{"id":122221,"date":"2022-03-03T17:09:58","date_gmt":"2022-03-04T01:09:58","guid":{"rendered":"https:\/\/unit42.paloaltonetworks.com\/?p=122221"},"modified":"2022-03-07T16:41:27","modified_gmt":"2022-03-08T00:41:27","slug":"cve-2022-0492-cgroups","status":"publish","type":"post","link":"https:\/\/unit42.paloaltonetworks.com\/ja\/cve-2022-0492-cgroups\/","title":{"rendered":"cgroups\u306b\u5f71\u97ff\u3059\u308bLinux\u306e\u65b0\u305f\u306a\u8106\u5f31\u6027CVE-2022-0492 \u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u306e\u6761\u4ef6\u306f"},"content":{"rendered":"

\u6982\u8981<\/strong><\/h2>\n

2022\u5e742\u67084\u65e5\u3001Linux\u306f\u30ab\u30fc\u30cd\u30eb\u306b\u304a\u3051\u308b\u65b0\u305f\u306a\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027CVE-2022-0492<\/a>\u3092\u516c\u8868\u3057\u307e\u3057\u305f\u3002CVE-2022-0492\u306f\u30b3\u30f3\u30c6\u30ca\u306e\u57fa\u672c\u69cb\u6210\u8981\u7d20\u3067\u3042\u308bLinux\u306e\u6a5f\u80fd\u3001\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30b0\u30eb\u30fc\u30d7(cgroup<\/a>)\u306b\u304a\u3051\u308b\u8ad6\u7406\u30d0\u30b0\u3067\u3059\u3002\u3053\u306e\u554f\u984c\u306f\u6700\u8fd1\u767a\u898b\u3055\u308c\u305fLinux\u306e\u6a29\u9650\u6607\u683c\u8106\u5f31\u6027\u306e\u306a\u304b\u3067\u3082\u3068\u308a\u308f\u3051\u305d\u306e\u5358\u7d14\u3055\u3067\u304d\u308f\u3060\u3064\u3082\u306e\u3067\u3001\u300cLinux\u30ab\u30fc\u30cd\u30eb\u304c\u8aa4\u3063\u3066\u7279\u6a29\u7684\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u975e\u7279\u6a29\u30e6\u30fc\u30b6\u30fc\u306b\u516c\u958b\u3057\u3066\u3057\u307e\u3063\u305f\u300d\u3068\u3044\u3046\u5185\u5bb9\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n

\u3055\u3044\u308f\u3044\u3001\u307b\u3068\u3093\u3069\u306e\u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30cf\u30fc\u30c9\u30cb\u30f3\u30b0\u306f\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u9632\u6b62\u306b\u306f\u5341\u5206\u306a\u3082\u306e\u3067\u3059\u3002AppArmor\u3001SELinux\u3001Seccomp\u306e\u3044\u305a\u308c\u304b\u3092\u6709\u52b9\u306b\u3057\u3066\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306f\u4fdd\u8b77\u3055\u308c\u307e\u3059\u3002\u3068\u306f\u3044\u3048\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306e\u30cf\u30fc\u30c9\u30cb\u30f3\u30b0\u3092\u884c\u308f\u305a\u306b\u30b3\u30f3\u30c6\u30ca\u3092\u5b9f\u884c\u3057\u3066\u3044\u305f\u308a\u3001\u7279\u6a29\u3092\u8ffd\u52a0\u4ed8\u4e0e\u3057\u3066\u5b9f\u884c\u3057\u305f\u308a\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u30ea\u30b9\u30af\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u300c\u5f71\u97ff\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f<\/a>\u300d\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u3001\u8106\u5f31\u306a\u30b3\u30f3\u30c6\u30ca\u69cb\u6210\u306e\u4e00\u89a7\u3068\u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u304c\u8106\u5f31\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c6\u30b9\u30c8\u3059\u308b\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n

Unit 42\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u7686\u3055\u3093\u306b\u4fee\u6b63\u6e08\u307f\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u3078\u306e\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3092\u63a8\u5968\u3057\u307e\u3059\u3002\u30b3\u30f3\u30c6\u30ca\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001Seccomp\u3092\u6709\u52b9\u306b\u3057\u3001AppArmor\u307e\u305f\u306fSELinux\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002Prisma Cloud\u3092\u304a\u4f7f\u3044\u306e\u304a\u5ba2\u69d8\u306f\u300cPrisma Cloud\u306b\u3088\u308b\u4fdd\u8b77<\/a>\u300d\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067Prisma Cloud\u306e\u63d0\u4f9b\u3059\u308b\u7de9\u548c\u7b56\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n

CVE-2022-0492\u306f\u3001\u60aa\u610f\u306e\u3042\u308b\u30b3\u30f3\u30c6\u30ca\u304c\u30a8\u30b9\u30b1\u30fc\u30d7\u3067\u304d\u308b\u30ab\u30fc\u30cd\u30eb\u306e\u8106\u5f31\u6027\u3068\u3057\u3066\u3053\u3053\u6570\u30ab\u6708\u3067<\/a>3\u3064\u76ee\u306e\u8106\u5f31\u6027\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u30893\u3064\u306e\u8106\u5f31\u6027\u306f\u3044\u305a\u308c\u3082\u3001Seccomp\u3068AppArmor\/SELinux\u306e\u3069\u3061\u3089\u304b\u3092\u6709\u52b9\u306b\u3057\u3066\u30b3\u30f3\u30c6\u30ca\u3092\u4fdd\u8b77\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u3092\u9632\u6b62\u3067\u304d\u307e\u3059\u3002<\/p>\n

