de\u3067\u3059\u3002<\/p>\n<p>(\u8a08\u7b97\u306e\u8a73\u7d30\u306f\u3001<a href=\"https:\/\/www.wolframalpha.com\/input\/?i=1-%281-%28%281000000%2F800%29*2%29%2F2%5E16%29%5Ex%3E0.5\">\u3053\u3053<\/a>\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u30021,000,000\u306f\u30011 Mb\/\u79d2\u63a5\u7d9a\u30671\u79d2\u9593\u306b\u9001\u4fe1\u3067\u304d\u308b\u30d3\u30c3\u30c8\u6570\u3067\u3059\u3002\u3053\u306e\u30d3\u30c3\u30c8\u6570\u3092800\u3067\u5272\u3063\u305f\u3082\u306e\u304cDNS\u5fdc\u7b54\u306e\u30b5\u30a4\u30ba\u3067\u3001\u3053\u306e\u5024\u306b\u3088\u308a1\u79d2\u9593\u306b\u9001\u4fe1\u3067\u304d\u308b\u5fdc\u7b54\u6570\u304c\u5f97\u3089\u308c\u307e\u3059\u3002\u6642\u9593\u304c2\u79d2\u3067\u3042\u308b\u305f\u3081\u3001\u5fdc\u7b54\u6570\u306b2\u3092\u639b\u3051\u307e\u3059\u3002\u3053\u306e\u5024\u30922\u306e16\u4e57\u3067\u5272\u3063\u305f\u3082\u306e\u304c\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30b5\u30a4\u30ba\u3067\u3001\u3053\u308c\u304c1\u56de\u306e\u653b\u6483\u306e<em>\u6210\u529f\u7387<\/em>\u3067\u3059\u3002\u653b\u6483\u3092\u6210\u529f\u3055\u305b\u308b\u306b\u306f\u3001<em>x\u56de\u8a66\u884c\u3057\u3001\u305d\u306e\u3046\u3061\u306e1\u56de\u304c\u6210\u529f\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/em>\u3002<em>x<\/em>\u56de\u306e\u8a66\u884c\u3092\u300c\u5b9f\u9a13\u300d\u3068\u547c\u3073\u3001\u305d\u306e\u5b9f\u9a13\u304b\u3089\u5f97\u3089\u308c\u308b\u3059\u3079\u3066\u306e\u7d50\u679c\u3092<em>\u6a19\u672c\u7a7a\u9593<\/em>(\u03a9)\u3068\u547c\u3073\u307e\u3059\u3002\u6a19\u672c\u7a7a\u9593\u3067\u4f55\u304b\u304c\u51fa\u308b\u78ba\u7387\u306f\u9593\u9055\u3044\u306a\u304f100%\u3067\u3059(\u3053\u308c\u306f\u3001\u5f0f\u306e\u5916\u50741\u3067\u3059)\u3002\u898b\u8fbc\u307f\u306e\u3042\u308b\u653b\u6483\u306e\u78ba\u7387\u3092\u6c42\u3081\u308b\u306b\u306f\u3001\u6a19\u672c\u7a7a\u9593\u5168\u4f53\u304b\u3089\u300c1\u56de\u4ee5\u4e0a\u306e\u653b\u6483\u3067\u6210\u529f\u3059\u308b\u300d\u4ee5\u5916\u306e\u3082\u306e\u3001\u3064\u307e\u308a<em>x\u56de\u306e\u8a66\u884c\u3059\u3079\u3066\u306b\u5931\u6557\u3059\u308b<\/em>\u3092\u5f15\u304f\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u30021\u56de\u306e\u8a66\u884c\u3067\u306e\u5931\u6557\u306f\u300c\u3059\u3079\u3066(1)\u304b\u30891\u56de\u306e\u8a66\u884c\u3067\u306e\u6210\u529f\u3092\u5f15\u3044\u305f\u3082\u306e\u300d\u3067\u3042\u308a\u30011\u304b\u3089\u6210\u529f\u7387\u3092\u5f15\u3044\u305f\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002\u3067\u306f\u3001Wolfram Alpha\u3067\u3001\u3053\u306e\u5f0f\u30670.5 (50%)\u3088\u308a\u5927\u304d\u3044\u5024\u304c\u5f97\u3089\u308c\u308b<em>x<\/em>\u3092\u6c42\u3081\u3066\u307f\u307e\u3057\u3087\u3046\u3002)<\/p>\n<p>\u8a00\u3044\u63db\u3048\u308c\u3070\u3001\u3053\u306e\u7de9\u548c\u7b56\u306e\u5b9f\u65bd<strong>\u5f8c<\/strong>\u3001\u5e2f\u57df\u5e451 Mb\/\u79d2\u306e\u653b\u6483\u8005\u306f\u3001\u305f\u3063\u305f18\u56de\u306e\u8a66\u884c\u3067\u300150%\u3092\u8d85\u3048\u308b\u6210\u529f\u7387\u3092\u9054\u6210\u3067\u304d\u307e\u3057\u305f\u3002\u3053\u306e\u3088\u3046\u306b\u3001\u6614\u306f\u3053\u306e\u7834\u58ca\u7684\u306a\u653b\u6483\u3092\u3044\u3068\u3082\u7c21\u5358\u306b\u5b9f\u65bd\u3067\u304d\u305f\u306e\u3067\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_sqoovpwg74cc\"><\/a><strong>\u3055\u3089\u306a\u308b\u7de9\u548c\u7b56<\/strong><\/h4>\n<p>\u6700\u521d\u306f\u3001\u3053\u306e\u3088\u3046\u306a\u5f31\u3044\u7de9\u548c\u7b56\u304c\u9078\u629e\u3055\u308c\u305f\u3053\u3068\u3092\u610f\u5916\u306b\u601d\u3046\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001DNS\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u5b8c\u5168\u306b\u518d\u69cb\u7bc9\u3059\u308b\u3053\u3068\u306f\u4e0d\u53ef\u80fd\u3067\u3042\u3063\u305f\u3053\u3068\u3092\u601d\u3044\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8\u3092\u7834\u58ca\u3057\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u7d44\u307f\u8fbc\u307f\u306e\u30ea\u30be\u30eb\u30d0\u3092\u6301\u3064\u30c7\u30d0\u30a4\u30b9\u3060\u3051\u3092\u8003\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