{"id":108208,"date":"2020-07-30T01:31:48","date_gmt":"2020-07-30T08:31:48","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=108208"},"modified":"2022-10-26T18:02:47","modified_gmt":"2022-10-27T01:02:47","slug":"cve-2020-8558","status":"publish","type":"post","link":"https:\/\/origin-unit42.paloaltonetworks.com\/ja\/cve-2020-8558\/","title":{"rendered":"Kubernetes\u306e\u8106\u5f31\u6027\u3067\u30af\u30e9\u30b9\u30bf\u306b\u4e57\u3063\u53d6\u308a\u306e\u5371\u967a\u6027(CVE-2020-8558)"},"content":{"rendered":"<h2><strong>\u6982\u8981<\/strong><\/h2>\n<p>Kubernetes\u30ce\u30fc\u30c9\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8kube-proxy\u3067\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u554f\u984c(<a href=\"https:\/\/cve.mitre.org\/cgi-bin\/cvename.cgi?name=CVE-2020-8558\">CVE-2020-8558<\/a>)\u304c\u6700\u8fd1\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001\u8a8d\u8a3c\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044Kubernetes\u30ce\u30fc\u30c9\u306e\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u304c\u5371\u967a\u306b\u3055\u3089\u3055\u308c\u307e\u3059\u3002\u7279\u5b9a\u306eKubernetes\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u3067\u306f\u3001\u3053\u306e\u554f\u984c\u306b\u3088\u308aapi-server\u304c\u5371\u967a\u306b\u3055\u3089\u3055\u308c\u3001\u8a8d\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u653b\u6483\u8005\u304c\u30af\u30e9\u30b9\u30bf\u3092\u5b8c\u5168\u306b\u5236\u5fa1\u3067\u304d\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306a\u30a2\u30af\u30bb\u30b9\u304c\u53ef\u80fd\u306a\u653b\u6483\u8005\u306f\u3001\u6a5f\u5bc6\u60c5\u5831\u3092\u76d7\u307f\u51fa\u3057\u3001\u30af\u30ea\u30d7\u30c8\u30de\u30a4\u30ca\u30fc(\u4eee\u60f3\u901a\u8ca8\u63a1\u6398\u30de\u30eb\u30a6\u30a7\u30a2)\u3092\u5c55\u958b\u3057\u3001\u65e2\u5b58\u306e\u30b5\u30fc\u30d3\u30b9\u3092\u5b8c\u5168\u306b\u524a\u9664\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8106\u5f31\u6027\u304c\u539f\u56e0\u3067\u3001\u30ce\u30fc\u30c9\u306elocalhost\u30b5\u30fc\u30d3\u30b9(\u30ce\u30fc\u30c9\u81ea\u4f53\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\u306e\u307f\u304c\u610f\u56f3\u3055\u308c\u305f\u30b5\u30fc\u30d3\u30b9)\u304c\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u30db\u30b9\u30c8\u3068\u30ce\u30fc\u30c9\u4e0a\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30dd\u30c3\u30c9\u306b\u6652\u3055\u308c\u307e\u3059\u3002localhost\u5c02\u7528\u306e\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u3001\u4fe1\u983c\u3067\u304d\u308b\u30ed\u30fc\u30ab\u30eb\u306a\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308b\u30a2\u30af\u30bb\u30b9\u306e\u307f\u3092\u60f3\u5b9a\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u8a8d\u8a3c\u306a\u3057\u3067\u8981\u6c42\u306b\u5fdc\u7b54\u3057\u307e\u3059\u3002\u30ce\u30fc\u30c9\u3067\u8a8d\u8a3c\u3092\u5b9f\u65bd\u305b\u305a\u306blocalhost\u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u3053\u306e\u554f\u984c\u306e\u5f71\u97ff\u3092\u53d7\u3051\u307e\u3059\u3002<\/p>\n<p>\u554f\u984c\u306e\u8a73\u7d30\u306f2020\u5e744\u670818\u65e5\u306b<a href=\"https:\/\/github.com\/kubernetes\/kubernetes\/issues\/90259\">\u516c\u958b\u3055\u308c<\/a>\u30012020\u5e746\u67081\u65e5\u306b<a href=\"https:\/\/github.com\/kubernetes\/kubernetes\/pull\/91569\">\u30d1\u30c3\u30c1<\/a>\u304c\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u307e\u3057\u305f\u3002\u5f0a\u793e\u3067Kubernetes\u30af\u30e9\u30b9\u30bf\u3078\u306e\u305d\u306e\u4ed6\u306e\u5f71\u97ff\u3092\u8a55\u4fa1\u3057\u305f\u7d50\u679c\u3001\u4e00\u90e8\u306eKubernetes\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u3067\u306f\u3001\u901a\u5e38\u306f\u30de\u30b9\u30bf\u30fc\u30ce\u30fc\u30c9\u5185\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044api-server\u306e<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u304c\u7121\u52b9\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002\u653b\u6483\u8005\u306fCVE-2020-8558\u3092\u60aa\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3001\u30af\u30e9\u30b9\u30bf\u3092\u5b8c\u5168\u306b\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u5f0a\u793e\u306f\u3001\u3053\u306e\u8106\u5f31\u6027\u306e\u6f5c\u5728\u7684\u306a\u5f71\u97ff\u306b\u3064\u3044\u3066\u3001Kubernetes\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30c1\u30fc\u30e0\u306b\u8b66\u544a\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u3092\u53d7\u3051\u3001\u540c\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30c1\u30fc\u30e0\u306f\u3001api-server\u306e<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u30af\u30e9\u30b9\u30bf\u3067\u306f\u8106\u5f31\u6027\u306e\u5f71\u97ff\u304c\u9ad8\u304f\u3001\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u5f71\u97ff\u306f\u4e2d\u7a0b\u5ea6\u3068\u8a55\u4fa1\u3057\u307e\u3057\u305f\u3002\u5e78\u3044\u3001Azure Kubernetes Service (AKS)\u3001Amazon\u306eElastic Kubernetes Service (EKS)\u3001Google