2022-03-07 (\u7c73\u56fd\u6642\u9593) \u306e\u66f4\u65b0<\/strong>: \u300c(1) CAP_SYS_ADMIN<\/span>\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3064\u304d\u3067\u7a3c\u50cd\u3057\u3066\u304a\u308aAppArmor\u3001SELinux\u306e\u3044\u305a\u308c\u306b\u3088\u3063\u3066\u3082\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30b3\u30f3\u30c6\u30ca\u306b\u3088\u308b\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u300d\u3001\u300c(2) \u7279\u6a29\u306b\u6e96\u305a\u308b\u6a29\u9650\u3092\u3082\u3064\u30db\u30b9\u30c8\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308b\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u300d\u306b\u95a2\u3059\u308b\u8a00\u53ca\u3092\u524a\u9664\u3057\u307e\u3057\u305f\u3002\u305f\u3057\u304b\u306b\u3053\u308c\u3089\u306fCVE-2022-0492\u3092\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u3057\u3066\u7279\u6a29\u3092\u6607\u683c\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u304c\u3001\u3053\u308c\u3089\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u3042\u308c\u3070\u3068\u304f\u306b\u8106\u5f31\u6027\u304c\u306a\u304f\u3066\u3082\u307b\u304b\u306b\u7279\u6a29\u6607\u683c\u3059\u308b\u65b9\u6cd5\u304c\u3042\u308b\u3053\u3068\u304c\u591a\u3044\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n\n\n
\u672c\u7a3f\u3067\u6271\u3046\u8106\u5f31\u6027<\/span><\/td>\nCVE-2022-0492<\/span><\/a><\/td>\n<\/tr>\n
\u5f71\u97ff\u3092\u53d7\u3051\u308b\u88fd\u54c1<\/span><\/td>\nLinux<\/span><\/td>\n<\/tr>\n
Unit 42\u306e\u95a2\u9023\u30c8\u30d4\u30c3\u30af<\/span><\/td>\nContainer Escape<\/span><\/a>, <\/span>Cloud<\/span><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u76ee\u6b21<\/strong><\/h2>\n

cgroup\u306e\u80cc\u666f<\/a>
\n\u6839\u672c\u539f\u56e0\u306e\u89e3\u6790 - CVE-2022-0492<\/a>
\n\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u306e\u524d\u63d0\u6761\u4ef6<\/a>
\n\u591a\u5c64\u9632\u5fa1\u306e\u52dd\u5229 - \u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u306e\u524d\u63d0\u6761\u4ef6<\/a>
\n\u5f71\u97ff\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f<\/a>
\n\u56de\u907f\u30fb\u7de9\u548c\u7b56<\/a>
\nPrisma Cloud\u306b\u3088\u308b\u4fdd\u8b77<\/a>
\n\u7d50\u8ad6<\/a><\/p>\n

<\/a>cgroup\u306e\u80cc\u666f <\/strong><\/h2>\n

\u300c\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30b0\u30eb\u30fc\u30d7(cgroup)\u300d\u3068\u3044\u3046\u306e\u306fLinux\u306e\u6a5f\u80fd\u306e1\u3064\u3067\u3001\u3053\u308c\u3092\u4f7f\u3046\u3053\u3068\u3067\u7ba1\u7406\u8005\u306f\u3042\u308b\u3072\u3068\u307e\u3068\u307e\u308a\u306e\u30d7\u30ed\u30bb\u30b9\u306e\u30ea\u30bd\u30fc\u30b9\u4f7f\u7528\u3092\u5236\u9650\u30fb\u8aac\u660e\u30fb\u9694\u96e2\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002Linux\u306fv1\u3068v2\u3068\u3044\u30462\u3064\u306ecgroup\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u3066\u3001\u4eca\u56de\u306e\u8106\u5f31\u6027\u306fv1\u306ecgroup\u306e\u307f\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002\u306a\u304a\u73fe\u5728\u306fv1\u306e\u307b\u3046\u304c\u305a\u3063\u3068\u5e83\u304f\u5229\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u672c\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u6b8b\u308a\u306e\u90e8\u5206\u306f\u3053\u306ev1\u3068\u3044\u3046cgroup\u306e\u307f\u306b\u3064\u3044\u3066\u8a00\u53ca\u3057\u307e\u3059\u3002<\/p>\n

cgroup\u306fcgroupfs\u7d4c\u7531\u3067\u7ba1\u7406\u3057\u307e\u3059\u3002cgroupfs\u3068\u3044\u3046\u306e\u306f\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u3068\u3057\u3066\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u7ba1\u7406API\u3067\u3001\u901a\u5e38\u306f\/sys\/fs\/cgroup<\/span>\u4e0b\u306b\u30de\u30a6\u30f3\u30c8\u3055\u308c\u307e\u3059\u3002\u30de\u30a6\u30f3\u30c8\u3055\u308c\u305fcgroupfs\u306b\u30d5\u30a1\u30a4\u30eb\u3084\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u6210\u3057\u305f\u308a\u66f8\u304d\u8fbc\u3093\u3060\u308a\u3059\u308b\u3053\u3068\u3067\u3001\u7ba1\u7406\u8005\u306fcgroup\u3092\u4f5c\u6210\u3057\u305f\u308a\u3001cgroup\u306b\u8a2d\u5b9a\u3059\u308b\u5236\u9650\u3092\u5236\u5fa1\u3057\u305f\u308a\u3001\u3042\u308bcgroup\u306b\u30d7\u30ed\u30bb\u30b9\u3092\u8ffd\u52a0\u3057\u305f\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n

cgroup\u306f\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306b\u5206\u304b\u308c\u3066\u3044\u3066\u3001\u305d\u308c\u305e\u308c\u306e\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u304c\u7570\u306a\u308b\u30ea\u30bd\u30fc\u30b9\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3068\u3048\u3070memory\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u3042\u308b\u3072\u3068\u307e\u3068\u307e\u308a\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u5bfe\u3059\u308b\u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u4e0a\u9650\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002devices\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306f\u3001\u305d\u306ecgroup\u5185\u306e\u30d7\u30ed\u30bb\u30b9\u304b\u3089\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306a\u30c7\u30d0\u30a4\u30b9(\u30cf\u30fc\u30c9\u30c9\u30e9\u30a4\u30d6\u3084\u30de\u30a6\u30b9\u306a\u3069)\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002\u3053\u306e\u307b\u304b\u306e\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306e\u4f8b\u3068\u3057\u3066\u306f\u3001blkio (Block IO)\u3001cpu\u3001rdma (Remote Direct Memory Access)\u306a\u3069\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5404\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306f\u901a\u5e38\u3001\/sys\/fs\/cgroup\/<subsystem><\/span>\u306b\u30de\u30a6\u30f3\u30c8\u3055\u308c\u3001\u3053\u308c\u304c\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306eroot cgroup\u3068\u307f\u306a\u3055\u308c\u307e\u3059\u3002root cgroup\u4e0b\u306e\u30b5\u30d6\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u304c\u65b0\u3057\u3044\u5b50cgroup\u3092\u8868\u3057\u307e\u3059\u3002\u305f\u3068\u3048\u3070\u3001Docker\u30b3\u30f3\u30c6\u30ca\u306f\u901a\u5e38\u3001\/docker\/<ctr-id> cgroup\u306e<\/span><\/span>\u4e00\u90e8\u306b\u306a\u3063\u3066\u3044\u3066\u3001\u30db\u30b9\u30c8\u4e0a\u3067\u306f\/sys\/fs\/cgroup\/<subsystem>\/docker\/<ctr-id><\/span>\u3067\u898b\u3064\u304b\u308a\u307e\u3059\u3002\u56f31\u306fDocker\u30b3\u30f3\u30c6\u30ca\u306ecgroup\u30e1\u30f3\u30d0\u30fc\u3092\u793a\u3057\u305f\u3082\u306e\u3067\u3001\u56f32\u306fKubernetes\u30dd\u30c3\u30c9\u306ecgroup\u30e1\u30f3\u30d0\u30fc\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

