{"id":40591,"date":"2021-02-10T10:00:46","date_gmt":"2021-02-10T01:00:46","guid":{"rendered":"https:\/\/www.creationline.com\/?p=40591"},"modified":"2021-02-09T18:27:08","modified_gmt":"2021-02-09T09:27:08","slug":"cve-2021-3156%ef%bc%9asudo%e3%81%ae%e8%84%86%e5%bc%b1%e6%80%a7%e3%81%ab%e3%82%88%e3%82%8b%e7%89%b9%e6%a8%a9%e6%98%87%e6%a0%bc-aqua-%e3%82%b3%e3%83%b3%e3%83%86%e3%83%8a-%e3%82%bb%e3%82%ad%e3%83%a5","status":"publish","type":"post","link":"https:\/\/www.creationline.com\/tech-blog\/cloudnative\/aquasecurity\/40591","title":{"rendered":"CVE-2021-3156\uff1asudo\u306e\u8106\u5f31\u6027\u306b\u3088\u308b\u7279\u6a29\u6607\u683c #aqua #\u30b3\u30f3\u30c6\u30ca #\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3 #CVE20213156 #\u8106\u5f31\u6027 #sudo"},"content":{"rendered":"<p>\u672c\u30d6\u30ed\u30b0\u306f\u300cAqua Security\u300d\u793e\u306e\u6280\u8853\u30d6\u30ed\u30b0\u30672021\u5e742\u67081\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u300c<a href=\"https:\/\/blog.aquasec.com\/cve-2021-3156-sudo-vulnerability-allows-root-privileges\" rel=\"nofollow noopener noreferrer\" target=\"_blank\"> CVE-2021-3156 sudo Vulnerability Allows Root Privileges <\/a>\u300d\u306e\u65e5\u672c\u8a9e\u7ffb\u8a33\u3067\u3059\u3002<\/p>\n<p><center><img loading=\"lazy\" decoding=\"async\" src=\"\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2021\/02\/3684f3ae25dce876f71d2e9c707b770a.png\" alt=\"\" width=\"867\" height=\"418\" class=\"alignnone size-full wp-image-40593\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2021\/02\/3684f3ae25dce876f71d2e9c707b770a.png 867w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2021\/02\/3684f3ae25dce876f71d2e9c707b770a-360x174.png 360w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2021\/02\/3684f3ae25dce876f71d2e9c707b770a-768x370.png 768w\" sizes=\"auto, (max-width: 867px) 100vw, 867px\" \/><\/center><\/p>\n<h2>CVE-2021-3156\uff1asudo\u306e\u8106\u5f31\u6027\u306b\u3088\u308b\u7279\u6a29\u6607\u683c<\/h2>\n<hr \/>\n<p>UNIX \u304a\u3088\u3073 Linux OS \u306b\u65b0\u305f\u306a\u6df1\u523b\u306a\u8106\u5f31\u6027\u304c\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u30d6\u30ed\u30b0\u3067\u306f\u3001\u3053\u306e CVE \u304c\u3069\u306e\u3088\u3046\u306b\u60aa\u7528\u3055\u308c\u308b\u306e\u304b\u3001\u3069\u306e sudo \u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u5f71\u97ff\u3092\u53d7\u3051\u308b\u306e\u304b\u3001\u305d\u3057\u3066\u554f\u984c\u3092\u7de9\u548c\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n<h3>\u6280\u8853\u7684\u306a\u89e3\u8aac<\/h3>\n<p>\u901a\u5e38\u3001sudo \u306f\u4ed6\u306e\u30e6\u30fc\u30b6(\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f root \u30e6\u30fc\u30b6\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u307e\u3059)\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u6a29\u9650\u3067\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u30e6\u30fc\u30b6\u306f\u3001\u8a8d\u8a3c\u306e\u305f\u3081\u306b\u81ea\u5206\u306e\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8a8d\u8a3c\u5f8c\u3001\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u304c\u305d\u306e\u30e6\u30fc\u30b6\u306e\u30a2\u30af\u30bb\u30b9\u3092\u8a31\u53ef\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u305d\u306e\u30e6\u30fc\u30b6\u306f\u4ed6\u306e\u30e6\u30fc\u30b6\u306e\u6a29\u9650\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<br \/>\n\u30b7\u30a7\u30eb\u3067 sudo \u30b3\u30de\u30f3\u30c9\u3092\u30d5\u30e9\u30b0 -s \u307e\u305f\u306f -i (sudo -s \u307e\u305f\u306f sudo -i) \u3067\u5b9f\u884c\u3059\u308b\u5834\u5408\u3001\u6700\u521d\u306e\u6587\u5b57\u3092\u30de\u30fc\u30af\u3059\u308b\u305f\u3081\u306b 