u308c\u3089\u306e\u30c7\u30d0\u30a4\u30b9\u304c\u5b8c\u5168\u306b\u52d5\u4f5c\u3092\u505c\u6b62\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3057\u305f\u3002\u3057\u304b\u3057\u3001\u305d\u308c\u4ee5\u4e0a\u306e\u4f55\u304b\u3092\u5b9f\u65bd\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e0a\u8ff0\u3057\u305f\u3088\u3046\u306b\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306b\u3088\u308b\u7de9\u548c\u7b56\u306f\u8106\u5f31\u3067\u3057\u305f\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u540c\u3058\u7de9\u548c\u7b56\u3092\u3001\u4eca\u5ea6\u306f\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u3067\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002DNS\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3001\u30ea\u30be\u30eb\u30d0\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306eDNS\u8981\u6c42\u306f\u3001\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u304b\u3089\u9001\u4fe1\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u7de9\u548c\u7b56\u306e\u524d\u307e\u3067\u3001\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u306f\u30e9\u30f3\u30c0\u30e0\u5316\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n<p>\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u306f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u540c\u305816\u30d3\u30c3\u30c8\u306e\u6570\u5024\u3067\u3001\u305d\u306e\u6a5f\u80fd\u306e\u305f\u3081\u306b\u306e\u307f\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u30ea\u30be\u30eb\u30d0\u304c\u30dd\u30fc\u30c810650\u3092\u4f7f\u7528\u3057\u3088\u3046\u3068\u3057\u3066\u3001\u3053\u306e\u30dd\u30fc\u30c8\u304c\u524d\u306e\u8981\u6c42\u3067\u4f7f\u7528\u4e2d\u306e\u5834\u5408\u3001\u30ea\u30be\u30eb\u30d0\u306f10651\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3080\u308d\u3093\u3001\u4ed6\u306e\u7528\u9014\u5411\u3051\u306e\u30dd\u30fc\u30c8\u3082\u3042\u308b\u305f\u3081\u300116\u30d3\u30c3\u30c8\u3059\u3079\u3066\u3092\u5229\u7528\u3067\u304d\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u3068\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001DNS\u901a\u4fe1\u306e<strong>\u30ad\u30fc<\/strong>(32\u30d3\u30c3\u30c8\u30ad\u30fc)\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u3053\u308c\u304b\u3089\u8aac\u660e\u3059\u308b\u653b\u6483\u306b\u304a\u3044\u3066\u91cd\u8981\u3067\u3042\u308b\u305f\u3081\u3001\u899a\u3048\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u3053\u308c\u3089\u306e\u8ffd\u52a0\u306e16\u30d3\u30c3\u30c8\u306b\u3088\u308a\u3001\u653b\u6483\u306e\u6210\u529f\u7387\u304c\u8457\u3057\u304f\u6e1b\u5c11\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u4ee5\u524d\u306f\u3001\u5e2f\u57df\u5e451 Mb\/\u79d2\u3067\u306e\u6210\u529f\u7387\u306f3.8% (<a href=\"https:\/\/www.wolframalpha.com\/input\/?i=%28%281000000%2F800%29*2%29%2F2%5E16+in+percent\">Wolfram Alpha\u3067\u306e\u8a08\u7b97<\/a>\u3092\u53c2\u7167)\u3067\u3057\u305f\u3002\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u306b\u3088\u308b\u7de9\u548c\u7b56\u3092\u5b9f\u65bd\u3057\u305f\u5834\u5408\u3001\u5b9f\u65bd\u524d\u3068\u540c\u3058\u30c7\u30fc\u30bf\u3067\u653b\u6483\u304c\u6210\u529f\u3059\u308b\u78ba\u7387\u306f0.00005821%\u3067\u3059\u3002\u5b9f\u65bd\u524d\u3068\u540c\u3058\u6210\u529f\u7387\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u8a66\u884c\u56de\u6570\u306f1,190,820\u56de\u3067\u3059\u3002\u653b\u6483\u306e\u6210\u529f\u306f\u78ba\u5b9f\u3067\u306f\u306a\u304f\u306a\u308a\u3001\u4e8b\u5b9f\u3001\u30bd\u30fc\u30b9 \u30dd\u30fc\u30c8 \u30e9\u30f3\u30c0\u30de\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u307b\u3068\u3093\u3069\u306eDNS\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u306f\u7d42\u6b62\u7b26\u3092\u6253\u305f\u308c\u307e\u3057\u305f\u3002<\/p>\n<h2><a id=\"post-110465-_guojbuq7qy12\"><\/a>\u3088\u308a\u9ad8\u5ea6\u306a\u8106\u5f31\u6027<\/h2>\n<p>\u3053\u308c\u307e\u3067\u306f\u3001\u4e3b\u3068\u3057\u3066\u5358\u4e00\u306eDNS\u30ec\u30b3\u30fc\u30c9\u3001\"<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span> is at <span style=\"font-family: 'courier