\"Docker\u30b3\u30f3\u30c6\u30ca\u5185\u306e\u30d7\u30ed\u30bb\u30b9\u7fa4\u306ecgroup\u30e1\u30f3\u30d0\u30fc\"
\u56f31 Docker\u30b3\u30f3\u30c6\u30ca\u5185\u306e\u30d7\u30ed\u30bb\u30b9\u7fa4\u306ecgroup\u30e1\u30f3\u30d0\u30fc<\/figcaption><\/figure>\n
\"Kubernetes\u30dd\u30c3\u30c9\u5185\u306e\u30d7\u30ed\u30bb\u30b9\u7fa4\u306ecgroup\u30e1\u30f3\u30d0\u30fc\"
\u56f32. Kubernetes\u30dd\u30c3\u30c9\u5185\u306e\u30d7\u30ed\u30bb\u30b9\u7fa4\u306ecgroup\u30e1\u30f3\u30d0\u30fc<\/figcaption><\/figure>\n

\u4e0a\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u304b\u3089\u3082\u308f\u304b\u308b\u3068\u304a\u308a\u3001\u3059\u3079\u3066\u306e\u30db\u30b9\u30c8\u304c\u540c\u3058\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3092\u30b5\u30dd\u30fc\u30c8\u3059\u308b\u3088\u3046\u306b\u69cb\u6210\u3055\u308c\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002Docker\u3084Kubernetes\u306b\u3082\u3055\u307e\u3056\u307e\u306acgroup\u306e\u69cb\u6210\u304c\u3042\u308b\u305f\u3081\u3001\u304a\u4f7f\u3044\u306e\u30db\u30b9\u30c8\u3084\u30af\u30e9\u30b9\u30bf\u4e0a\u306e\u30b3\u30f3\u30c6\u30ca\u304c\u4e0a\u306e\u4f8b\u3068\u540c\u3058\u5185\u5bb9\u306b\u306f\u306a\u3089\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

<\/a>\u6839\u672c\u539f\u56e0\u306e\u89e3\u6790 - CVE-2022-0492 <\/strong><\/h2>\n

cgroups v1 \u306e\u7279\u5fb4\u306e1\u3064\u306brelease_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u304c\u3042\u308a\u307e\u3059\u3002\u7ba1\u7406\u8005\u306f\u3053\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u3063\u3066\u3001cgroup\u5185\u306e\u30d7\u30ed\u30bb\u30b9\u306e\u7d42\u4e86\u6642\u306b\u5b9f\u884c\u3055\u308c\u308b\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u8a2d\u5b9a\u306f\u3001release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u306b\u5e0c\u671b\u3059\u308b\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3078\u306e\u30d1\u30b9\u3092\u66f8\u304d\u8fbc\u3080\u3053\u3068\u3067\u5b9f\u884c\u3057\u307e\u3059(\u4ee5\u4e0b\u53c2\u7167)\u3002<\/p>\n

$ echo \/bin\/my-release-agent > \/sys\/fs\/cgroup\/memory\/release_agent<\/span><\/p>\n

release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u306f\u3001root cgroup\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u5185\u304b\u3089\u306e\u307f\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u3059\u3079\u3066\u306e\u5b50cgroup\u306b\u5f71\u97ff\u3057\u307e\u3059\u3002\u305d\u308c\u305e\u308c\u306e\u5b50cgroup\u3067\u306f\u3001notify_on_release<\/span>\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304d\u8fbc\u3080\u3053\u3068\u3067(\u5b50\u30d7\u30ed\u30bb\u30b9\u306e1\u3064\u304c\u7d42\u4e86\u3057\u305f\u3068\u304d\u306b)\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3092\u8d77\u52d5\u3059\u308b\u304b\u3057\u306a\u3044\u304b\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30b3\u30de\u30f3\u30c9\u306f\u3001a_child_cgroup<\/span>\u3068\u3044\u3046cgroup\u306b\u5bfe\u3057\u3066notify_on_release<\/span>\u6a5f\u80fd\u3092\u6709\u52b9\u306b\u3057\u307e\u3059\u3002<\/p>\n

$ echo 1 > \/sys\/fs\/cgroup\/memory\/a_child_cgroup\/notify_on_release<\/span><\/p>\n

\u30d7\u30ed\u30bb\u30b9\u304c\u7d42\u4e86\u3059\u308b\u3068\u3001\u30ab\u30fc\u30cd\u30eb\u306f\u305d\u306ecgroup\u304cnotify_on_release<\/span>\u3092\u6709\u52b9\u306b\u3057\u3066\u3044\u305f\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3001\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308c\u3070\u3001\u8a2d\u5b9a\u3055\u308c\u305frelease_agent<\/span>\u30d0\u30a4\u30ca\u30ea\u3092\u8d77\u52d5\u3057\u307e\u3059\u3002\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u306f\u6700\u3082\u9ad8\u3044\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u3067\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002\u305d\u308c\u306f\u3064\u307e\u308a\u3001\u521d\u671f\u540d\u524d\u7a7a\u9593\u3067\u3059\u3079\u3066\u306e\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3092\u6301\u3064root\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u3002\u3067\u3059\u306e\u3067\u3001\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u306e\u8a2d\u5b9a\u306f\u3001\u5b8c\u5168\u306aroot\u6a29\u9650\u3067\u3069\u306e\u30d0\u30a4\u30ca\u30ea\u3092\u5b9f\u884c\u3059\u308b\u304b\u3092\u6c7a\u5b9a\u3067\u304d\u308b\u3053\u3068\u304b\u3089\u3001\u7279\u6a29\u7684\u64cd\u4f5c\u3067\u3042\u308b\u3068\u307f\u306a\u3055\u308c\u307e\u3059\u3002<\/p>\n