Kubernetes Engine (GKE)\u306a\u3069\u306e\u5927\u534a\u306eKubernetes\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u3001CVE-2020-8558\u306e\u5f71\u97ff\u306f\u591a\u5c11\u6291\u3048\u3089\u308c\u3066\u3044\u307e\u3059\u3002CVE-2020-8558\u306f\u3001Kubernetes\u306ev1.18.4\u3001v1.17.7\u3001\u304a\u3088\u3073v1.16.11 (2020\u5e746\u670817\u65e5\u306b\u30ea\u30ea\u30fc\u30b9)\u3067\u4fee\u6b63\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u304c\u63a8\u5968\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u5f0a\u793e\u306ePrisma Cloud\u3092\u3054\u5229\u7528\u4e2d\u306e\u304a\u5ba2\u69d8\u306f\u3001\u300c\u7d50\u8ad6\u300d\u3067\u89e3\u8aac\u3057\u3066\u3044\u308b\u6a5f\u80fd\u306b\u3088\u308a\u540c\u8106\u5f31\u6027\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2><strong>kube-proxy<\/strong><\/h2>\n<p>kube-proxy\u306f\u3001Kubernetes\u30af\u30e9\u30b9\u30bf\u306e\u5404\u30ce\u30fc\u30c9\u3067\u52d5\u4f5c\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d7\u30ed\u30ad\u30b7\u3067\u3001\u30dd\u30c3\u30c9\u2212\u30b5\u30fc\u30d3\u30b9\u9593\u306e\u63a5\u7d9a\u3092\u7ba1\u7406\u3057\u3066\u3044\u307e\u3059\u3002<a href=\"https:\/\/kubernetes.io\/docs\/concepts\/services-networking\/service\/\">Kubernetes\u30b5\u30fc\u30d3\u30b9<\/a>\u3067\u516c\u958b\u3055\u308c\u308b\u306e\u306f\u5358\u4e00\u306eclusterIP\u3067\u3059\u304c\u3001\u8907\u6570\u306e\u652f\u63f4\u30dd\u30c3\u30c9\u3092\u69cb\u6210\u3057\u3066\u8ca0\u8377\u5206\u6563\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u5834\u5408\u3082\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u30701\u3064\u306e\u30b5\u30fc\u30d3\u30b9\u304c\u305d\u308c\u305e\u308c\u5c02\u7528\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u6301\u30643\u3064\u306e\u30dd\u30c3\u30c9\u304b\u3089\u69cb\u6210\u3055\u308c\u3066\u3044\u3066\u3082\u300110.0.0.1\u306a\u3069\u5358\u4e00clusterIP\u306e\u307f\u304c\u516c\u958b\u3055\u308c\u307e\u3059\u3002\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u30dd\u30c3\u30c9\u306f\u3001\u305d\u306eclusterIP\u306e10.0.0.1\u306b\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3057\u307e\u3059\u304c\u3001\u3053\u3053\u304b\u3089\u4f55\u3089\u304b\u306e\u65b9\u6cd5\u3067\u30b5\u30fc\u30d3\u30b9\u62bd\u8c61\u5316\u306e\u80cc\u5f8c\u306b\u3042\u308b\u30dd\u30c3\u30c9\u306e1\u3064\u306b\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u3066\u3084\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067kube-proxy\u306e\u767b\u5834\u3067\u3059\u3002kub-proxy\u304c\u5404\u30ce\u30fc\u30c9\u4e0a\u306b\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30c6\u30fc\u30d6\u30eb\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3067\u3001\u30b5\u30fc\u30d3\u30b9\u3092\u652f\u63f4\u3059\u308b\u30dd\u30c3\u30c9\u306e1\u3064\u306b\u7279\u5b9a\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u8981\u6c42\u3092\u304d\u3061\u3093\u3068\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u306e\u3067\u3059\u3002\u3053\u306ekube-proxy\u306f\u3001\u4e00\u822c\u306b\u9759\u7684\u30dd\u30c3\u30c9\u304bDaemonSet\u306e\u4e00\u90e8\u3068\u3057\u3066\u30c7\u30d7\u30ed\u30a4\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<p>\u8208\u5473\u304c\u3042\u308c\u3070\u8a73\u7d30\u306b\u3064\u3044\u3066<a href=\"https:\/\/cloud.google.com\/kubernetes-engine\/docs\/concepts\/network-overview#kube-proxy\">GKE\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a>\u3092\u53c2\u7167\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u306a\u304a\u3001<a href=\"https:\/\/cilium.io\/\">Cilium<\/a>\u306a\u3069\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30ad\u30f3\u30b0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3092\u8a2d\u5b9a\u3059\u308c\u3070\u3001kube-proxy\u3092\u5b8c\u5168\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2><strong>\u539f\u56e0\u306froute_localnet<\/strong><\/h2>\n<p>kube-proxy\u306b\u306f<a href=\"https:\/\/www.kernel.org\/doc\/Documentation\/sysctl\/README\">sysctl\u30d5\u30a1\u30a4\u30eb<\/a>\u3092\u4f7f\u3063\u3066\u8907\u6570\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3044\u3046\u5f79\u5272\u3082\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u305d\u3053\u3067\u8a2d\u5b9a\u3055\u308c\u308b\u5185\u5bb9\u306e1\u3064\u304c<span style=\"font-family: 'courier new', courier, monospace;\">net.ipv4.conf.all.route_localnet<\/span>\u3067\u3001\u3053\u308c\u304c\u4eca\u56de\u306e\u8106\u5f31\u6027\u306e\u539f\u56e0\u3067\u3059\u3002<a href=\"https:\/\/sysctl-explorer.net\/net\/ipv4\/route_localnet\/\">Sysctl\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8<\/a>\u306b\u306f\u300croute_localnet: Do not consider loopback addresses as martian source or destination while routing. This enables the use of 127\/8 for local routing purposes. default FALSE.