new', courier, monospace;\">93.184.216.34<\/span>\" (A\u30ec\u30b3\u30fc\u30c9\u3068\u3082\u547c\u3070\u308c\u307e\u3059)\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u30eb\u30fc\u30bf\u30fc\u3084Kubernetes\u30af\u30e9\u30b9\u30bf\u306a\u3069\u3001\u6a19\u7684\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3067\u30ec\u30b3\u30fc\u30c9\u3092\u6c5a\u67d3\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u306f\u30011\u3064\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6c5a\u67d3\u3059\u308b\u96e3\u3057\u3044\u653b\u6483\u306b\u61f8\u547d\u306b\u53d6\u308a\u7d44\u3093\u3067\u304d\u307e\u3057\u305f\u304c\u3001\u3082\u3063\u3068\u3046\u307e\u304f\u3084\u308c\u305f\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<p>2008\u5e74\u306b\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7814\u7a76\u8005\u306eDan Kaminsky\u304c\u3088\u308a\u3088\u3044\u30a2\u30d7\u30ed\u30fc\u30c1\u3092<a href=\"https:\/\/www.blackhat.com\/html\/webinars\/kaminsky-DNS.html\">\u767a\u898b<\/a>\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001\u672c\u30d6\u30ed\u30b0\u3067\u3053\u308c\u307e\u3067\u8aac\u660e\u3057\u305f\u30a2\u30d7\u30ed\u30fc\u30c1\u3088\u308a\u3082\u3001\u305a\u3063\u3068\u52b9\u679c\u7684\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3067\u3059\u3002\u3053\u306e\u8106\u5f31\u6027\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30b3\u30df\u30e5\u30cb\u30c6\u30a3\u306b\u5927\u9a12\u52d5\u3092\u5dfb\u304d\u8d77\u3053\u3057\u307e\u3057\u305f\u3002\u4e00\u822c\u7684\u306a\u5b9f\u884c\u65b9\u6cd5\u306f\u3001\u3053\u308c\u307e\u3067\u8aac\u660e\u3057\u305f\u65b9\u6cd5\u3068\u307b\u307c\u540c\u3058\u3067\u3042\u308b\u305f\u3081\u3001\u5f15\u304d\u7d9a\u304d\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u3092\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6210\u529f\u7387\u306f\u307b\u307c\u540c\u3058\u3067\u3059\u304c\u3001Kaminsky\u306e\u65b9\u6cd5\u3067\u306f\u3001\u6210\u529f\u3057\u305f\u5834\u5408\u306b\u3001\u3088\u308a\u591a\u304f\u306e\u30ec\u30b3\u30fc\u30c9\u3092\u6c5a\u67d3\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<h4><a id=\"post-110465-_4zmh7uojw99h\"><\/a><strong>NS\u30ec\u30b3\u30fc\u30c9<\/strong><\/h4>\n<p>\u540d\u524d\u304c\u793a\u3059\u3088\u3046\u306b\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc(NS)\u30ec\u30b3\u30fc\u30c9\u306f\u3001\u3069\u306eDNS\u30b5\u30fc\u30d0\u30fc\u304c\u30c9\u30e1\u30a4\u30f3\u306e<strong>\u6a29\u5a01<\/strong>\u3067\u3042\u308b\u304b\u3001\u3064\u307e\u308a\u3001\u3069\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u30c9\u30e1\u30a4\u30f3\u306e\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u304c\u542b\u307e\u308c\u308b\u304b\u3092\u793a\u3059DNS\u30ec\u30b3\u30fc\u30c9\u3067\u3059\u3002\u4e0a\u8a18\u306e\u4f8b\u3067\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">example.com<\/span>\u306eNS\u30ec\u30b3\u30fc\u30c9\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u3001email.example.com\u304a\u3088\u3073<span style=\"font-family: 'courier new', courier, monospace;\">?.example.com<\/span>\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u4fdd\u6301\u3059\u308b\u30b5\u30fc\u30d0\u30fc\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306e\u653b\u6483\u8005\u306e\u76ee\u6a19\u306f\u3001\u6a19\u7684\u306e\u30ea\u30be\u30eb\u30d0\u3092\u6c5a\u67d3\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3064\u307e\u308a\u3001\u6a19\u7684\u304c<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u3001<span style=\"font-family: 'courier new', courier, monospace;\">email.example.com<\/span>\u307e\u305f\u306f<span style=\"font-family: 'courier new', courier, monospace;\">?.example.com<\/span>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3088\u3046\u3068\u3057\u305f\u3068\u304d\u306b\u3001\u30ea\u30be\u30eb\u30d0\u306b\u8981\u6c42\u3092<span style=\"font-family: 'courier new', courier, monospace;\">example.com<\/span>\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3067\u306f\u306a\u304f<strong>\u653b\u6483\u8005<\/strong>\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u8ee2\u9001\u3055\u305b\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u65b9\u6cd5\u306b\u3088\u3063\u3066\u3001\u653b\u6483\u8005\u306f\u4ee5\u524d\u306e\u3088\u3046\u306b<span