{"id":102272,"date":"2019-07-12T12:00:30","date_gmt":"2019-07-12T19:00:30","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=102272"},"modified":"2019-12-16T21:09:41","modified_gmt":"2019-12-17T05:09:41","slug":"usbcreator-d-bus-privilege-escalation-in-ubuntu-desktop","status":"publish","type":"post","link":"https:\/\/origin-unit42.paloaltonetworks.com\/ja\/usbcreator-d-bus-privilege-escalation-in-ubuntu-desktop\/","title":{"rendered":"Ubuntu \u30c7\u30b9\u30af\u30c8\u30c3\u30d7 USBCreator D-Bus \u306e\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027\u306e\u89e3\u8aac"},"content":{"rendered":"

\u6982\u8981<\/h2>\n

USBCreator D-Bus \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001sudoer \u30b0\u30eb\u30fc\u30d7\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u653b\u6483\u8005\u306f\u3001sudo \u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u8ab2\u3055\u308c\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30dd\u30ea\u30b7\u30fc\u3092\u56de\u907f\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001\u653b\u6483\u8005\u306f\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5165\u529b\u305b\u305a\u3001root \u3068\u3057\u3066\u4efb\u610f\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4efb\u610f\u306e\u5185\u5bb9\u3067\u4e0a\u66f8\u304d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u304c\u3001\u305f\u3068\u3048\u3070\u30b7\u30e3\u30c9\u30a6\u30d5\u30a1\u30a4\u30eb\u3092\u4e0a\u66f8\u304d\u3057\u305f\u308a\u3001root \u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u8a2d\u5b9a\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u306b\u3088\u308b\u3001\u5bb9\u6613\u306a\u7279\u6a29\u6607\u683c\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002\u3053\u306e\u554f\u984c\u306f\u30016 \u6708\u306e Unit 42\u304b\u3089\u306e\u8106\u5f31\u6027\u958b\u793a\u306b\u5fdc\u3058\u3001Ubuntu \u304c\u5bfe\u5fdc\u95a2\u9023\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u30d1\u30c3\u30c1\u3092\u4f5c\u6210<\/a>\u3057\u305f\u3053\u3068\u306b\u3088\u308a\u89e3\u6c7a\u6e08\u307f\u3067\u3059\u3002<\/p>\n