2 \u3064\u306e\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5 '\\' \u3092\u671f\u5f85\u3057\u307e\u3059\u3002<\/p>\n<pre><code>sudo -s '\\\\\\' `perl -e 'print \"A\" x 65536'`\n<\/code><\/pre>\n<p>\u3053\u306e\u30b3\u30de\u30f3\u30c9\u3092\u53d7\u4fe1\u3059\u308b\u3068\u3001sudoers policy \u30d7\u30e9\u30b0\u30a4\u30f3\u306f\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u3053\u306e\u30b3\u30de\u30f3\u30c9\u3092\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5 '\\' \u3060\u3051\u3067\u5b9f\u884c\u3059\u308b\u3068\u3001\u30a8\u30e9\u30fc\u3067\u7d42\u4e86\u3059\u308b\u306e\u3067\u5f71\u97ff\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>sudoedit \u306f\u3001\u30e6\u30fc\u30b6\u304c\u5b89\u5168\u306b\u30d5\u30a1\u30a4\u30eb\u3092\u7de8\u96c6\u3059\u308b\u305f\u3081\u306e\u7d44\u307f\u8fbc\u307f\u30b3\u30de\u30f3\u30c9\u3067\u3059\u3002\u3053\u306e\u65b0\u3057\u3044\u8106\u5f31\u6027\u3067\u306f\u3001Qualys \u306e\u7814\u7a76\u8005\u306f\u3001\u30d5\u30e9\u30b0 -s \u307e\u305f\u306f -i \u3092\u6307\u5b9a\u3057\u3066 sudoedit \u3092\u5b9f\u884c\u3057\u305f\u5834\u5408\u306b\u30b3\u30de\u30f3\u30c9\u306f\u30a8\u30e9\u30fc\u3068\u306a\u3089\u305a\u3001sudoers \u30dd\u30ea\u30b7\u30fc\u30d7\u30e9\u30b0\u30a4\u30f3\u306f\u30a8\u30b9\u30b1\u30fc\u30d7\u6587\u5b57\u3082\u524a\u9664\u3057\u306a\u3044\u305f\u3081\u3001\u30a8\u30b9\u30b1\u30fc\u30d7\u3055\u308c\u3066\u3044\u306a\u3044\u30d0\u30c3\u30af\u30b9\u30e9\u30c3\u30b7\u30e5\u6587\u5b57\u304c\u3042\u308b\u5834\u5408\u3001\u305d\u306e\u90e8\u5206\u3092\u8d85\u3048\u3066\u8aad\u307f\u8fbc\u3093\u3067\u3057\u307e\u3046\u3053\u3068\u304c\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<pre><code>sudoedit -s '\\' `perl -e 'print \"A\" x 65536'`\n<\/code><\/pre>\n<p>\u653b\u6483\u8005\u306f\u3053\u306e\u8106\u5f31\u6027\u3092\u60aa\u7528\u3057\u3066\u3001\u30e9\u30f3\u30c0\u30e0\u306a\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u7d50\u679c\u3068\u3057\u3066\u3001 sudoers \u30d5\u30a1\u30a4\u30eb\u306b\u8a2d\u5b9a\u3055\u308c\u305f\u5185\u5bb9\u3092\u7121\u8996\u3057\u3001\u8a8d\u8a3c\u306a\u3057\u306broot \u6a29\u9650\u3067\u30b3\u30de\u30f3\u30c9\u304c\u5b9f\u884c\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u3053\u306e\u8106\u5f31\u6027\u306f\u3001\u975e\u7279\u6a29\u30b3\u30f3\u30c6\u30ca\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u3082\u9069\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u6700\u3082\u53e4\u3044\u8106\u5f31\u6027\u306e\u3042\u308b sudo \u30d0\u30fc\u30b8\u30e7\u30f3\u306f2011\u5e74\u306e\u6700\u521d\u306b\u30b3\u30df\u30c3\u30c8\u3055\u308c\u305f\u3082\u306e\u3067\u3059\u30021.8.2\u304b\u30891.8.31p2\u307e\u3067\u306e\u3059\u3079\u3066\u306e\u30ec\u30ac\u30b7\u30fc\u30d0\u30fc\u30b8\u30e7\u30f3\u3068\u30011.9.0\u304b\u30891.9.5p1\u307e\u3067\u306e\u3059\u3079\u3066\u306e\u5b89\u5b9a\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u69cb\u6210\u306e\u5834\u5408\u306b\u5f71\u97ff\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u5f71\u97ff\u3092\u53d7\u3051\u3066\u3044\u308b\u304b\u306e\u78ba\u8a8d\u65b9\u6cd5<\/h3>\n<p><a href=\"https:\/\/www.sudo.ws\/alerts\/unescape_overflow.html\" rel=\"noopener noreferrer\" target=\"_blank\">sudo \u30d7\u30ed\u30b8\u30a7\u30af\u30c8<\/a>\u306f\u3001\u5229\u7528\u3057\u3066\u3044\u308b sudo \u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u8106\u5f31\u3067\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u30c6\u30b9\u30c8\u3067\u304d\u308b\u30b3\u30de\u30f3\u30c9\u3092\u516c\u958b\u3057\u307e\u3057\u305f\u3002<\/p>\n<pre><code>sudoedit -s '\\' `perl -e 'print \"A\" x 