style=\"font-family: 'courier new', courier, monospace;\">www<\/span>\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3060\u3051\u3067\u306f\u306a\u304f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">example.com<\/span>\u306e\u3059\u3079\u3066\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3078\u306e\u3059\u3079\u3066\u306e\u30a2\u30af\u30bb\u30b9\u3092\u5236\u5fa1\u3057\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_94yw4ka9tg1b\"><\/a><strong>\u3057\u304b\u3057\u3001\u3069\u3046\u3084\u3063\u3066?<\/strong><\/h4>\n<p>\u610f\u5916\u306b\u3082\u3001\u3053\u306e\u653b\u6483\u306f\u672c\u30d6\u30ed\u30b0\u3067\u8aac\u660e\u3057\u305f\u524d\u306e\u653b\u6483\u3068\u3088\u304f\u4f3c\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u653b\u6483\u8005\u306f\u30ea\u30be\u30eb\u30d0\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092A\u30ec\u30b3\u30fc\u30c9\u3067\u6c5a\u67d3\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001NS\u30ec\u30b3\u30fc\u30c9\u3067\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6c5a\u67d3\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u306f\u307e\u305a\u3001\u6c5a\u67d3\u3057\u3088\u3046\u3068\u3059\u308b\u30c9\u30e1\u30a4\u30f3\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3092\u69cb\u6210\u3057\u307e\u3059\u3002\u8ab0\u304b\u304c\u81ea\u5206\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3092\u4efb\u610f\u306e\u30c9\u30e1\u30a4\u30f3\u306e\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\u3068\u3057\u3066\u69cb\u6210\u3059\u308b\u3053\u3068\u3092\u963b\u3080\u3082\u306e\u306f\u3001\u4f55\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u305f\u3060\u3057\u3001\u4ed6\u306e\u30b5\u30fc\u30d0\u30fc\u304c\u6a29\u5a01\u30b5\u30fc\u30d0\u30fc\u3092\u6307\u3059\u3053\u3068\u306f\u306a\u3044\u305f\u3081\u3001\u3053\u308c\u306f\u901a\u5e38\u306f\u7121\u610f\u5473\u3067\u3059\u3002<\/p>\n<figure id=\"attachment_110474\" aria-describedby=\"caption-attachment-110474\" style=\"width: 900px\" class=\"wp-caption aligncenter\"><img  class=\"wp-image-110475 lozad\"  data-src=\"https:\/\/unit42-preview.paloaltonetworks.com\/wp-content\/uploads\/2020\/12\/word-image-227.png\" alt=\"\u3088\u308a\u9ad8\u5ea6\u306aDNS\u306e\u8106\u5f31\u6027\u306b\u3088\u3063\u3066\u3001\u3053\u3053\u306b\u56f3\u793a\u3059\u308b\u3088\u3046\u306b\u3001\u5b8c\u5168\u306a\u30be\u30fc\u30f3\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u3078\u306e\u9053\u304c\u958b\u3051\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u653b\u6483\u8005\u306f\u5358\u4e00\u306e\u30ec\u30b3\u30fc\u30c9\u3067\u306f\u306a\u304fNS\u30ec\u30b3\u30fc\u30c9\u3092\u6c5a\u67d3\u3057\u3001\u5f71\u97ff\u306f\u3088\u308a\u5927\u304d\u3044\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002 \" width=\"900\" height=\"311\" \/><figcaption id=\"caption-attachment-110474\" class=\"wp-caption-text\">\u56f33: \u5b8c\u5168\u306a\u30be\u30fc\u30f3\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483<\/figcaption><\/figure>\n<p>\u6b21\u306b\u3001\u653b\u6483\u8005\u306f\u6c5a\u67d3\u3059\u308b\u30be\u30fc\u30f3\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u306b\u5bfe\u3059\u308bDNS\u8981\u6c42\u3092\u767a\u884c\u3057\u307e\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u306a\u3044\u3001\u3057\u305f\u304c\u3063\u3066\u30ea\u30be\u30eb\u30d0\u304c\u8981\u6c42\u3092\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306b\u8ee2\u9001\u3059\u308b\u3053\u3068\u304c\u5206\u304b\u3063\u3066\u3044\u308b\u30c9\u30e1\u30a4\u30f3\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u308c\u3060\u3051\u3067\u306a\u304f\u3001\u3053\u306e\u4f8b\u3067\u306f\u3001\u305d\u306e\u30c9\u30e1\u30a4\u30f3\u306eNS\u30ec\u30b3\u30fc\u30c9\u3001<span style=\"font-family: 'courier