CVE-2022-0492\u306f\u691c\u8a3c\u306e\u6b20\u843d\u306b\u8d77\u56e0\u3057\u3066\u3044\u307e\u3059\u3002\u5358\u7d14\u306bLinux\u306f\u3001release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u3092\u8a2d\u5b9a\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u306b\u7ba1\u7406\u8005\u6a29\u9650(CAP_SYS_ADMIN<\/span>\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3)\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u306a\u304b\u3063\u305f\u3001\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002CVE-2022-0492\u306e\u30d1\u30c3\u30c1(\u4ee5\u4e0b\u306e2-8\u884c\u76ee)\u304c\u975e\u5e38\u306b\u77ed\u3044\u3053\u3068\u304c\u3053\u306e\u8106\u5f31\u6027\u306e\u5358\u7d14\u3055\u3092\u3088\u304f\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n

<\/p>\n

@@ -549,6 +549,14 @@ static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of,\r\n+\t\/*\r\n+\t * Release agent gets called with all capabilities,\r\n+\t * require capabilities to set release agent.\r\n+\t *\/\r\n+\tif ((of->file->f_cred->user_ns != &init_user_ns) ||\r\n+\t    !capable(CAP_SYS_ADMIN))\r\n+\t\treturn -EPERM;<\/pre>\n
<\/p>\n
<\/a>\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u306e\u524d\u63d0\u6761\u4ef6<\/strong><\/h2>\n
\u5148\u306b\u8ff0\u3079\u305f\u3068\u304a\u308a\u3001release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u66f8\u304d\u8fbc\u307f\u304c\u3067\u304d\u308c\u3070\u3001\u30ab\u30fc\u30cd\u30eb\u306b\u5f37\u5236\u7684\u306b\u81ea\u5206\u306e\u9078\u3093\u3060\u30d0\u30a4\u30ca\u30ea\u3092\u6607\u683c\u3057\u305f\u7279\u6a29\u3067\u8d77\u52d5\u3055\u305b\u3001\u30de\u30b7\u30f3\u5168\u4f53\u3092\u5236\u5fa1\u3067\u304d\u307e\u3059\u3002\u3067\u306f\u8106\u5f31\u306a\u30de\u30b7\u30f3\u4e0a\u3067\u8ab0\u304crelease_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304d\u8fbc\u3081\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002\u30ab\u30fc\u30cd\u30eb\u306f\u66f8\u304d\u8fbc\u307f\u30d7\u30ed\u30bb\u30b9\u306e\u6a29\u9650\u3092\u660e\u793a\u7684\u306b\u306f\u30c1\u30a7\u30c3\u30af\u3057\u307e\u305b\u3093\u304c\u3001\u901a\u5e38\u306e\u30d5\u30a1\u30a4\u30eb\u6240\u6709\u6a29\u3068\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u306e\u89e3\u91c8\u306f\u3053\u3053\u3067\u3082\u901a\u7528\u3057\u307e\u3059\u3002<\/p>\n
Linux\u306frelease_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u306e\u6240\u6709\u8005\u3092root\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u306e\u3067\u3001root(\u307e\u305f\u306fCAP_DAC_OVERRIDE<\/span>\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3067\u30d5\u30a1\u30a4\u30eb\u306e\u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u30c1\u30a7\u30c3\u30af\u3092\u56de\u907f\u3067\u304d\u308b\u30d7\u30ed\u30bb\u30b9)\u306e\u307f\u304c\u66f8\u304d\u8fbc\u307f\u3092\u884c\u3048\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u3053\u306e\u8106\u5f31\u6027\u3067\u306froot\u30d7\u30ed\u30bb\u30b9\u306b\u3088\u308b\u7279\u6a29\u306e\u6607\u683c\u306e\u307f<\/strong>\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
\u4e00\u898b\u3059\u308b\u3068\u3001root\u30e6\u30fc\u30b6\u30fc\u306b\u3057\u304b\u653b\u7565\u3067\u304d\u306a\u3044\u7279\u6a29\u6607\u683c\u306e\u8106\u5f31\u6027\u306f\u5947\u7570\u306b\u6620\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u4ee5\u524d\u3067\u3042\u308c\u3070\u3001\u3053\u308c\u306f\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u4e0a\u306e\u554f\u984c\u3068\u306f\u307f\u306a\u3055\u308c\u306a\u304b\u3063\u305f\u3067\u3057\u3087\u3046\u3002\u3067\u3059\u304c\u4eca\u65e5\u3001root\u3068\u3057\u3066\u306e\u5b9f\u884c\u306f\u5fc5\u305a\u3057\u3082\u30de\u30b7\u30f3\u306e\u5b8c\u5168\u306a\u5236\u5fa1\u306f\u610f\u5473\u3057\u307e\u305b\u3093\u3002root\u30e6\u30fc\u30b6\u30fc\u3068\u5168\u6a29\u9650\u3068\u306e\u9593\u306b\u306f\u3001\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3001\u540d\u524d\u7a7a\u9593\u3001\u30b3\u30f3\u30c6\u30ca\u306a\u3069\u3092\u542b\u3080\u30b0\u30ec\u30fc\u30be\u30fc\u30f3\u304c\u5b58\u5728\u3059\u308b\u306e\u3067\u3059\u3002\u300croot\u30d7\u30ed\u30bb\u30b9\u304c\u30de\u30b7\u30f3\u3092\u5b8c\u5168\u306b\u5236\u5fa1\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u300d\u3068\u3044\u3046\u30b7\u30ca\u30ea\u30aa\u3067\u306fCVE-2022-0492\u306f\u6df1\u523b\u306a\u8106\u5f31\u6027\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n
<\/a>\u591a\u5c64\u9632\u5fa1\u306e\u52dd\u5229 - \u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u306e\u524d\u63d0\u6761\u4ef6 <\/strong><\/h2>\n
\u3059\u3079\u3066\u306e\u30b3\u30f3\u30c6\u30ca\u304cCVE-2022-0492\u3092\u60aa\u7528\u3057\u3066\u30a8\u30b9\u30b1\u30fc\u30d7\u3067\u304d\u308b\u308f\u3051\u3067\u306f\u306a\u304f\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u306e\u3086\u308b\u3044\u30b3\u30f3\u30c6\u30ca\u306e\u307f\u304c\u5fc5\u8981\u306a\u30b9\u30c6\u30c3\u30d7\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002<\/p>\n
cgroupfs\u306f\u30b3\u30f3\u30c6\u30ca\u5185\u3067\u306f\u8aad\u307f\u53d6\u308a\u5c02\u7528\u3067\u30de\u30a6\u30f3\u30c8\u3055\u308c\u308b\u306e\u3067\u3001\u30b3\u30f3\u30c6\u30ca\u304c\u30db\u30b9\u30c8\u3059\u308brelease_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u66f8\u304d\u8fbc\u307f\u306f\u3067\u304d\u307e\u305b\u3093\u3002CVE-2022-0492\u3092\u60aa\u7528\u3057\u3088\u3046\u3068\u3059\u308b\u60aa\u610f\u306e\u3042\u308b\u30b3\u30f3\u30c6\u30ca\u306f\u3001\u66f8\u304d\u8fbc\u307f\u53ef\u80fd\u306a\u5225\u306ecgroupfs\u3092\u30de\u30a6\u30f3\u30c8\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