D-Bus \u306e\u7c21\u5358\u306a\u7d39\u4ecb<\/h3>\n

Ubuntu \u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u306f\u3001\u30d7\u30ed\u30bb\u30b9\u9593\u901a\u4fe1\uff08IPC\uff09\u3092\u5b9f\u73fe\u3059\u308b\u4ed5\u7d44\u307f\u3068\u3057\u3066 D-Bus \u3092\u5229\u7528\u3057\u3066\u3044\u307e\u3059\u3002Ubuntu \u306b\u306f\u3001\u540c\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u30e1\u30c3\u30bb\u30fc\u30b8 \u30d0\u30b9\u304c\u8907\u6570\u5b58\u5728\u3057\u307e\u3059\u3002\u30b7\u30b9\u30c6\u30e0 \u30d0\u30b9\u306f\u4e3b\u306b\u7279\u6a29\u30b5\u30fc\u30d3\u30b9\u306b\u5229\u7528\u3055\u308c\u308b\u30e1\u30c3\u30bb\u30fc\u30b8 \u30d0\u30b9\u3067\u3001\u672c\u30d0\u30b9\u3092\u901a\u3058\u3066\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306b\u308f\u305f\u308b\u95a2\u9023\u30b5\u30fc\u30d3\u30b9\u3092\u516c\u958b\u3057\u307e\u3059\u3002\u3082\u3046\u3072\u3068\u3064\u306f\u30ed\u30b0\u30a4\u30f3\u30e6\u30fc\u30b6\u30fc\u3054\u3068\u306b1\u3064\u7528\u610f\u3055\u308c\u308b\u30bb\u30c3\u30b7\u30e7\u30f3\u30d0\u30b9\u3067\u3001\u3053\u3061\u3089\u306e\u30d0\u30b9\u306f\u305d\u306e\u7279\u5b9a\u30e6\u30fc\u30b6\u30fc\u3060\u3051\u306b\u95a2\u9023\u3057\u305f\u30b5\u30fc\u30d3\u30b9\u3092\u516c\u958b\u3059\u308b\u306e\u306b\u4f7f\u308f\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u7279\u6a29\u6607\u683c\u3092\u72d9\u3046\u306e\u3067\u3001\u3088\u308a\u9ad8\u3044\u7279\u6a29\uff08\u305f\u3068\u3048\u3070 root\uff09\u3067\u5b9f\u884c\u3055\u308c\u308b\u3053\u3068\u306e\u591a\u3044\u30b7\u30b9\u30c6\u30e0 \u30d0\u30b9\u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3057\u3066\u8abf\u67fb\u3057\u3066\u3044\u304f\u3053\u3068\u306b\u3057\u307e\u3059\u3002D-Bus \u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306f\u3001\u30bb\u30c3\u30b7\u30e7\u30f3 \u30d0\u30b9\u3054\u3068\u306b1\u3064\u306e\u300c\u30eb\u30fc\u30bf\u30fc\u300d\u3092\u4f7f\u7528\u3057\u3001\u5bfe\u8a71\u5148\u3067\u3042\u308b\u95a2\u9023\u30b5\u30fc\u30d3\u30b9\u306b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8 \u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u30ea\u30c0\u30a4\u30ec\u30af\u30c8\u3057\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3001\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u4f1d\u9054\u3057\u305f\u3044\u30b5\u30fc\u30d3\u30b9\u306e\u30a2\u30c9\u30ec\u30b9\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5404\u30b5\u30fc\u30d3\u30b9\u306f\u3001\u81ea\u8eab\u304c\u516c\u958b\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong>\u3068\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/strong>\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002\u3053\u3053\u3067\u3044\u3046\u300c\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u300d\u3068\u306f\u3001\u6a19\u6e96\u7684\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u8a00\u8a9e\u3067\u3044\u3046\u3068\u3053\u308d\u306e\u300c\u30af\u30e9\u30b9 \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u300d\u3068\u8003\u3048\u308c\u3070\u3088\u3044\u3067\u3057\u3087\u3046\u3002\u305d\u308c\u305e\u308c\u306e\u4e00\u610f\u306a\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u30d1\u30b9<\/strong>\u3092\u4f7f\u3063\u3066\u8b58\u5225\u3055\u308c\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8 \u30d1\u30b9\u306f\u3001\u30b5\u30fc\u30d3\u30b9\u304c\u516c\u958b\u3057\u3066\u3044\u308b\u5404\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4e00\u610f\u306b\u7279\u5b9a\u3059\u308b\u305f\u3081\u306e\u3001\u30d5\u30a1\u30a4\u30eb \u30b7\u30b9\u30c6\u30e0 \u30d1\u30b9\u306b\u4f3c\u305f\u6587\u5b57\u5217\u3067\u3059\u3002\u79c1\u305f\u3061\u306e\u8abf\u67fb\u3067\u5f79\u306b\u7acb\u3064\u6a19\u6e96\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306f\u3001org.freedesktop.DBus.Introspectable<\/strong> \u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u3053\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u306f Introspect (\u30a4\u30f3\u30c8\u30ed\u30b9\u30da\u30af\u30c8) \u3068\u3044\u3046\u6a5f\u80fd\u304c\u3042\u308a\u3001\u3053\u308c\u3092\u4f7f\u3046\u3068\u5bfe\u8c61\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3084\u30b7\u30b0\u30ca\u30eb\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u306e XML \u8868\u73fe\u304c\u8fd4\u3055\u308c\u307e\u3059\u3002\u672c\u7a3f\u3067\u306f\u3053\u306e Introspect \u306b\u30d5\u30a9\u30fc\u30ab\u30b9\u3057\u3001\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u30b7\u30b0\u30ca\u30eb\u306b\u3064\u3044\u3066\u306f\u53d6\u308a\u4e0a\u3052\u307e\u305b\u3093\u3002<\/p>\n

D-Bus \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u306e\u901a\u4fe1\u306b\u3042\u305f\u3063\u3066 2 \u3064\u306e\u30c4\u30fc\u30eb\u3092\u5229\u7528\u3057\u307e\u3057\u305f\u30021 \u3064\u306f gdbus<\/strong> \u3068\u3044\u3046 CLI \u30c4\u30fc\u30eb\u3067\u3001\u3053\u308c\u3092\u4f7f\u3048\u3070\u30b9\u30af\u30ea\u30d7\u30c8\u5185\u304b\u3089 D-Bus \u306b\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u7c21\u5358\u306b\u547c\u3073\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3082\u3046 1 \u3064\u306f D-Feet<\/strong><\/a> \u3068\u3044\u3046 Python \u30d9\u30fc\u30b9\u306e GUI \u30c4\u30fc\u30eb\u3067\u3001\u5404\u30d0\u30b9\u3067\u5229\u7528\u53ef\u80fd\u306a\u30b5\u30fc\u30d3\u30b9\u3092\u5217\u6319\u3057\u3001\u5404\u30b5\u30fc\u30d3\u30b9\u306b\u542b\u307e\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u78ba\u8a8d\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u56f3 1 D-Feet \u306e\u30e1\u30a4\u30f3\u753b\u9762<\/em><\/span><\/p>\n