new', courier, monospace;\">example.com<\/span>\u306e\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3082\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u5fc5\u8981\u3067\u3059\u3002\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u305f\u5834\u5408\u3001\u30ea\u30be\u30eb\u30d0\u306f\u8981\u6c42\u3092\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306b\u3059\u3089\u8ee2\u9001\u305b\u305a\u306b\u3001\u305d\u306e\u6a29\u5a01\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u76f4\u63a5\u8ee2\u9001\u3057\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u8005\u304c\u3001\u6a19\u7684\u306e\u30ea\u30be\u30eb\u30d0\u306b\u8981\u6c42\u3092\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u3078\u3068\u8ee2\u9001\u3055\u305b\u305f\u5f8c\u3001\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306f\u901a\u5e38\u3001\u300c\u7b54\u3048\u306f\u308f\u304b\u308a\u307e\u305b\u3093\u3002\u5411\u3053\u3046\u306b\u3042\u308b\u30b5\u30fc\u30d0\u30fc\u306b\u5c0b\u306d\u3066\u304f\u3060\u3055\u3044\u3002\u30b5\u30fc\u30d0\u30fc\u306eIP\u30a2\u30c9\u30ec\u30b9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002\u300d\u3068\u3044\u3046\u3088\u3046\u306a\u5185\u5bb9\u306eNS\u30ec\u30b3\u30fc\u30c9\u3067\u5fdc\u7b54\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u304c\u3001\u96e3\u3057\u3044\u90e8\u5206\u3067\u3059\u3002\u653b\u6483\u3092\u6210\u529f\u3055\u305b\u308b\u306b\u306f\u3001\u653b\u6483\u8005\u306f\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u3092\u3057\u306e\u304e\u3001\u30eb\u30fc\u30c8\u30b5\u30fc\u30d0\u30fc\u306e\u5fdc\u7b54\u304c\u9001\u4fe1\u3055\u308c\u308b\u524d\u306b\u3001\u6c5a\u67d3\u3055\u308c\u305f\u5fdc\u7b54\u3092\u914d\u4fe1\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u308c\u306b\u306f\u3001\u76ee\u7684\u306e\u30c9\u30e1\u30a4\u30f3\u306eNS\u30ec\u30b3\u30fc\u30c9\u3092\u542b\u3080\u5927\u5bb9\u91cf\u306e\u5fdc\u7b54\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002\u653b\u6483\u8005\u304c\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID (\u305d\u3057\u3066\u3001\u6050\u3089\u304f\u30bd\u30fc\u30b9\u30dd\u30fc\u30c8\u3082)\u3092\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3092\u5fd8\u308c\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>NS\u56de\u7b54\u306b\u306f\u305d\u308c\u305e\u308c\u3001\u300c\u63a5\u7740\u5264\u300d\u30ec\u30b3\u30fc\u30c9\u304c\u542b\u307e\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306e\u5b9f\u969b\u306eIP\u30a2\u30c9\u30ec\u30b9\u3067\u3059\u3002\u4ed6\u306e\u65b9\u6cd5\u3067\u3042\u3063\u305f\u306a\u3089\u3001\u8981\u6c42\u5143\u30b5\u30fc\u30d0\u30fc\u306f\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u3092\u3069\u3053\u3067\u898b\u3064\u3051\u305f\u3089\u3088\u3044\u304b\u308f\u304b\u3089\u306a\u3044\u3067\u3057\u3087\u3046\u3002\u30ea\u30be\u30eb\u30d0\u306f\u3053\u306e\u63a5\u7740\u5264\u30ec\u30b3\u30fc\u30c9\u3092\u53d7\u4fe1\u3057\u3066\u30ad\u30e3\u30c3\u30b7\u30e5\u3057\u3001\u63a5\u7740\u5264\u304c\u6307\u3059\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u554f\u3044\u5408\u308f\u305b\u3066\u3001\u8981\u6c42\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002<\/p>\n<p>\u653b\u6483\u304c\u6210\u529f\u3057\u305f\u5834\u5408\u3001\u4ee5\u5f8c\u3001\u30ea\u30be\u30eb\u30d0\u306b\u9001\u4fe1\u3055\u308c\u305f\u3001\u6c5a\u67d3\u3055\u308c\u305f\u30c9\u30e1\u30a4\u30f3\u30be\u30fc\u30f3\u4e0b\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3055\u308c\u3066\u3044\u306a\u3044\u30c9\u30e1\u30a4\u30f3(<span style=\"font-family: 'courier new', courier, monospace;\">www.example.com<\/span>\u306e<span style=\"font-family: 'courier new', courier, monospace;\">example.com<\/span>)\u306e\u8981\u6c42\u306f\u3001\u653b\u6483\u8005\u306e\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc\u306b\u5230\u9054\u3057\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_6ciyutgvv5sa\"><\/a><strong>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/strong><\/h4>\n<p>\u3053\u306e\u9ad8\u5ea6\u306a\u653b\u6483\u3067\u306f\u3001\u653b\u6483\u8005\u306f\u540c\u6642\u306b\u591a\u6570\u306e\u30c9\u30e1\u30a4\u30f3\u3092\u6c5a\u67d3\u3067\u304d\u307e\u3059\u3002\u7406\u8ad6\u7684\u306b\u306f\u3001\u653b\u6483\u8005\u306f<span style=\"font-family: 'courier