\"\u30b3\u30f3\u30c6\u30ca\u5185\u306ecgroupfs\u30de\u30a6\u30f3\u30c8\u306f\u8aad\u307f\u53d6\u308a\u5c02\u7528\"
\u56f33 \u30b3\u30f3\u30c6\u30ca\u5185\u306ecgroupfs\u30de\u30a6\u30f3\u30c8\u306f\u8aad\u307f\u53d6\u308a\u5c02\u7528(\"ro\")<\/figcaption><\/figure>\n
AppArmor\u3068SELinux\u306f\u3044\u305a\u308c\u3082\u30de\u30a6\u30f3\u30c8\u3092\u9632\u6b62\u3059\u308b\u306e\u3067\u3001\u3069\u3061\u3089\u304b1\u3064\u3092\u6709\u52b9\u306b\u3057\u3066\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306f\u4fdd\u8b77\u3055\u308c\u307e\u3059\u3002<\/strong>\u3069\u3061\u3089\u3082\u6709\u52b9\u3067\u306a\u3051\u308c\u3070\u3001\u30b3\u30f3\u30c6\u30ca\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u540d\u524d\u7a7a\u9593\u3092\u60aa\u7528\u3057\u3066 cgroupfs\u3092\u30de\u30a6\u30f3\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n
cgroupfs\u3092\u30de\u30a6\u30f3\u30c8\u3059\u308b\u306b\u306f\u3001\u73fe\u5728\u306ecgroup\u540d\u524d\u7a7a\u9593\u3092\u30db\u30b9\u30c8\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u306bCAP_SYS_ADMIN<\/span>\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u304c\u5fc5\u8981\u3067\u3059\u3002\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u306fCAP_SYS_ADMIM<\/span>\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u308b\u305f\u3081\u3001\u521d\u671f\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u306bcgroupfs\u3092\u30de\u30a6\u30f3\u30c8\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u305f\u3060\u3057\u30b3\u30f3\u30c6\u30ca\u306funshare()<\/span>\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001CAP_SYS_ADMIN<\/span>\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3092\u6240\u6709\u3057cgroupfs\u3092\u30de\u30a6\u30f3\u30c8\u53ef\u80fd\u306a\u65b0\u305f\u306a\u30e6\u30fc\u30b6\u30fc\u3068cgroup\u540d\u524d\u7a7a\u9593\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n
\"\u30b3\u30f3\u30c6\u30ca\u304cCAP_SYS_ADMIN\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3092\u6301\u3064\u65b0\u305f\u306a\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u3068\u3053\u308d\"
\u56f34 \u30b3\u30f3\u30c6\u30ca\u304cCAP_SYS_ADMIN\u30b1\u30a4\u30d1\u30d3\u30ea\u30c6\u30a3\u3092\u6301\u3064\u65b0\u305f\u306a\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u3092\u4f5c\u6210\u3057\u3066\u3044\u308b\u3068\u3053\u308d<\/figcaption><\/figure>\n
\u306a\u304a\u3001\u3059\u3079\u3066\u306e\u30b3\u30f3\u30c6\u30ca\u304c\u65b0\u3057\u3044\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u3092\u4f5c\u6210\u3067\u304d\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002 \u57fa\u76e4\u3068\u306a\u308b\u30db\u30b9\u30c8\u3067\u975e\u7279\u6a29\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u304c\u6709\u52b9\u306b\u306a\u3063\u3066\u3044\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/strong>\u6700\u8fd1\u306eUbuntu\u306e\u30ea\u30ea\u30fc\u30b9\u306a\u3069\u3067\u306f\u3053\u308c\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002Seccomp\u306funshare()<\/span>\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u306e\u3067Seccomp\u306a\u3057\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306e\u307f\u304c\u65b0\u3057\u3044\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u3092\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/strong>\u3053\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u306b\u793a\u3057\u305f\u30b3\u30f3\u30c6\u30ca\u306f\u3001Seccomp\u3001AppArmor\u3001SELinux\u3092\u4f7f\u7528\u305b\u305a\u306b\u5b9f\u884c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
\"\u3053\u306e\u30b3\u30f3\u30c6\u30ca\u306f\u65b0\u3057\u3044\u30e6\u30fc\u30b6\u30fc\u3068cgroup\u306e\u540d\u524d\u7a7a\u9593\u306bmemory\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3092\u30de\u30a6\u30f3\u30c8\u3057\u3066\u3044\u308b\"
\u56f35 \u3053\u306e\u30b3\u30f3\u30c6\u30ca\u306f\u65b0\u3057\u3044\u30e6\u30fc\u30b6\u30fc\u3068cgroup\u306e\u540d\u524d\u7a7a\u9593\u306bmemory\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3092\u30de\u30a6\u30f3\u30c8\u3057\u3066\u3044\u308b<\/figcaption><\/figure>\n
\u4e0a\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u3067\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u304c\u6b63\u5e38\u306bmemory\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3092\u30de\u30a6\u30f3\u30c8\u3057\u3066\u3044\u307e\u3059\u304c\u3001release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u304c\u30de\u30a6\u30f3\u30c8\u3055\u308c\u305f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306b\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u3053\u3068\u306b\u304a\u6c17\u3065\u304d\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