<\/p>\n

\u56f3 2 D-Feet \u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u753b\u9762<\/em><\/span><\/p>\n

D-Feet \u306f\u512a\u308c\u305f\u30c4\u30fc\u30eb\u3067\u3001\u4eca\u56de\u306e\u8abf\u67fb\u306b\u4e0d\u53ef\u6b20\u306a\u30c4\u30fc\u30eb\u3067\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3002\u56f3 1 \u306e\u5de6\u30da\u30a4\u30f3\u306b\u306f\u3001D-Bus \u30c7\u30fc\u30e2\u30f3\u306e\u30b7\u30b9\u30c6\u30e0 \u30d0\u30b9\u306b\u767b\u9332\u3055\u308c\u3066\u3044\u308b\u3055\u307e\u3056\u307e\u306a\u30b5\u30fc\u30d3\u30b9\u304c\u3059\u3079\u3066\u8868\u793a\u3055\u308c\u3066\u3044\u307e\u3059\uff08\u4e0a\u90e8\u306b\u3042\u308b [System Bus] \u306e\u9078\u629e\u30dc\u30bf\u30f3\u306b\u6ce8\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\uff09\u3002org.debin.apt<\/strong> \u3092\u9078\u629e\u3059\u308b\u3068\u3001D-Feet \u306f\u81ea\u52d5\u7684\u306b\u5f53\u8a72\u30b5\u30fc\u30d3\u30b9\u3067\u5229\u7528\u53ef\u80fd\u306a\u3059\u3079\u3066\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u554f\u3044\u5408\u308f\u305b\u307e\u3059\u3002\u7279\u5b9a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9078\u629e\u3059\u308c\u3070\u3001\u3059\u3079\u3066\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9 \u30bb\u30c3\u30c8\u3068\u3001\u305d\u308c\u305e\u308c\u306e\u30bb\u30c3\u30c8\u306b\u4ed8\u968f\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u30b7\u30b0\u30ca\u30eb\u304c\u4e00\u89a7\u8868\u793a\u3055\u308c\u307e\u3059(\u56f3 2 \u53c2\u7167)\u3002\u3053\u3053\u3067\u306f\u3001\u5404 IPC \u306b\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u306e\u30b7\u30b0\u30cd\u30c1\u30e3\u3082\u5408\u308f\u305b\u3066\u53d6\u5f97\u3057\u3066\u3044\u308b\u70b9\u306b\u7740\u76ee\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

\u307e\u305f\u3001\u5404\u30b5\u30fc\u30d3\u30b9\u3092\u30db\u30b9\u30c8\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u306e PID \u3084\u30b3\u30de\u30f3\u30c9\u30e9\u30a4\u30f3\u3082\u8868\u793a\u3055\u308c\u307e\u3059\u304c\u3001\u3053\u308c\u306f\u975e\u5e38\u306b\u4fbf\u5229\u306a\u6a5f\u80fd\u3067\u3001\u3053\u308c\u3092\u4f7f\u3048\u3070\u8abf\u67fb\u5bfe\u8c61\u30b5\u30fc\u30d3\u30b9\u304c\u5b9f\u969b\u306b\u3088\u308a\u9ad8\u3044\u7279\u6a29\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u691c\u8a3c\u3067\u304d\u307e\u3059\u3002\u30b7\u30b9\u30c6\u30e0 \u30d0\u30b9\u4e0a\u306e\u30b5\u30fc\u30d3\u30b9\u306e\u4e2d\u306b\u306f\u3001root \u3068\u3057\u3066\u5b9f\u884c\u3055\u308c\u306a\u3044\u3082\u306e\u3082\u3042\u308a\u3001\u305d\u3046\u3057\u305f\u30b5\u30fc\u30d3\u30b9\u306f\u8abf\u67fb\u4e0a\u3055\u307b\u3069\u8208\u5473\u3092\u5f15\u304f\u3082\u306e\u3067\u306f\u306a\u3044\u304b\u3089\u3067\u3059\u3002<\/p>\n