new', courier, monospace;\">.com<\/span>\u30be\u30fc\u30f3\u5168\u4f53\u3092\u6c5a\u67d3\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><span style=\"font-family: 'courier new', courier, monospace;\">.com<\/span>\u306e\u3088\u3046\u306a\u5927\u304d\u3044\u30be\u30fc\u30f3\u3092\u6c5a\u67d3\u3059\u308b\u306e\u306f\u56f0\u96e3\u3067\u3059\u304c\u3001\u653b\u6483\u8005\u304c\u5b9f\u969b\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\u5168\u4f53\u3092\u6c5a\u67d3\u3057\u3088\u3046\u3068\u3057\u305f\u4e8b\u4f8b\u3082\u3042\u308a\u307e\u3059\u3002\u6b21\u306e\u3088\u3046\u306a\u4f8b\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>2015\u5e741\u670826\u65e5\u3001\u3042\u308b\u30cf\u30c3\u30ab\u30fc\u96c6\u56e3\u304c<a href=\"https:\/\/www.bbc.com\/news\/world-asia-30978299\">\u30de\u30ec\u30fc\u30b7\u30a2\u822a\u7a7a\u306eWeb\u30b5\u30a4\u30c8\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u30e6\u30fc\u30b6\u30fc\u3092\u3001\u60aa\u610f\u306e\u3042\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3059\u308b\u5225\u306e\u30b5\u30a4\u30c8\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8<\/a>\u3057\u307e\u3057\u305f\u3002<\/li>\n<li>2011\u5e7411\u67087\u65e5\u3001\u30cf\u30c3\u30ab\u30fc\u304c<a href=\"https:\/\/securelist.com\/massive-dns-poisoning-attacks-in-brazil\/31628\/\">\u30a4\u30f3\u30bf\u30fc\u30cd\u30c3\u30c8 \u30b5\u30fc\u30d3\u30b9 \u30d7\u30ed\u30d0\u30a4\u30c0(ISP)\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u5168\u4f53\u3092\u6c5a\u67d3<\/a>\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u8981\u6c42\u3057\u305f\u30b5\u30a4\u30c8\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3059\u308b\u524d\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u3092\u30de\u30eb\u30a6\u30a7\u30a2 \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb \u30b5\u30a4\u30c8\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u307e\u3057\u305f\u3002<\/li>\n<li>2009\u5e7412\u670818\u65e5\u3001Twitter\u304c\u4e00\u6642\u7684\u306b(\u7d041\u6642\u9593)<a href=\"https:\/\/www.theregister.com\/2009\/12\/18\/dns_twitter_hijack\/\">DNS\u30cf\u30a4\u30b8\u30e3\u30c3\u30af\u653b\u6483<\/a>\u306e\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3057\u305f\u3002<\/li>\n<\/ul>\n<p>\u3053\u3046\u3057\u305f\u653b\u6483\u304c\u3001\u6bce\u5e74\u4f55\u767e\u3082\u5b9f\u65bd\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h4><a id=\"post-110465-_yz4gt871zgw8\"><\/a><strong>\u7de9\u548c\u7b56<\/strong><\/h4>\n<p>\u65b0\u3057\u3044\u7de9\u548c\u7b56\u306f\u884c\u308f\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u3059\u3067\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u305f\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u30dd\u30fc\u30c8\u30e9\u30f3\u30c0\u30de\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u308b\u7de9\u548c\u7b56\u306b\u3088\u308a\u3001\u3053\u306e\u653b\u6483\u306f\u3059\u3067\u306b\u307b\u307c\u5b9f\u65bd\u4e0d\u80fd\u3067\u3042\u3063\u305f\u305f\u3081\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u653b\u6483\u8005\u304c\u300c\u901a\u5e38\u306e\u300d\u5358\u4e00\u306eA\u30ec\u30b3\u30fc\u30c9\u653b\u6483\u3067\u306f\u306a\u304f\u3001\u3053\u306e\u653b\u6483\u3092\u4f7f\u7528\u3057\u3066\u3053\u308c\u3089\u306e\u7de9\u548c\u7b56\u3092\u4e57\u308a\u8d8a\u3048\u3088\u3046\u3068\u3057\u305f\u5834\u5408\u3001\u653b\u6483\u306f\u3088\u308a\u6fc0\u3057\u3044\u3082\u306e\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u524d\u3068\u540c\u3058\u3088\u3046\u306b\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3068\u30dd\u30fc\u30c8\u30e9\u30f3\u30c0\u30de\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u3092\u4e00\u7dd2\u306b\u4f7f\u7528\u3057\u3066\u3001\u653b\u6483\u8005\u304c\u63a8\u6e2c\u3067\u304d\u306a\u3044\u304f\u3089\u3044\u5341\u5206\u306b\u5927\u304d\u3044\u30ad\u30fc\u3092\u4f5c\u6210\u3057\u3066\u3001\u653b\u6483\u3092\u7de9\u548c\u3057\u307e\u3059\u3002<\/p>\n<h2><a