\u300d(route_localnet: \u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u6642\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u30a2\u30c9\u30ec\u30b9\u3092\u300c\u3042\u308a\u3048\u306a\u3044(Martian)\u300d\u9001\u4fe1\u5143\u30a2\u30c9\u30ec\u30b9\/\u5b9b\u5148\u30a2\u30c9\u30ec\u30b9\u3068\u898b\u306a\u3055\u306a\u3044\u3002\u3053\u308c\u306b\u3088\u308a\u30ed\u30fc\u30ab\u30eb\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u6642127.0.0.0\/8\u304c\u4f7f\u7528\u53ef\u80fd\u306b\u306a\u308b\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u306fFALSE\u3002)\u3068\u8a18\u8f09\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u610f\u5473\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u3087\u3046\u3002IPv4\u3067\u306f\u3001\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u30a2\u30c9\u30ec\u30b9\u306f127.0.0.0\/8\u30a2\u30c9\u30ec\u30b9\u30d6\u30ed\u30c3\u30af(127.0.0.1\uff5e127.255.255.255)\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u304c\u3001\u4e00\u822c\u306b\u306f127.0.0.1\u306e\u307f\u304c\u4f7f\u7528\u3055\u308c\u3001\u30db\u30b9\u30c8\u540d\u300clocalhost\u300d\u304c\u3053\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u3001\u30de\u30b7\u30f3\u304c\u81ea\u8eab\u3092\u53c2\u7167\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3082\u306e\u3067\u3001\u30ed\u30fc\u30ab\u30eb\u30b5\u30fc\u30d3\u30b9\u3092\u5bfe\u8c61\u3068\u3059\u308b\u30d1\u30b1\u30c3\u30c8\u306f\u3001\u30eb\u30fc\u30d7\u30d0\u30c3\u30af \u30cd\u30c3\u30c8\u30ef\u30fc\u30af \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4ecb\u3057\u3066IP 127.0.0.1\u306b\u9001\u4fe1\u3055\u308c\u3001\u9001\u4fe1\u5143IP\u3082127.0.0.1\u306b\u8a2d\u5b9a\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3068\u3053\u308d\u304c\u3053\u3053\u3067<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u3092\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u30ab\u30fc\u30cd\u30eb\u306b\u5bfe\u3057\u3066\u3001127.0.0.1\/8 IP\u30a2\u30c9\u30ec\u30b9\u3092<strong>Martian<\/strong>\u3068\u3057\u3066\u5b9a\u7fa9<strong>\u3057\u306a\u3044<\/strong>\u3088\u3046\u6307\u793a\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u306f\u300cMartian\u300d(\u706b\u661f\u4eba)\u3068\u306f\u4f55\u3092\u610f\u5473\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b? \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3067\u53d7\u4fe1\u3059\u308b\u4e00\u90e8\u306e\u30d1\u30b1\u30c3\u30c8\u306f\u3001\u305d\u306e\u9001\u4fe1\u5143\u307e\u305f\u306f\u5b9b\u5148IP\u306b\u3064\u3044\u3066\u3001\u610f\u5473\u3092\u306a\u3055\u306a\u3044\u4e3b\u5f35\u3092\u884c\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u9001\u4fe1\u5143IP\u304c255.255.255.255\u3067\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u305f\u3068\u3057\u307e\u3059\u3002\u3053\u306e\u30d1\u30b1\u30c3\u30c8\u306f\u5b58\u5728\u3057\u3066\u306f\u306a\u308a\u307e\u305b\u3093\u3002255.255.255.255\u306f\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3092\u793a\u3059\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u4e88\u7d04\u6e08\u307f\u30a2\u30c9\u30ec\u30b9\u3067\u3042\u308a\u3001\u30db\u30b9\u30c8\u3092\u8b58\u5225\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3067\u306f\u3001\u4f55\u304c\u8d77\u304d\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b? \u30ab\u30fc\u30cd\u30eb\u306b\u306f\u305d\u306e\u5224\u65ad\u306f\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30d1\u30b1\u30c3\u30c8\u304cMars (\u706b\u661f)\u304b\u3089\u6765\u305f\u3082\u306e\u3067\u3042\u308b\u3068\u7d50\u8ad6\u4ed8\u3051\u3001\u5ec3\u68c4\u3059\u308b\u3057\u304b\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>Martian\u30d1\u30b1\u30c3\u30c8\u306f\u305f\u3044\u3066\u3044\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u60aa\u610f\u306e\u3042\u308b\u8ab0\u304b\u304c\u653b\u6483\u3057\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u524d\u8ff0\u306e\u4f8b\u3067\u306f\u3001\u653b\u6483\u8005\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u306bIP 255.255.255.255\u306b\u5fdc\u7b54\u3055\u305b\u308b\u3053\u3068\u306b\u3088\u308a\u3001\u30eb\u30fc\u30bf\u30fc\u306b\u5fdc\u7b54\u3092\u30d6\u30ed\u30fc\u30c9\u30ad\u30e3\u30b9\u30c8\u3055\u305b\u3088\u3046\u3068\u3057\u3066\u3044\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u602a\u3057\u3044\u5b9b\u5148IP\u304c\u539f\u56e0\u3067\u3001\u30d1\u30b1\u30c3\u30c8\u304cMartian\u3067\u3042\u308b\u3068\u898b\u306a\u3055\u308c\u308b\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001\u5b9b\u5148IP 127.0.0.1\u3067\u5916\u90e8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306b\u7740\u4fe1\u3059\u308b\u30d1\u30b1\u30c3\u30c8\u3067\u3059\u3002\u3053\u306e\u30d1\u30b1\u30c3\u30c8\u3082\u610f\u5473\u3092\u306a\u3057\u307e\u305b\u3093\u3002127.0.0.1\u306f\u3001\u30eb\u30fc\u30d7\u30d0\u30c3\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u3092\u4ecb\u3057\u305f\u5185\u90e8\u901a\u4fe1\u7528\u306b\u4f7f\u7528\u3055\u308c\u308b\u3082\u306e\u3067\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5074\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u304b\u3089\u7740\u4fe1\u3059\u308b\u3082\u306e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Martian\u30d1\u30b1\u30c3\u30c8\u306e\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/tools.ietf.org\/html\/rfc1812#section-5.3.7\">RFC 