\u3055\u3089\u306b D-Feet \u3067\u306f\u3001\u3055\u307e\u3056\u307e\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9\u5165\u529b\u753b\u9762\u3067\u306f\u3001\u30ab\u30f3\u30de\u533a\u5207\u308a\u3067 Python \u5f0f\u306e\u30ea\u30b9\u30c8\u3092\u6307\u5b9a\u3057\u3001\u305d\u308c\u3089\u3092\u547c\u3073\u51fa\u3057\u5148\u95a2\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u3057\u3066\u89e3\u91c8\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059 (\u56f3 3 \u53c2\u7167)\u3002Python \u306e\u578b\u306f D-Bus \u578b\u306b\u30de\u30fc\u30b7\u30e3\u30ea\u30f3\u30b0\u3055\u308c\u3001\u30b5\u30fc\u30d3\u30b9\u306b\u6e21\u3055\u308c\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u56f3 3 D-Feet \u7d4c\u7531\u3067 D-Bus \u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059<\/em><\/span><\/p>\n

\u30e1\u30bd\u30c3\u30c9\u306e\u306a\u304b\u306b\u306f\u547c\u3073\u51fa\u3057\u3092\u8a31\u53ef\u3059\u308b\u305f\u3081\u306b\u4e8b\u524d\u306e\u8a8d\u8a3c\u304c\u5fc5\u8981\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u3053\u3053\u3067\u306e\u76ee\u6a19\u306f\u305d\u3082\u305d\u3082\u8cc7\u683c\u60c5\u5831\u306a\u3057\u3067\u7279\u6a29\u6607\u683c\u3059\u308b\u3053\u3068\u306a\u306e\u3067\u3001\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u3064\u3044\u3066\u306f\u53d6\u308a\u4e0a\u3052\u307e\u305b\u3093\u3002<\/p>\n

<\/p>\n

\u56f3 4 \u8a8d\u53ef\u304c\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9<\/em><\/span><\/p>\n

\u307e\u305f\u3001\u30b5\u30fc\u30d3\u30b9\u306b\u3088\u3063\u3066\u306f\u3001org.freedeskto.PolicyKit1 \u3068\u3044\u3046\u540d\u524d\u306e\u5225\u306e D-Bus \u30b5\u30fc\u30d3\u30b9\u306b\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u3044\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u7279\u5b9a\u306e\u64cd\u4f5c\u306e\u5b9f\u884c\u3092\u8a31\u53ef\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002 \u3053\u306e org.freedeskto.PolicyKit1 (polkit) \u30b5\u30fc\u30d3\u30b9\u306b\u3064\u3044\u3066\u306f\u5f8c\u3067\u307e\u305f\u53d6\u308a\u4e0a\u3052\u307e\u3059\u3002<\/p>\n

<\/a>\u8106\u5f31\u6027<\/h3>\n

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\u8106\u5f31\u6027\u306e\u898b\u3064\u304b\u3063\u305f\u30b5\u30fc\u30d3\u30b9\u306f com.ubuntu.USBCreator<\/strong> \u3067\u3059\u3002\/com\/ubuntu\/USBCreator<\/strong> \u3067\u8868\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4e0b\u306b Image \u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001Ubuntu \u306e USB Creator \u30c4\u30fc\u30eb\u304c\u5185\u90e8\u7684\u306b\u5229\u7528\u3059\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n

<\/p>\n

\u56f3 5 com.ubuntu.USBCreator \u30b5\u30fc\u30d3\u30b9<\/em><\/p>\n

 <\/p>\n

<\/p>\n

\u56f3 6 \/com\/ubuntu\/USBCreator \u306e Image \u30e1\u30bd\u30c3\u30c9<\/em><\/span><\/p>\n

\u8abf\u3079\u3066\u307f\u308b\u3068\u3001\u3053\u306e\u30b5\u30fc\u30d3\u30b9\u306b\u306f\u7279\u6a29\u304c\u3042\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n

<\/p>\n

\u56f3 7 \u30b5\u30fc\u30d3\u30b9\u304c\u7279\u6a29\u3092\u6301\u3064\u3053\u3068\u304c\u5206\u304b\u308b<\/em><\/span><\/p>\n