id=\"post-110465-_fhrg0yfuwszi\"><\/a>\u6700\u65b0\u306e\u8106\u5f31\u6027<\/h2>\n<p>DNS\u30d7\u30ed\u30c8\u30b3\u30eb\u304c\u5b89\u5168\u3067\u3042\u308b\u3068\u8003\u3048\u3089\u308c\u308b\u5834\u5408\u3067\u3082\u3001\u958b\u767a\u8005\u306fDNS\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u5b89\u5168\u306b\u5b9f\u88c5\u3067\u304d\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305f\u3068\u3048\u3070\u3001\u4e00\u822c\u306b\u3001\u30e9\u30f3\u30c0\u30e0\u5316\u95a2\u6570\u306f\u4e88\u6e2c\u4e0d\u80fd\u3067\u3042\u308b\u305f\u3081\u3001\u6697\u53f7\u5316\u30ad\u30fc\u306e\u751f\u6210\u306b\u4f7f\u7528\u3067\u304d\u308b\u3068\u8aa4\u89e3\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u30e9\u30f3\u30c0\u30e0\u5316\u95a2\u6570\u306f\u6697\u53f7\u5316\u307e\u305f\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306b\u4f7f\u7528\u3059\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u6b8b\u5ff5\u306a\u3053\u3068\u306b\u3001DNS\u306e\u5b9f\u88c5\u3067\u306f\u3057\u3070\u3057\u3070\u3001\u30e9\u30f3\u30c0\u30e0\u5316\u95a2\u6570\u306e\u8aa4\u7528\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/github.com\/miekg\/dns\/issues\/1043\">2\u5e74\u524d<\/a>\u306b\u3001CoreDNS\u3067\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u30e9\u30f3\u30c0\u30e0\u5316\u3059\u308b\u306e\u306b\u4f7f\u7528\u3055\u308c\u305f\u95a2\u6570\u3067\u767a\u751f\u3057\u307e\u3057\u305f\u3002\u958b\u767a\u8005\u306f\u3001Golang\u306e\u975e\u6697\u53f7\u7684\u306b\u5b89\u5168\u306a\u7591\u4f3c\u4e71\u6570\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u3067\u3042\u308b<span style=\"font-family: 'courier new', courier, monospace;\">math.rand<\/span>\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001\u5927\u304d\u306a\u554f\u984c\u3067\u3057\u305f\u3002\u653b\u6483\u8005\u304c\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3ID\u3092\u4e88\u6e2c\u3067\u304d\u308b\u5834\u5408\u3001\u672c\u30d6\u30ed\u30b0\u3067\u8aac\u660e\u3057\u305f\u3088\u3046\u306b\u3001CoreDNS\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u78ba\u5b9f\u306b\u6c5a\u67d3\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001CoreDNS\u3092DNS\u30ea\u30be\u30eb\u30d0\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306f\u3059\u3079\u3066\u3001\u60aa\u610f\u306e\u3042\u308bDNS\u30ec\u30b3\u30fc\u30c9\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3042\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002CoreDNS\u306f\u4e3b\u3068\u3057\u3066Kubernetes\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30af\u30e9\u30b9\u30bf\u5168\u4f53\u306e\u3069\u306e\u30ce\u30fc\u30c9\u306e\u3069\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3082\u3053\u306e\u653b\u6483\u3092\u53d7\u3051\u3084\u3059\u3044\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3082\u30461\u3064\u306e\u4f8b\u306f\u3001<a href=\"https:\/\/dl.acm.org\/doi\/pdf\/10.1145\/3372297.3417280\">\u6570\u9031\u9593\u524d\u306b\u767a\u898b\u3055\u308c\u305f\u3070\u304b\u308a\u306e\u65b0\u305f\u306a\u624b\u6cd5<\/a>\u3067\u3059\u3002\u3053\u306e\u624b\u6cd5\u3067\u306f\u3001Internet Control Message Protocol (ICMP)\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b5\u30fc\u30d0\u30fc\u4e0a\u3067\u9589\u3058\u3066\u3044\u308b\u30dd\u30fc\u30c8\u3092\u6b63\u78ba\u306b\u7279\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u5b9f\u969b\u306b\u7a7a\u3044\u3066\u3044\u308b\u30dd\u30fc\u30c8\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3059\u3002\u3053\u306e\u624b\u6cd5\u3092DNS\u653b\u6483\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u653b\u6483\u8005\u304c\u63a8\u6e2c\u3059\u308b\u5fc5\u8981\u306e\u3042\u308b\u30dd\u30fc\u30c8\u306e\u6570\u304c\u8457\u3057\u304f\u6e1b\u5c11\u3057\u3001\u524d\u8ff0\u306e\u30dd\u30fc\u30c8\u30e9\u30f3\u30c0\u30de\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u308b\u7de9\u548c\u7b56\u306e\u52b9\u679c\u304c\u6e1b\u5c11\u3057\u307e\u3059\u3002<\/p>\n<p>\u3080\u308d\u3093\u3001\u30d0\u30c3\u30d5\u30a1\u30aa\u30fc\u30d0\u30fc\u30d5\u30ed\u30fc\u306e\u3088\u3046\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u95a2\u9023\u3057\u306a\u3044\u8106\u5f31\u6027\u3082\u3042\u308a\u307e\u3059\u3002<em>dnsmasq<\/em>\u306f\u591a\u304f\u306eLinux\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u304a\u3088\u3073\u30eb\u30fc\u30bf\u30fc\u3067\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u4e00\u822c\u7684\u306aDNS\u30ea\u30be\u30eb\u30d0\u3067\u3001Kubernetes\u306e\u521d\u671f\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3082\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3057\u305f\u3002\u6700\u8fd1\u3067\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u62d2\u5426(DoS)\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u5927\u91cf\u306e\u30e1\u30e2\u30ea\u306e\u6b20\u9665\u3001\u30ea\u30e2\u30fc\u30c8\u30b3\u30fc\u30c9\u5b9f\u884c(RCE)\u306a\u3069\u306b\u5bfe\u3057\u3066<a