\u5148\u306b\u8ff0\u3079\u305f\u3088\u3046\u306b\u3001release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u306f\u3001root cgroup \u304b\u3089\u306e\u307f\u898b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002cgroupfs\u3092cgroup\u540d\u524d\u7a7a\u9593\u306b\u30de\u30a6\u30f3\u30c8\u3059\u308b\u969b\u306e\u96e3\u70b9\u306e1\u3064\u306f\u3001\u305d\u308c\u304croot cgroup\u3067\u306f\u306a\u304f\u81ea\u8eab\u306e\u6240\u5c5e\u3059\u308bcgroup\u3092\u30de\u30a6\u30f3\u30c8\u3059\u308b\u3068\u3044\u3046\u3053\u3068\u3067\u3059\u3002\u56f31\u307e\u3067\u30b9\u30af\u30ed\u30fc\u30eb\u3057\u3066\u623b\u308b\u3068\u3001\u30b3\u30f3\u30c6\u30ca\u306froot\u306ememory\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u306a\u304f\u3001\u5b50cgroup\u5185(\/docker\/<id><\/span>)\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002cgroup\u30de\u30a6\u30f3\u30c8\u5185\u304b\u3089release_agent \u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u3059\u308b\u306b\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u3092\u3044\u305a\u308c\u304b\u306e\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u5185\u306eroot cgroup \u3067\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/strong><\/p>\n
\u518d\u3073\u56f31\u306b\u623b\u308b\u3068\u3001Docker\u306f\u30b3\u30f3\u30c6\u30ca\u3092root\u306erdma\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3067\u5b9f\u884c\u3057\u305f\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002rdma\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306b\u5bfe\u3057\u3066\u540c\u3058\u30b3\u30de\u30f3\u30c9\u3092\u7e70\u308a\u8fd4\u305b\u3070release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3048\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\"\u30b3\u30f3\u30c6\u30ca\u304c\u65b0\u3057\u3044\u30e6\u30fc\u30b6\u30fc\u3068cgroup\u306e\u540d\u524d\u7a7a\u9593\u306broot\u306erdma\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3092\u30de\u30a6\u30f3\u30c8\u3059\u308b\"
\u56f36 \u30b3\u30f3\u30c6\u30ca\u304c\u65b0\u3057\u3044\u30e6\u30fc\u30b6\u30fc\u3068cgroup\u306e\u540d\u524d\u7a7a\u9593\u306broot\u306erdma\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u3092\u30de\u30a6\u30f3\u30c8\u3059\u308b<\/figcaption><\/figure>\n
\u3053\u306e\u554f\u984c\u3092\u60aa\u7528\u3059\u308b\u306b\u306f\u3001release_agent<\/span>\u30d5\u30a1\u30a4\u30eb\u306b\u60aa\u610f\u306e\u3042\u308b\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3092\u66f8\u304d\u8fbc\u3080\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u4e0a\u306e\u56f36\u304b\u3089\u308f\u304b\u308b\u3088\u3046\u306b\u3001release_agent\u30d5\u30a1\u30a4\u30eb\u306froot\u306e\u6240\u6709\u306a\u306e\u3067root\u306e\u30b3\u30f3\u30c6\u30ca\u30d7\u30ed\u30bb\u30b9\u306e\u307f\u304c\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3092\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/strong>\u56f37\u306f\u30b3\u30f3\u30c6\u30ca\u304c\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u305f\u3068\u304d\u306e\u69d8\u5b50\u3092\u3001\u56f38\u306froot\u3067\u306f\u306a\u3044\u30b3\u30f3\u30c6\u30ca\u304c\u8a2d\u5b9a\u306b\u5931\u6557\u3057\u305f\u3068\u304d\u306e\u69d8\u5b50\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\"\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u305froot\u30b3\u30f3\u30c6\u30ca\"
\u56f37 \u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u3092\u8a2d\u5b9a\u3057\u305froot\u30b3\u30f3\u30c6\u30ca<\/figcaption><\/figure>\n
\"\u975eroot\u30b3\u30f3\u30c6\u30ca\u306f\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u306e\u8a2d\u5b9a\u306b\u5931\u6557\"
\u56f38. \u975eroot\u30b3\u30f3\u30c6\u30ca\u306f\u30ea\u30ea\u30fc\u30b9\u30a8\u30fc\u30b8\u30a7\u30f3\u30c8\u306e\u8a2d\u5b9a\u306b\u5931\u6557<\/figcaption><\/figure>\n
\u30a8\u30b9\u30b1\u30fc\u30d7\u306e\u6700\u5f8c\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u3001\u8a2d\u5b9a\u3057\u305frelease_agent<\/span>\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001\u3053\u308c\u306f\u4f55\u306e\u6a29\u9650\u3082\u5fc5\u8981\u3068\u3057\u307e\u305b\u3093\u3002\u3053\u306e\u30b9\u30c6\u30c3\u30d7\u306f\u5e38\u306b\u5b9f\u884c\u53ef\u80fd\u3067\u3001\u305d\u306e\u74b0\u5883\u304cCVE-2022-0492\u306b\u5bfe\u3057\u3066\u8106\u5f31\u304b\u3069\u3046\u304b\u306f\u95a2\u4fc2\u306a\u3044\u306e\u3067\u5272\u611b\u3057\u307e\u3057\u305f\u3002\u4ee5\u4e0b\u306e\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8\u304b\u3089\u5b8c\u5168\u306a\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u306e\u69d8\u5b50\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n
\"CVE-2022-0492\u3092\u60aa\u7528\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u7d4c\u7531\u3067\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u3092\u884c\u3063\u305f\u3068\u3053\u308d\"
\u56f39 CVE-2022-0492\u3092\u60aa\u7528\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u7d4c\u7531\u3067\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u3092\u884c\u3063\u305f\u3068\u3053\u308d<\/figcaption><\/figure>\n
\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u592a\u5b57\u306e<\/strong>\u884c\u3092\u78ba\u8a8d\u3059\u308b\u3068CVE-2022-0492\u3092\u60aa\u7528\u3057\u3066\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u3092\u7d4c\u7531\u3067\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u3059\u308b\u305f\u3081\u306e\u8981\u4ef6\u304c\u66f8\u304b\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n
<\/a>\u5f71\u97ff\u306e\u6709\u7121\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f<\/strong><\/h2>\n