\u3053\u306e\u30b5\u30fc\u30d3\u30b9\u306f Python \u3067\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u95a2\u9023\u3059\u308b\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u7c21\u5358\u306b\u8abf\u3079\u3089\u308c\u307e\u3059\u3002\u307e\u305a\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u5bfe\u8a71\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u7279\u6a29\u306fcom.ubuntu.usbcreator.image \u3067\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304b\u3089\u306f\u3001\u8981\u6c42\u3057\u3066\u3044\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u3053\u306e\u8981\u6c42\u304c\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306b\u3064\u3044\u3066\u3001polkit \u306b\u554f\u3044\u5408\u308f\u305b\u304c\u884c\u308f\u308c\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\uff08172\u884c\u76ee\uff09\u3002<\/p>\n

<\/p>\n

\u56f3 8 USBCreator \u306e\u30bd\u30fc\u30b9 \u30b3\u30fc\u30c9<\/em><\/span><\/p>\n

polkit \u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3068\u3001\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u5bfe\u8a71\u3092\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u306e\u306f Unix \u30b0\u30eb\u30fc\u30d7 sudo \u3067\u3042\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3059\uff08\u56f3 9 \u53c2\u7167\uff09\u3002\u5f53\u8a72\u30d5\u30a1\u30a4\u30eb\u306f \/var\/lib\/polkit-1\/localauthority \u306e\u4e0b\u306b\u3042\u308a\u307e\u3059\u3002\u3088\u308a\u5177\u4f53\u7684\u306b\u306f\u3001\u79c1\u305f\u3061\u304c\u8abf\u3079\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\u306f \/var\/lib\/polkit-1\/localauthority\/10-vendor.d\/com.ubuntu.desktop.pkla \u3067\u3059\u3002<\/p>\n

<\/p>\n

\u56f3 9 26 \u884c\u76ee\u304b\u3089\u59cb\u307e\u308b\u30bb\u30af\u30b7\u30e7\u30f3\u3067 com.ubuntu.usbcreator.image \u30e1\u30bd\u30c3\u30c9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u53ef\u3059\u308b\u30b0\u30eb\u30fc\u30d7\u304c\u6307\u5b9a\u3055\u308c\u3066\u3044\u308b<\/em><\/span><\/p>\n

\u5f53\u8a72\u30b5\u30fc\u30d3\u30b9\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3092\u8abf\u3079\u308b\u3068\u3001Unix \u30c4\u30fc\u30eb dd \u306e Python \u306b\u3088\u308b\u5b9f\u88c5\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002\u3053\u306e\u30c4\u30fc\u30eb\u306e\u7528\u9014\u306f\u3044\u308d\u3044\u308d\u3042\u308a\u307e\u3059\u304c\u3001\u7570\u306a\u308b\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u9593\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306b\u3082\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30e1\u30bd\u30c3\u30c9 _builtin_dd \u3078\u306e\u5165\u529b\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u304b\u3089\u76f4\u63a5\u53d6\u5f97\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3055\u3089\u306b\u3001\u30bd\u30fc\u30b9 \u30d1\u30b9\u3001\u30bf\u30fc\u30b2\u30c3\u30c8 \u30d1\u30b9\u306e\u3044\u305a\u308c\u306b\u304a\u3044\u3066\u3082\u30d1\u30b9\u306e\u30b5\u30cb\u30bf\u30a4\u30ba \u30c1\u30a7\u30c3\u30af\u304c\u884c\u308f\u308c\u3066\u304a\u3089\u305a\u3001\u30d1\u30b9\u30ef\u30fc\u30c9 \u30d7\u30ed\u30f3\u30d7\u30c8\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u3053\u308c\u306b\u3088\u308a\u30e6\u30fc\u30b6\u30fc\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u4e0a\u306e\u4efb\u610f\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u30d1\u30b9\u30ef\u30fc\u30c9\u5165\u529b\u3092\u6c42\u3081\u3089\u308c\u308b\u3053\u3068\u306a\u304f root \u3068\u3057\u3066\u4e0a\u66f8\u304d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff08\u56f3 10 \u53c2\u7167\uff09\u3002<\/p>\n

<\/p>\n

\u56f3 10 \u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5165\u529b\u3059\u308b\u3053\u3068\u306a\u304f root \u3068\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210<\/em><\/span><\/p>\n