1812<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u4e00\u90e8\u306e\u8907\u96d1\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u30ab\u30fc\u30cd\u30eb\u306b\u7279\u5b9a\u306eMartian\u30d1\u30b1\u30c3\u30c8\u306e\u901a\u904e\u3092\u8a31\u53ef\u3055\u305b\u305f\u65b9\u304c\u3088\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u306f\u3053\u306e\u305f\u3081\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001127.0.0.0\/8\u3092Martian\u30a2\u30c9\u30ec\u30b9\u3068\u898b\u306a\u3055\u306a\u3044\u3088\u3046\u306b\u30ab\u30fc\u30cd\u30eb\u306b\u6307\u793a\u3057\u307e\u3059(\u524d\u8ff0\u306e\u3088\u3046\u306b\u3001\u901a\u5e38\u306fMartian\u30a2\u30c9\u30ec\u30b9\u3068\u898b\u306a\u3055\u308c\u308b\u305f\u3081)\u3002\u3053\u3053\u3067\u306f\u8a73\u3057\u304f\u8aac\u660e\u3057\u307e\u305b\u3093\u304c\u3001kube-proxy\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u6280\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3088\u3046\u306b<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u3092\u6709\u52b9\u306b\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u306f\u7406\u7531\u304c\u3042\u3063\u3066\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u7121\u52b9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u9069\u5207\u306a\u5bfe\u7b56\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u306a\u3044\u9650\u308a\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u653b\u6483\u8005\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u3092\u60aa\u7528\u3057\u3066\u8907\u6570\u306e\u653b\u6483\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u6700\u3082\u5f71\u97ff\u304c\u5927\u304d\u3044\u306e\u304c\u3001localhost\u5c02\u7528\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3067\u3059\u3002<\/p>\n<h4>localhost\u5c02\u7528\u30b5\u30fc\u30d3\u30b9<\/h4>\n<p>Linux\u3067\u306f\u3001\u5404\u30d7\u30ed\u30bb\u30b9\u304c\u81ea\u8eab\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306e\u30a2\u30c9\u30ec\u30b9\u306b\u30d0\u30a4\u30f3\u30c9\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u7279\u5b9a\u306eIP\u30a2\u30c9\u30ec\u30b9\u306e\u307f\u3092\u30ea\u30c3\u30b9\u30f3\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u306f\u305f\u3044\u3066\u3044\u3053\u306e\u6a5f\u80fd\u3092\u4f7f\u7528\u3057\u3066\u3001127.0.0.1\u306e\u307f\u3092\u30ea\u30c3\u30b9\u30f3\u3057\u307e\u3059\u3002\u901a\u5e38\u3053\u308c\u306b\u3088\u308a\u3001127.0.0.1\u306b\u5230\u9054\u3067\u304d\u308b\u306e\u306f\u30ed\u30fc\u30ab\u30eb\u30d7\u30ed\u30bb\u30b9\u306e\u307f\u3067\u3042\u308b\u305f\u3081\u3001\u30ed\u30fc\u30ab\u30eb\u30d7\u30ed\u30bb\u30b9\u306e\u307f\u304c\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3057\u304b\u3057\u3001<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u304c127.0.0.0\/8\u5b9b\u3066\u306e\u5916\u90e8\u30d1\u30b1\u30c3\u30c8\u3092\u8a31\u53ef\u3059\u308b\u3053\u3068\u3067\u3053\u306e\u524d\u63d0\u306f\u5d29\u308c\u307e\u3059\u3002\u5916\u90e8\u30d1\u30b1\u30c3\u30c8\u304c\u5230\u9054\u3059\u308b\u3053\u3068\u306f\u306a\u3044\u3068\u3044\u3046\u524d\u63d0\u304c\u3042\u308b\u304c\u3086\u3048\u306b\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u306f\u8a8d\u8a3c\u3092\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u591a\u304f\u3001\u3053\u308c\u306f\u5927\u304d\u306a\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h4>\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9<\/h4>\n<p>\u653b\u6483\u5bfe\u8c61\u306e\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u8a66\u307f\u308b\u653b\u6483\u8005\u306f\u3001\u5b9b\u5148IP\u30a2\u30c9\u30ec\u30b9\u3092127.0.0.1\u306b\u3001\u5b9b\u5148MAC\u30a2\u30c9\u30ec\u30b9\u3092\u88ab\u5bb3\u8005\u306eMAC\u30a2\u30c9\u30ec\u30b9\u306b\u8a2d\u5b9a\u3057\u305f\u60aa\u610f\u306e\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305f\u3060\u3057\u610f\u5473\u306e\u306a\u3044\u5b9b\u5148IP\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u653b\u6483\u8005\u306e\u30d1\u30b1\u30c3\u30c8\u304c\u653b\u6483\u5bfe\u8c61\u306b\u5230\u9054\u3059\u308b\u306e\u306b\u30ec\u30a4\u30e4\u30fc2 (MAC\u30d9\u30fc\u30b9\u306e)\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3057\u304b\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u653b\u6483\u306f\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306b\u9650\u5b9a\u3055\u308c\u307e\u3059\u3002\u3064\u307e\u308a\u3001\u653b\u6483\u5bfe\u8c61\u30de\u30b7\u30f3\u304c<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u305f\u3068\u3057\u3066\u3082\u3001\u305d\u306elocalhost\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u306e\u306f\u3001\u653b\u6483\u8005\u304c\u540c\u3058\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306b\u3044\u308b\u5834\u5408\u3060\u3051\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u304c\u6709\u52b9\u306a\u306e\u3067\u3001\u60aa\u610f\u306e\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u3092\u53d7\u4fe1\u3057\u305f\u88ab\u5bb3\u30de\u30b7\u30f3\u306f\u3053\u306e\u30d1\u30b1\u30c3\u30c8\u3092\u901a\u904e\u3055\u305b\u307e\u3059\u3002\u305d\u3057\u3066\u30d1\u30b1\u30c3\u30c8\u306e\u5b9b\u5148IP\u306f127.0.0.1\u306a\u306e\u3067\u3001localhost\u30b5\u30fc\u30d3\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u304c\u8a31\u53ef\u3055\u308c\u307e\u3059\u3002\u88681\u306b\u3001\u60aa\u610f\u306e\u3042\u308b\u30d1\u30b1\u30c3\u30c8\u306e\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002\u653b\u6483\u8005\u306eIP\u306f10.0.0.1\u3001MAC\u30a2\u30c9\u30ec\u30b9\u306fXXX\u3067\u3042\u308a\u3001\u5b9b\u5148IP\u306f10.0.0.0.2\u3001MAC\u30a2\u30c9\u30ec\u30b9\u306fYYY\u3067\u3059\u3002\u6a19\u7684\u306f\u30dd\u30fc\u30c81234\u4e0a\u3067localhost\u5c02\u7528\u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<table style=\"height: 95px; width: 100.413%; border-color: #000000;\">\n<tbody>\n<tr style=\"height: 53px;\">\n<td style=\"width: 22.0532%; background-color: #bdbfbf; height: 53px; text-align: center;\">\n<p style=\"text-align: center;\">src mac<\/p>\n<\/td>\n<td style=\"width: 23.1939%; text-align: center; height: 53px;\">XXX<\/td>\n<td style=\"width: 23.637%; background-color: #bdbfbf; height: 53px; text-align: center;\">dst mac<\/td>\n<td style=\"width: 282.206%; text-align: center; height: 53px;\">YYY<\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 22.0532%; background-color: #bdbfbf; height: 21px; text-align: center;\">src ip<\/td>\n<td style=\"width: 23.1939%; text-align: center; height: 21px;\">10.0.0.1<\/td>\n<td style=\"width: 23.637%; background-color: #bdbfbf; height: 21px; text-align: center;\">dst ip<\/td>\n<td style=\"width: 282.206%; text-align: center; height: 21px;\"><strong>127.0.0.1<\/strong><\/td>\n<\/tr>\n<tr style=\"height: 21px;\">\n<td style=\"width: 22.0532%; background-color: #bdbfbf; height: 21px; text-align: center;\">src port<\/td>\n<td style=\"width: 23.1939%; text-align: center; height: 21px;\">random<\/td>\n<td style=\"width: 23.637%; background-color: #bdbfbf; height: 21px; text-align: center;\">dst port<\/td>\n<td style=\"width: 282.206%; text-align: center; height: 21px;\">1234<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p style=\"text-align: center;\"><em>\u56f31: <span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u3092\u60aa\u7528\u3059\u308b\u30d1\u30b1\u30c3\u30c8<\/em><\/p>\n<p>\u6a19\u7684\u306e\u5fdc\u7b54\u3092\u53d7\u4fe1\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u653b\u6483\u8005\u306f\u30d1\u30b1\u30c3\u30c8\u306b\u81ea\u8eab\u306eIP\u30a2\u30c9\u30ec\u30b9\u3092\u542b\u3081\u3066\u9001\u4fe1\u3057\u307e\u3059\u3002\u4ee5\u4e0a\u3092\u307e\u3068\u3081\u308b\u3068\u3001route_localnet\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306e\u653b\u6483\u8005\u304c\u3001\u56f31\u306e\u3088\u3046\u306a\u30d1\u30b1\u30c3\u30c8\u3067\u3001\u653b\u6483\u5bfe\u8c61\u30db\u30b9\u30c8\u306e\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2><strong>\u3053\u3053\u3067\u518d\u3073Kubernetes\u306e\u8106\u5f31\u6027\u306b\u3064\u3044\u3066(CVE-2020-8558)<\/strong><\/h2>\n<p>\u3068\u3044\u3046\u3053\u3068\u3067\u3001kube-proxy\u304c\u539f\u56e0\u3067\u30af\u30e9\u30b9\u30bf\u5185\u306e\u30ce\u30fc\u30c9\u306f\u3059\u3079\u3066<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3064\u307e\u308a\u5f53\u8a72\u30ce\u30fc\u30c9\u306e\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u5168\u30db\u30b9\u30c8\u304c\u3001\u30ce\u30fc\u30c9\u306e\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001\u30ce\u30fc\u30c9\u304c\u8a8d\u8a3c\u306a\u3057\u3067\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u3066\u3044\u308c\u3070\u3001\u3053\u306e\u554f\u984c\u306e\u5f71\u97ff\u3092\u53d7\u3051\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u30ce\u30fc\u30c9\u306e\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u96a3\u63a5\u3059\u308b\u30db\u30b9\u30c8\u306e\u307b\u304b\u3001\u30ce\u30fc\u30c9\u4e0a\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30dd\u30c3\u30c9\u3082\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u30dd\u30c3\u30c9\u304c\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u306e\u306f\u3001\u305d\u306e\u30dd\u30c3\u30c9\u3092\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3057\u3066\u3044\u308b\u30ce\u30fc\u30c9\u306e\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u306e\u307f\u3067\u3059\u3002\u653b\u6483\u5b9f\u884c\u306b\u306f\u30dd\u30c3\u30c9\u306b<span style=\"font-family: 'courier