href=\"https:\/\/access.redhat.com\/security\/vulnerabilities\/3199382\"><em>dnsmasq<\/em>\u304c\u8106\u5f31\u3067\u3042\u308b\u3053\u3068<\/a>\u304c\u5224\u660e\u3057\u307e\u3057\u305f\u3002<\/p>\n<h2><a id=\"post-110465-_4gh3yx54tinj\"><\/a>\u7d50\u8ad6<\/h2>\n<p>\u672c\u30d6\u30ed\u30b0\u3067\u8aac\u660e\u3057\u305fDNS\u653b\u6483\u306f\u3001\u6210\u529f\u3057\u305f\u5834\u5408\u3001\u7834\u58ca\u7684\u306a\u7d50\u679c\u3092\u62db\u304f\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u6700\u65b0\u306e\u7de9\u548c\u7b56\u306e\u304a\u304b\u3052\u3067\u3001\u30ea\u30be\u30eb\u30d0\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4ed6\u306e\u8106\u5f31\u6027\u3068\u7d44\u307f\u5408\u308f\u305b\u306a\u3044\u9650\u308a\u3001\u653b\u6483\u8005\u304cDNS\u30dd\u30a4\u30ba\u30cb\u30f3\u30b0\u653b\u6483\u3092\u6210\u529f\u3055\u305b\u308b\u53ef\u80fd\u6027\u306f\u4f4e\u304f\u306a\u308a\u307e\u3057\u305f\u3002\u6b8b\u5ff5\u306a\u304c\u3089\u3001\u3053\u3046\u3057\u305f\u8106\u5f31\u6027\u306f\u3001\u4eca\u65e5\u305f\u3073\u305f\u3073\u691c\u51fa\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u9577\u5e74\u306b\u308f\u305f\u3063\u3066\u3001\u30ea\u30b5\u30fc\u30c1\u30e3\u30fc\u306f<a href=\"https:\/\/ripe67.ripe.net\/presentations\/240-ipfragattack.pdf\">User Datagram Protocol (\u30e6\u30fc\u30b6\u30fc \u30c7\u30fc\u30bf\u30b0\u30e9\u30e0 \u30d7\u30ed\u30c8\u30b3\u30eb - UDP)\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3<\/a>\u306a\u3069\u3001\u672c\u30d6\u30ed\u30b0\u3067\u8aac\u660e\u3057\u305f\u3044\u304f\u3064\u304b\u306e\u7de9\u548c\u7b56\u3092\u514b\u670d\u3059\u308b\u624b\u6cd5\u3092\u767a\u898b\u3057\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n<p>\u305d\u308c\u3067\u3082\u3001\u6628\u4eca\u306f\u5b89\u5168\u306a\u30d6\u30e9\u30a6\u30b8\u30f3\u30b0\u3084\u8a3c\u660e\u66f8\u304c\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u653b\u6483\u8005\u304c\u30c9\u30e1\u30a4\u30f3\u306eDNS\u30b5\u30fc\u30d0\u30fc\u3092\u6c5a\u67d3\u3057\u3088\u3046\u3068\u3057\u3066\u3082\u3001\u8a3c\u660e\u66f8\u304c\u4e00\u81f4\u3057\u306a\u3044\u305f\u3081\u3001\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u30d6\u30e9\u30a6\u30b6\u306e\u6a19\u7684\u306f\u30da\u30fc\u30b8\u3092\u30ed\u30fc\u30c9\u3057\u307e\u305b\u3093\u3002\u3057\u304b\u3057\u3001ISP\u306eDNS\u30ea\u30be\u30eb\u30d0\u3092\u6c5a\u67d3\u3057\u3001\u8981\u6c42\u3092\u5b58\u5728\u3057\u306a\u3044IP\u30a2\u30c9\u30ec\u30b9\u306b\u8ee2\u9001\u3059\u308b\u3068\u3044\u3046\u624b\u6cd5\u304c\u3001\u5927\u898f\u6a21\u306aDoS\u653b\u6483\u3067\u3044\u307e\u3060\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u304a\u5ba2\u69d8\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u65b9\u6cd5\u306b\u3088\u3063\u3066\u3001\u672c\u30d6\u30ed\u30b0\u3067\u6982\u8aac\u3057\u305f\u653b\u6483\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u6b21\u4e16\u4ee3\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306f\u3001\u7591\u308f\u3057\u3044DNS\u30af\u30a8\u30ea\u304a\u3088\u3073\u7570\u5e38\u306aDNS\u5fdc\u7b54\u3092\u691c\u51fa\u3059\u308b\u3053\u3068\u3067\u3001DNS\u653b\u6483\u3092\u30d6\u30ed\u30c3\u30af\u3067\u304d\u307e\u3059\u3002\u67af\u6e07\u307e\u305f\u306f\u5927\u91cf\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u306b\u95a2\u9023\u3059\u308b\u653b\u6483\u306f\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306b\u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308bDoS\u307e\u305f\u306f\u30be\u30fc\u30f3 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