\u7d50\u8ad6\u304b\u3089\u8a00\u3046\u3068\u4ee5\u4e0b\u3092\u6e80\u305f\u3059\u72b6\u614b\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306f\u30a8\u30b9\u30b1\u30fc\u30d7\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
    \n
  1. root\u30e6\u30fc\u30b6\u30fc\u3068\u3057\u3066\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3002\u3042\u308b\u3044\u306f no_new_privs<\/a><\/span>\u30d5\u30e9\u30b0\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3002AND<\/li>\n
  2. AppArmor\u3001SELinux<\/a>\u306e\u3044\u305a\u308c\u3082\u6709\u52b9\u3067\u306f\u306a\u3044\u3002AND<\/li>\n
  3. Seccomp<\/a>\u3092\u6709\u52b9\u5316\u3057\u3066\u3044\u306a\u3044\u3002AND<\/li>\n
  4. \u975e\u7279\u6a29\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u304c\u6709\u52b9\u306a\u30db\u30b9\u30c8\u3067\u5b9f\u884c\u3057\u3066\u3044\u308b\u3002AND<\/li>\n
  5. root\u306ev1 cgroup\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b<\/li>\n<\/ol>\n
    Unit 42\u306e\u30ea\u30b5\u30fc\u30c1\u30e3\u30fc\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u74b0\u5883\u304cCVE-2022-0492\u306b\u5bfe\u3057\u3066\u8106\u5f31\u304b\u3069\u3046\u304b\u3092\u30c6\u30b9\u30c8\u3067\u304d\u308b\u30b9\u30af\u30ea\u30d7\u30c8<\/a>\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u3002\u79c1\u305f\u3061\u306eus-central1-docker.pkg.dev\/twistlock-secresearch\/public\/can-ctr-escape-cve-2022-0492<\/span> \u30a4\u30e1\u30fc\u30b8\u3092\u5b9f\u884c\u3059\u308b\u65b0\u3057\u3044\u30b3\u30f3\u30c6\u30ca\u3092\u30c7\u30d7\u30ed\u30a4\u3059\u308b\u3060\u3051\u3067\u624b\u5143\u74b0\u5883\u3092\u30c6\u30b9\u30c8\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30c6\u30b9\u30c8\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9f\u884c\u3057\u3001\u51fa\u529b\u3092\u8868\u793a\u3057\u305f\u5f8c\u7d42\u4e86\u3059\u308b\u3088\u3046\u306b\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3042\u308b\u3044\u306f\u3001\u3053\u306e\u30c4\u30fc\u30eb\u306e\u30ea\u30dd\u30b8\u30c8\u30ea\u306b\u542b\u307e\u308c\u3066\u3044\u308bDockerfile\u3092\u4f7f\u3044\u3001\u3054\u81ea\u8eab\u306e\u30a4\u30e1\u30fc\u30b8\u3092\u30d3\u30eb\u30c9\u3057\u3066\u5b9f\u884c\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n
    \u306a\u304a\u3001\u53ef\u80fd\u3067\u306f\u3042\u308a\u307e\u3059\u304c\u3001\u304a\u624b\u5143\u306e\u65e2\u5b58\u306e\u30b3\u30f3\u30c6\u30ca\u3067\u3053\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u306f\u304a\u52e7\u3081\u3057\u307e\u305b\u3093\u3002\u305d\u308c\u3089\u306b\u306f\u79c1\u305f\u3061\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u304c\u4f9d\u5b58\u3057\u3066\u3044\u308b\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3\u3084\u5fc5\u8981\u306a\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u3001\u7d50\u679c\u304c\u6b63\u3057\u304f\u306a\u304f\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n
    \"\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u4f7f\u3063\u3066\u3069\u306e\u30b3\u30f3\u30c6\u30ca\u69cb\u6210\u304cCVE-2022-0492\u3092\u60aa\u7528\u3057\u3066\u30a8\u30b9\u30b1\u30fc\u30d7\u3067\u304d\u308b\u304b\u3092\u30c6\u30b9\u30c8\u53ef\u80fd\"
    \u56f310. \u30b9\u30af\u30ea\u30d7\u30c8\u3092\u4f7f\u3063\u3066\u3069\u306e\u30b3\u30f3\u30c6\u30ca\u69cb\u6210\u304cCVE-2022-0492\u3092\u60aa\u7528\u3057\u3066\u30a8\u30b9\u30b1\u30fc\u30d7\u3067\u304d\u308b\u304b\u3092\u30c6\u30b9\u30c8\u53ef\u80fd<\/figcaption><\/figure>\n
    <\/a>\u56de\u907f\u30fb\u7de9\u548c\u7b56<\/strong><\/h2>\n
    CVE-2022-0492 \u306f\u3001\u6700\u65b0\u306e Linux \u30ea\u30ea\u30fc\u30b9\u3067\u4fee\u6b63\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u3001\u5404\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u306e\u6700\u65b0\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n
    \u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3067\u304d\u306a\u3044\u72b6\u6cc1\u4e0b\u3067\u60aa\u610f\u306e\u3042\u308b\u30b3\u30f3\u30c6\u30ca\u304b\u3089\u306e\u4fdd\u8b77\u3092\u53d7\u3051\u308b\u306b\u306f\u3001\u6b21\u306e\u3044\u305a\u308c\u304b\u306e\u7de9\u548c\u7b56\u3092\u6709\u52b9\u306b\u3057\u307e\u3059\u3002<\/p>\n
      \n
    1. AppArmor\u307e\u305f\u306fSELinux\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u8a73\u3057\u304f\u306f\u3053\u3061\u3089\u306eKubernetes\u30ac\u30a4\u30c9<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n
    2. Seccomp\u3092\u6709\u52b9\u306b\u3059\u308b\u3002\u8a73\u3057\u304f\u306f\u3053\u3061\u3089\u306eKubernetes\u30ac\u30a4\u30c9<\/a>\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ol>\n
      <\/a>Prisma Cloud\u306b\u3088\u308b\u4fdd\u8b77<\/strong><\/h2>\n
      Prisma Cloud\u306f\u8106\u5f31\u6027\u306e\u3042\u308b\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u30db\u30b9\u30c8\u3092\u691c\u51fa\u3057\u3001\u30a2\u30e9\u30fc\u30c8\u3092\u767a\u5831\u3057\u307e\u3059\u3002\u307e\u305f\u3001Seccomp\u3067\u4fdd\u8b77\u3055\u308c\u3066\u3044\u306a\u3044\u30b3\u30f3\u30c6\u30ca\u3084\u3001AppArmor\u306a\u3044\u3057SELinux\u306e\u3044\u305a\u308c\u3082\u6709\u52b9\u3067\u306a\u3044\u72b6\u614b\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306b\u5bfe\u3057\u3066\u3001\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u30a2\u30e9\u30fc\u30c8\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n