new', courier, monospace;\">CAP_NET_RAW<\/span>\u6a5f\u80fd\u304c\u5fc5\u8981\u3067\u3059\u3002\u305d\u3057\u3066\u6b8b\u5ff5\u306a\u304c\u3089\u30c7\u30d5\u30a9\u30eb\u30c8\u3067Kubernetes\u306f\u3053\u306e\u6a5f\u80fd\u3092\u4ed8\u4e0e\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u554f\u984c\u306e\u8abf\u67fb\u6642\u306b\u3001\u79c1\u305f\u3061\u306fKubernetes\u306b\u3082\u3068\u3082\u3068\u30c7\u30d7\u30ed\u30a4\u3055\u308c\u3066\u3044\u308blocalhost\u30b5\u30fc\u30d3\u30b9\u3092\u7279\u5b9a\u3057\u3088\u3046\u3068\u3057\u307e\u3057\u305f\u3002\u305d\u306e\u969b\u3001Kubernetes\u306eapi-server\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3001<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u3068\u547c\u3070\u308c\u308b\u30dd\u30fc\u30c8\u3092\u4ecb\u3057\u3066\u3001localhost\u3067\u8a8d\u8a3c\u3055\u308c\u3066\u3044\u306a\u3044\u8981\u6c42\u3092\u51e6\u7406\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3057\u305f\u3002<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u306f\u3001\u30de\u30b9\u30bf\u30fc\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u305d\u306e\u4ed6\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb \u30d7\u30ec\u30fc\u30f3 \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8(etcd\u306a\u3069)\u304capi-server\u3068\u7c21\u5358\u306b\u5bfe\u8a71\u3067\u304d\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30dd\u30fc\u30c8\u3067\u306f\u3001\u30ed\u30fc\u30eb\u30d9\u30fc\u30b9\u306e\u30a2\u30af\u30bb\u30b9\u5236\u5fa1(RBAC)\u3084\u305d\u306e\u4ed6\u306e\u8a8d\u8a3c\u30e1\u30ab\u30cb\u30ba\u30e0\u306f\u5b9f\u65bd\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002Kubernetes\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u3067\u306f\u3001api-server\u304c\u30de\u30b9\u30bf\u30fc\u30ce\u30fc\u30c9\u4e0a\u306e\u30dd\u30c3\u30c9\u3068\u3057\u3066\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u3064\u307e\u308a\u3001<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308bkube-proxy\u3068\u4e00\u7dd2\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u6050\u308d\u3057\u3044\u3053\u3068\u306b\u3001\u3053\u308c\u306fKubernetes\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u3067<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u3092\u7121\u52b9\u306b\u3057\u3066\u3044\u306a\u3044\u3068\u3001\u30de\u30b9\u30bf\u30fc\u30ce\u30fc\u30c9\u306e\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u30db\u30b9\u30c8\u304cCVE-2020-8558\u3092\u60aa\u7528\u3059\u308b\u3053\u3068\u306b\u3088\u308a\u3001api-server\u3092\u64cd\u308a\u3001\u30af\u30e9\u30b9\u30bf\u3092\u5b8c\u5168\u306b\u5236\u5fa1\u3067\u304d\u308b\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<h4>\u30de\u30cd\u30fc\u30b8\u30c9Kubernetes<\/h4>\n<p>GKE\u3001EKS\u3001AKS\u306a\u3069\u306e\u30de\u30cd\u30fc\u30b8\u30c9Kubernetes\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306f\u3001CVE-2020-8558\u304b\u3089\u3088\u308a\u5f37\u529b\u306b\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u307e\u305a\u3001<a href=\"https:\/\/docs.microsoft.com\/en-us\/azure\/virtual-network\/virtual-networks-faq#can-i-bring-my-vlans-to-azure-using-vnets\">Microsoft Azure<\/a>\u306a\u3069\u306e\u4e00\u90e8\u306e\u30af\u30e9\u30a6\u30c9 \u30b5\u30fc\u30d3\u30b9 \u30d7\u30ed\u30d0\u30a4\u30c0(CSP)\u306e\u4eee\u60f3\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u306f\u3001\u30ec\u30a4\u30e4\u30fc2\u306e\u30bb\u30de\u30f3\u30c6\u30a3\u30af\u30b9\u304a\u3088\u3073MAC\u30d9\u30fc\u30b9\u306e\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u308f\u304b\u308a\u3084\u3059\u304f\u8a00\u3046\u3068\u3001\u305f\u3068\u3048\u3070\u3059\u3079\u3066\u306eAKS\u30de\u30b7\u30f3\u306f\u3001\u540c\u3058MAC\u30a2\u30c9\u30ec\u30b912:34:56:78:9A:BC\u3092\u6301\u3061\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ce\u30fc\u30c9\u306e\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u4ed6\u306e\u30db\u30b9\u30c8\u306b\u3088\u308bCVE-2020-8558\u306e\u60aa\u7528\u306e\u53ef\u80fd\u6027\u3092\u8efd\u6e1b\u3067\u304d\u307e\u3059\u304c\u3001<span style=\"font-family: 'courier new', courier, monospace;\">CAP_NET_RAW<\/span>\u6a5f\u80fd\u3092\u6301\u3064\u60aa\u610f\u306e\u3042\u308b\u30dd\u30c3\u30c9\u306f\u5f15\u304d\u7d9a\u304d\u653b\u6483\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u591a\u304f\u306e\u30af\u30e9\u30a6\u30c9\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u578bKubernetes\u30b5\u30fc\u30d3\u30b9\u3067\u306f\u3001Kubernetes\u306e\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30d7\u30ec\u30fc\u30f3\u304a\u3088\u3073api-server\u306e\u7ba1\u7406\u3092\u4ee3\u884c\u3057\u3001\u30af\u30e9\u30b9\u30bf\u306e\u305d\u306e\u4ed6\u306e\u90e8\u5206\u3068\u306f\u5225\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u3067\u5b9f\u884c\u3057\u307e\u3059\u3002\u30af\u30e9\u30b9\u30bf\u306e\u305d\u306e\u4ed6\u306e\u90e8\u5206\u306b\u306f\u3055\u3089\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u3053\u308c\u306b\u3088\u308aapi-server\u304c\u4fdd\u8b77\u3055\u308c\u307e\u3059\u3002CSP\u304c<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u3092\u7121\u52b9\u306b\u305b\u305a\u306bapi-server\u3092\u5b9f\u884c\u3057\u3066\u3082\u3001\u540c\u3058\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001\u30af\u30e9\u30b9\u30bf\u5185\u306e\u653b\u6483\u8005\u306fapi-server\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u305f\u3060\u3057\u3001CSP\u306e\u4eee\u60f3\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u30ec\u30a4\u30e4\u30fc2\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30af\u30e9\u30b9\u30bf\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5185\u306b\u304a\u3051\u308b\u60aa\u610f\u306e\u3042\u308b\u30db\u30b9\u30c8\u306f\u3001\u30ef\u30fc\u30ab\u30fc\u30ce\u30fc\u30c9\u4e0a\u306elocalhost\u30b5\u30fc\u30d3\u30b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<h2><strong>\u4fee\u6b63<\/strong><\/h2>\n<p><a