\u7d50\u8ad6<\/h2>\n

\u3053\u306e\u8106\u5f31\u6027\u304c\u5b9f\u969b\u306b\u60aa\u7528\u3055\u308c\u305f\u3053\u3068\u306f\u78ba\u8a8d\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u30026 \u6708 18 \u65e5\u306b\u672c\u8106\u5f31\u6027\u306b\u5bfe\u3059\u308b\u30d1\u30c3\u30c1\u3092\u30ea\u30ea\u30fc\u30b9\u3057\u3066\u4ee5\u964d\u3001Ubuntu \u306f USBCreator \u8d77\u52d5\u306b\u30d1\u30b9\u30ef\u30fc\u30c9\u8a8d\u8a3c\u3092\u8981\u6c42\u3057\u307e\u3059\u3002\u30d1\u30ed\u30a2\u30eb\u30c8\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30b9\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8 \u30d7\u30ed\u30c6\u30af\u30b7\u30e7\u30f3\u3068\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u63d0\u4f9b\u3059\u308b\u88fd\u54c1 Traps \u306f\u3001Behavioral Threat Protection (BTP: \u632f\u308b\u821e\u3044\u5206\u6790\u306b\u3088\u308b\u8105\u5a01\u9632\u6b62) \u306e\u4ed5\u7d44\u307f\u3092\u4f7f\u3044\u3001\u672c\u8106\u5f31\u6027\u306e\u60aa\u7528\u3092\u963b\u6b62\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u6982\u8981 USBCreator D-Bus \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u8106\u5f31\u6027\u306b\u3088\u308a\u3001sudoer \u30b0\u30eb\u30fc\u30d7\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u653b\u6483\u8005\u306f\u3001sudo \u30d7\u30ed\u30b0\u30e9\u30e0\u306b\u8ab2\u3055\u308c\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30dd\u30ea\u30b7\u30fc\u3092\u56de\u907f\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u3053<\/p>\n","protected":false},"author":199,"featured_media":99173,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4469,4428,4470],"tags":[4553,4791,6626],"product_categories":[],"coauthors":[1202],"class_list":["post-102272","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vulnerabilities","category-threat-research-ja","category-vulnerabilities-ja","tag-linux-ja","tag-privilege-escalation-ja","tag-ubuntu"],"yoast_head":"\nUbuntu \u30c7\u30b9\u30af\u30c8\u30c3\u30d7 USBCreator D-Bus \u306e\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027\u306e\u89e3\u8aac<\/title>\n<meta name=\"description\" content=\"\u672c\u7a3f\u306fUbuntu\u30c7\u30b9\u30af\u30c8\u30c3\u30d7USBCreator D-Bus\u306e\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u306e\u89e3\u8aac\u8a18\u4e8b\u3067\u3059\u3002\u540c\u8106\u5f31\u6027\u304c\u60aa\u7528\u3055\u308c\u308b\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5165\u529b\u305b\u305a\u306broot\u3068\u3057\u3066\u4efb\u610f\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4efb\u610f\u306e\u5185\u5bb9\u3067\u4e0a\u66f8\u304d\u53ef\u80fd\u3067\u3059\u3002\u554f\u984c\u306fUbuntu\u304c\u5bfe\u5fdc\u95a2\u9023\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u4fee\u6b63\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3066\u89e3\u6c7a\u6e08\u307f\u3067\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/unit42.paloaltonetworks.com\/ja\/usbcreator-d-bus-privilege-escalation-in-ubuntu-desktop\/\" \/>\n<meta property=\"og:locale\" content=\"ja_JP\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ubuntu \u30c7\u30b9\u30af\u30c8\u30c3\u30d7 USBCreator D-Bus \u306e\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027\u306e\u89e3\u8aac\" \/>\n<meta property=\"og:description\" content=\"\u672c\u7a3f\u306fUbuntu\u30c7\u30b9\u30af\u30c8\u30c3\u30d7USBCreator D-Bus\u306e\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u306e\u89e3\u8aac\u8a18\u4e8b\u3067\u3059\u3002\u540c\u8106\u5f31\u6027\u304c\u60aa\u7528\u3055\u308c\u308b\u3068\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5165\u529b\u305b\u305a\u306broot\u3068\u3057\u3066\u4efb\u610f\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4efb\u610f\u306e\u5185\u5bb9\u3067\u4e0a\u66f8\u304d\u53ef\u80fd\u3067\u3059\u3002\u554f\u984c\u306fUbuntu\u304c\u5bfe\u5fdc\u95a2\u9023\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u4fee\u6b63\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3066\u89e3\u6c7a\u6e08\u307f\u3067\u3059\u3002\" \/>\n<meta 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