      \"CVE-2022-0492\u306e\u8106\u5f31\u6027\u304c\u3042\u308b\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u52d5\u4f5c\u3057\u3066\u3044\u308bLinux\u30db\u30b9\u30c8\u3067Prisma
      \u56f311. CVE-2022-0492\u306e\u8106\u5f31\u6027\u304c\u3042\u308b\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u52d5\u4f5c\u3057\u3066\u3044\u308bLinux\u30db\u30b9\u30c8\u3067Prisma Cloud\u304c\u30a2\u30e9\u30fc\u30c8\u3092\u767a\u5831<\/figcaption><\/figure>\n
      \"Prisma
      \u56f312. Prisma Cloud\u304cSeccomp\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306b\u5bfe\u3057\u3066\u91cd\u8981\u306a\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u30a2\u30e9\u30fc\u30c8\u3092\u751f\u6210<\/figcaption><\/figure>\n
      Compute\/Defend\/Compliance<\/span>\u4ee5\u4e0b\u3067\u3001\u305f\u3068\u3048\u3070\u7279\u5b9a\u306e\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u30eb\u30fc\u30eb\u306b\u5f93\u3063\u3066\u3044\u306a\u3044\u30b3\u30f3\u30c6\u30ca\u3084\u3001\u56f313\u306b\u793a\u3059\u3088\u3046\u306aSeccomp\u306a\u3057\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u3067\u3055\u3089\u306b\u74b0\u5883\u306e\u30cf\u30fc\u30c9\u30cb\u30f3\u30b0\u3092\u306f\u304b\u308c\u307e\u3059\u3002<\/p>\n
      \"\"<\/p>\n
      <\/a>\u7d50\u8ad6<\/strong><\/h2>\n
      CVE-2022-0492\u306f\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u306b\u60aa\u7528\u3055\u308c\u3046\u308bLinux\u306e\u3042\u3089\u305f\u306a\u8106\u5f31\u6027\u3067\u3059\u3002\u3055\u3044\u308f\u3044\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u5f93\u3063\u3066\u3044\u308b\u74b0\u5883\u306f\u3053\u306e\u8106\u5f31\u6027\u304b\u3089\u4fdd\u8b77\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u30b3\u30f3\u30c6\u30ca\u3084\u4e00\u822c\u516c\u958b\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u3092\u30db\u30b9\u30c8\u3057\u3066\u3044\u308b\u74b0\u5883\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u7ba1\u7406\u304c\u7518\u3044\u3068\u3001\u5f53\u7136\u306e\u3053\u3068\u306a\u304c\u3089\u3001\u30ea\u30b9\u30af\u306f\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002\u3044\u3064\u3082\u3069\u304a\u308a\u3001\u30db\u30b9\u30c8\u3092\u4fee\u6b63\u6e08\u307f\u306e\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3059\u308b\u3053\u3068\u304c\u6700\u5584\u306e\u5bfe\u7b56\u3067\u3059\u3002<\/p>\n
      \u3053\u306e\u8106\u5f31\u6027\u3092\u542b\u3081\u3001\u4eca\u5f8c\u306eLinux\u306e\u30bc\u30ed\u30c7\u30a4\u8106\u5f31\u6027\u304b\u3089\u306e\u4fdd\u8b77\u306b\u306f\u3001Seccomp\u3068AppArmor\u306a\u3044\u3057SELinux\u3092\u6709\u52b9\u306b\u3057\u3066\u30b3\u30f3\u30c6\u30ca\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u3092\u5f37\u304f\u304a\u52e7\u3081\u3057\u307e\u3059\u3002Linux\u30ab\u30fc\u30cd\u30eb\u306b\u5b58\u5728\u3059\u308b\u591a\u304f\u306e\u7279\u6a29\u6607\u683c\u306e\u8106\u5f31\u6027\u306f\u3001\u30b3\u30f3\u30c6\u30ca\u304c\u65b0\u305f\u306a\u30e6\u30fc\u30b6\u30fc\u540d\u524d\u7a7a\u9593\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u3092\u8a31\u53ef\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u8a00\u3044\u63db\u3048\u308c\u3070\u3001\u30b3\u30f3\u30c6\u30ca\u304cSeccomp\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u306e\u307f\u3001\u30b3\u30f3\u30c6\u30ca\u30a8\u30b9\u30b1\u30fc\u30d7\u306b\u60aa\u7528\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
      Prisma Cloud\u3092\u304a\u4f7f\u3044\u306e\u304a\u5ba2\u69d8\u306f\u3001Compute\/Monitor\/Compliance<\/span>\u3092\u78ba\u8a8d\u3057\u3001Seccomp\u306a\u3057\u3067\u52d5\u4f5c\u3057\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u304c\u306a\u3044\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002\u56f313\u306b\u793a\u3057\u305f\u3088\u3046\u306bSeccomp\u306a\u3057\u3067\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30c6\u30ca\u306f\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n
      2022-03-08 09:40 JST \u82f1\u8a9e\u7248\u66f4\u65b0\u65e5 2022-03-07 07:00 PST \u306e\u5185\u5bb9\u3092\u53cd\u6620\u00a0<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"
      \u6982\u8981 2022\u5e742\u67084\u65e5\u3001Linux\u306f\u30ab\u30fc\u30cd\u30eb\u306b\u304a\u3051\u308b\u65b0\u305f\u306a\u7279\u6a29\u6607\u683c\u8106\u5f31\u6027CVE-2022-0492\u3092\u516c\u8868\u3057\u307e\u3057\u305f\u3002CVE-2022-0492\u306f\u30b3\u30f3\u30c6\u30ca\u306e\u57fa\u672c\u69cb\u6210\u8981\u7d20\u3067\u3042\u308bLinux\u306e\u6a5f\u80fd\u3001\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u30b0\u30eb\u30fc\u30d7(cgro<\/p>\n","protected":false},"author":323,"featured_media":134248,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4469,4436,4428,4470],"tags":[4627,5752,4553],"product_categories":[4345,4458],"coauthors":[1484],"class_list":["post-122221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vulnerabilities","category-cloud-cybersecurity-research-ja","category-threat-research-ja","category-vulnerabilities-ja","tag-containers-ja","tag-cve-2022-0492","tag-linux-ja","product_categories-prisma-cloud","product_categories-prisma-cloud-ja"],"yoast_head":"\ncgroups\u306b\u5f71\u97ff\u3059\u308bLinux\u306e\u65b0\u305f\u306a\u8106\u5f31\u6027CVE-2022-0492 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