href=\"https:\/\/github.com\/kubernetes\/kubernetes\/pull\/91569\">\u6700\u521d\u306e\u4fee\u6b63<\/a>\u306f\u5b9f\u306fkubelet\u5185\u306b\u5b58\u5728\u3057\u3001<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<span style=\"font-family: georgia, palatino, serif;\">:<\/span><\/span>\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u30eb\u30fc\u30eb\u306b\u5bfe\u7b56\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30ce\u30fc\u30c9\u306f127.0.0.1\u5b9b\u3066\u306e\u5916\u90e8\u30d1\u30b1\u30c3\u30c8\u3092\u5ec3\u68c4\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u306e\u57f7\u7b46\u6642\u306b\u306f\u3001<span style=\"font-family: 'courier new', courier, monospace;\">route_localnet<\/span>\u306f\u307e\u3060kube-proxy\u306b\u3088\u308a\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3092<a href=\"https:\/\/github.com\/kubernetes\/kubernetes\/issues\/90259\">\u7121\u52b9\u306b\u3059\u308b<\/a>\u3053\u3068\u306b\u3064\u3044\u3066\u306f\u3001<a href=\"https:\/\/github.com\/kubernetes\/kubernetes\/issues\/90259#issuecomment-656520596\">\u7d99\u7d9a\u7684\u306b\u8b70\u8ad6\u304c\u884c\u308f\u308c\u3066\u3044\u307e\u3059<\/a>\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u5bfe\u7b56\u3092\u5b9f\u65bd\u3057\u3066\u3082\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306e\u653b\u6483\u8005\u304c\u30ce\u30fc\u30c9\u306e\u5185\u90e8UDP\u30b5\u30fc\u30d3\u30b9\u306b\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3067\u304d\u308b\u7279\u5225\u306a\u30b1\u30fc\u30b9\u304c\u307e\u3060\u5b58\u5728\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3053\u306e\u653b\u6483\u306f\u3001\u88ab\u5bb3\u8005\u30ce\u30fc\u30c9\u3067<a href=\"https:\/\/tldp.org\/HOWTO\/Adv-Routing-HOWTO\/lartc.kernel.rpf.html\">\u30ea\u30d0\u30fc\u30b9 \u30d1\u30b9 \u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/a>\u304c\u7121\u52b9\u306b\u306a\u3063\u3066\u3044\u308b(\u901a\u5e38\u306f\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b)\u5834\u5408\u306b\u306e\u307f\u53ef\u80fd\u3067\u3042\u308a\u3001\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u306f\u653b\u6483\u8005\u306f\u5fdc\u7b54\u3092\u5f97\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<a href=\"https:\/\/github.com\/kubernetes\/kubernetes\/pull\/91666\">\u30d1\u30c3\u30c1<\/a>\u958b\u767a\u4e2d\u3067\u3059\u304c\u3001\u653b\u6483\u304c\u4e0d\u78ba\u304b\u306a\u8a2d\u5b9a(<span style=\"font-family: 'courier new', courier, monospace;\">rp_filter=0<\/span>)\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u4e2d\u6b62\u3055\u308c\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n<h2><strong>\u5f71\u97ff\u306e\u6709\u7121<\/strong><\/h2>\n<p>\u4ee5\u4e0b\u306e\u9805\u76ee\u306b\u3059\u3079\u3066\u8a72\u5f53\u3059\u308b\u30af\u30e9\u30b9\u30bf\u306fCVE-2020-8558\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30af\u30e9\u30b9\u30bf\u3067\u8106\u5f31\u306a\u30d0\u30fc\u30b8\u30e7\u30f3(v1.18.4\u3001v1.17.7\u3001\u304a\u3088\u3073v1.16.11\u3088\u308a\u524d\u306e\u30d0\u30fc\u30b8\u30e7\u30f3)\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u3002\n<ul>\n<li>\u3053\u306e\u554f\u984c\u306fkube-proxy\u3067\u767a\u751f\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u30d1\u30c3\u30c1\u306fkubelet\u5185\u306b\u542b\u307e\u308c\u308b\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u30ce\u30fc\u30c9\u4e0a\u3067kube-proxy\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u3002<\/li>\n<li>\u30ce\u30fc\u30c9(\u307e\u305f\u306fhostnetwork\u30dd\u30c3\u30c9)\u3067\u3001\u8ffd\u52a0\u306e\u8a8d\u8a3c\u3092\u8981\u6c42\u3057\u306a\u3044localhost\u5c02\u7528\u30b5\u30fc\u30d3\u30b9\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<p>\u307e\u305f\u3001\u4ee5\u4e0b\u306e\u9805\u76ee\u3082\u8a72\u5f53\u3059\u308b\u5834\u5408\u3001api-server\u306e<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u3092\u4ecb\u3057\u3066\u3001\u30af\u30e9\u30b9\u30bf\u304c\u5b8c\u5168\u306b\u4e57\u3063\u53d6\u3089\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li>\u30af\u30e9\u30b9\u30bf\u3067\u3001<span style=\"font-family: 'courier new', courier, monospace;\">--insecure-port=0<\/span>\u306b\u3088\u308a\u3001api-server\u306e<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u3092\u7121\u52b9\u306b\u3057\u3066\u3044\u306a\u3044\u3002<\/li>\n<li>api-server\u304c\u30dd\u30c3\u30c9\u81ea\u4f53\u3067\u3042\u308b\u30c7\u30d7\u30ed\u30a4\u30e1\u30f3\u30c8\u306a\u3069\u3067\u3001api-server\u304c\u30ce\u30fc\u30c9\u4e0a\u3067kube-proxy\u3068\u4e00\u7dd2\u306b\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3002<\/li>\n<\/ul>\n<p>\u30ce\u30fc\u30c9\u306f\u3001\u30ed\u30fc\u30ab\u30eb\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4e0a\u306e\u60aa\u610f\u306e\u3042\u308b\u30db\u30b9\u30c8\u3001\u307e\u305f\u306f\u30ce\u30fc\u30c9\u4e0a\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3001<span style=\"font-family: 'courier new', courier, monospace;\">CAP_NET_RAW<\/span>\u6a5f\u80fd\u3092\u6301\u3064\u60aa\u610f\u306e\u3042\u308b\u30dd\u30c3\u30c9\u306b\u3088\u308a\u653b\u6483\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h2><strong>\u7d50\u8ad6<\/strong><\/h2>\n<p>CVE-2020-8558\u306f\u6df1\u523b\u306a\u7d50\u679c\u3092\u3082\u305f\u3089\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3067\u304d\u308b\u3060\u3051\u65e9\u304f\u30af\u30e9\u30b9\u30bf\u306b\u30d1\u30c3\u30c1\u3092\u9069\u7528\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u307e\u305fCVE-2020-8558\u306f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306f<strong>\u5f79\u306b\u7acb\u3061<\/strong>\u3001\u653b\u6483\u5bfe\u8c61\u9818\u57df\u3092\u5927\u5e45\u306b\u7e2e\u5c0f\u3057\u3066\u304f\u308c\u308b\u3053\u3068\u306b\u6c17\u4ed8\u304b\u305b\u3066\u3082\u304f\u308c\u307e\u3059\u3002api-server\u306e<span style=\"font-family: 'courier new', courier, monospace;\">insecure-port<\/span>\u306f\u7121\u52b9\u306b\u3059\u308b\u3079\u304d\u3067\u3059\u3002\u307e\u305f\u3001\u30dd\u30c3\u30c9\u306b<span style=\"font-family: 'courier new', courier, monospace;\">CAP_NET_RAW<\/span>\u304c\u5fc5\u8981\u306a\u3044\u5834\u5408\u306f\u3001\u3053\u306e\u6a5f\u80fd\u3092\u6709\u52b9\u306b\u3057\u3066\u304a\u304f\u3079\u304d\u7406\u7531\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u306e\u7279\u5b9a\u306e\u554f\u984c\u306b\u306f\u95a2\u4fc2\u3042\u308a\u307e\u305b\u3093\u304c\u3001\u30ed\u30fc\u30eb\u30d9\u30fc\u30b9\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306a\u3069\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u306e\u63a8\u5968\u4e8b\u9805\u3092\u5b9f\u65bd\u3057\u3001\u307e\u305f\u30b3\u30f3\u30c6\u30ca\u3092\u30eb\u30fc\u30c8\u4ee5\u5916\u306e\u30e6\u30fc\u30b6\u30fc\u3067\u5b9f\u884c\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n<p>\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e<a href=\"https:\/\/www.paloaltonetworks.com\/prisma\/cloud\">Prisma Cloud<\/a>\u3092\u3054\u5229\u7528\u4e2d\u306e\u304a\u5ba2\u69d8\u306f\u3001\u3053\u306e\u8106\u5f31\u6027\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u30eb\u30fc\u30eb\u306b\u3088\u308a\u30af\u30e9\u30b9\u30bf\u306f\u5b89\u5168\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u304a\u308a\u3001\u4ee5\u4e0b\u306b\u3064\u3044\u3066\u306f\u3001\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u8b66\u544a\u304c\u767a\u305b\u3089\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li>api-server\u306einsecure port<\/li>\n<li><span style=\"font-family: 'courier new', courier, monospace;\">CAP_NEW_RAW<\/span>\u6a5f\u80fd\u3092\u6301\u3064\u30dd\u30c3\u30c9<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981 Kubernetes\u30ce\u30fc\u30c9\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8kube-proxy\u3067\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u554f\u984c(CVE-2020-8558)\u304c\u6700\u8fd1\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001\u8a8d\u8a3c\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044Kub<\/p>\n","protected":false},"author":323,"featured_media":134238,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4469,4428,4470],"tags":[6268,4789],"product_categories":[4345,4458],"coauthors":[1484,1485],"class_list":["post-108208","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vulnerabilities","category-threat-research-ja","category-vulnerabilities-ja","tag-cve-2020-8558","tag-kubernetes-ja","product_categories-prisma-cloud","product_categories-prisma-cloud-ja"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Kubernetes\u306e\u8106\u5f31\u6027\u3067\u30af\u30e9\u30b9\u30bf\u306b\u4e57\u3063\u53d6\u308a\u306e\u5371\u967a\u6027(CVE-2020-8558)<\/title>\n<meta name=\"description\" content=\"Kubernetes\u30ce\u30fc\u30c9\u4e0a\u3067\u52d5\u4f5c\u3059\u308b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8kube-proxy\u3067\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u554f\u984c(CVE-2020-8558)\u304c\u6700\u8fd1\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001\u8a8d\u8a3c\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u304c\u591a\u3044Kubernetes\u30ce\u30fc\u30c9\u306e\u5185\u90e8\u30b5\u30fc\u30d3\u30b9\u304c\u5371\u967a\u306b\u3055\u3089\u3055\u308c\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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