65536'`\n<\/code><\/pre>\n<p>\u30b3\u30de\u30f3\u30c9\u306e\u5b9f\u884c\u5f8c\u3001\u4f7f\u7528\u6cd5\u3084\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u305f\u5834\u5408\u3001sudo \u306b\u8106\u5f31\u6027\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306b Segmentation fault \u304c\u8868\u793a\u3055\u308c\u305f\u5834\u5408\u3001sudo \u306b\u8106\u5f31\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p><center><img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%201.jpg?width=1052&name=Image%201.jpg\" alt=\"\" \/><\/center><\/p>\n<h3>\u8106\u5f31\u6027\u306e\u5f71\u97ff\u3092\u7de9\u548c\u3057\u4fee\u5fa9<\/h3>\n<p>Aqua \u30b3\u30f3\u30bd\u30fc\u30eb\u3067\u306f\u3001sudoedit \u306e\u5b9f\u884c\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u305f\u3081\u306b\u3001\u30b3\u30f3\u30c6\u30ca\u30e9\u30f3\u30bf\u30a4\u30e0\u30dd\u30ea\u30b7\u30fc\u3092\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u300cPolicies\u300d\u306b\u9077\u79fb\u3057\u3001\u300cRuntime Policies\u300d\u3092\u9078\u629e\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%202%20and%205.jpg?width=186&name=Image%202%20and%205.jpg\" alt=\"\" \/><\/p>\n<li>\u300cAqua default runtime policy\u300d\u3092\u9078\u629e\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%203.jpg?width=600&name=Image%203.jpg\" alt=\"\" \/><\/p>\n<li>\u300cExcutables Blocked\u300d\u3092\u9078\u629e\u3057\u3001\u30d6\u30ed\u30c3\u30af\u3057\u305f\u3044\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb(\u4eca\u56de\u306f sudoedit)\u3092\u5165\u529b\u3057\u3001\u4fdd\u5b58\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%204.jpg?width=850&name=Image%204.jpg\" alt=\"\" \/>\n<\/ol>\n<p>\u3055\u3089\u306b\u3001Aqua \u306e\u30db\u30b9\u30c8\u30e9\u30f3\u30bf\u30a4\u30e0\u30dd\u30ea\u30b7\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3001VM \u4e0a\u3067\u3082sudoedit \u306e\u5b9f\u884c\u3092\u30d6\u30ed\u30c3\u30af\u3067\u304d\u307e\u3059\u3002<\/p>\n<ol>\n<li>\u300cPolicies\u300d\u306b\u9077\u79fb\u3057\u3001\u300cRuntime Policies\u300d\u3092\u9078\u629e\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%202%20and%205.jpg?width=186&name=Image%202%20and%205.jpg\" alt=\"\" \/><\/p>\n<li>\u300cAqua default host runtime policy\u300d\u3092\u9078\u629e\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%206.jpg?width=706&name=Image%206.jpg\" alt=\"\" \/><\/p>\n<li>\u300cFile Block\u300d\u3092\u9078\u629e\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%207.jpg?width=850&name=Image%207.jpg\" alt=\"\" \/><\/p>\n<li>\u30d6\u30ed\u30c3\u30af\u3057\u305f\u3044\u30d0\u30a4\u30ca\u30ea\u540d\u3092\u5165\u529b\u3057\u3066(\u3053\u3053\u3067\u306f sudoedit)\u3001\u4fdd\u5b58\u3057\u307e\u3059\u3002<br \/>\n<img decoding=\"async\" src=\"https:\/\/blog.aquasec.com\/hs-fs\/hubfs\/Image%208.jpg?width=706&name=Image%208.jpg\" alt=\"\" \/>\n<\/ol>\n<p>\u307e\u305f\u3001<a href=\"https:\/\/www.sudo.ws\/download.html\" rel=\"noopener noreferrer\" target=\"_blank\">sudo \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u304c\u4fee\u6b63\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u30ea\u30ea\u30fc\u30b9<\/a>\u3057\u3066\u3044\u308b\u4ed6\u306b\u3001OS \u30a4\u30e1\u30fc\u30b8\u3092\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3067\u304d\u308b\u5834\u5408\u306f\u3001\u4e3b\u8981\u306a OS \u3067\u3042\u308b <a href=\"https:\/\/www.debian.org\/security\/2021\/dsa-4839\" rel=\"noopener noreferrer\" target=\"_blank\">Debian<\/a>\u3001<a href=\"https:\/\/lists.fedoraproject.org\/archives\/list\/package-announce@lists.fedoraproject.org\/message\/LHXK6ICO5AYLGFK2TAX5MZKUXTUKWOJY\/\" rel=\"noopener noreferrer\" target=\"_blank\">Fedora<\/a>\u3001<a href=\"https:\/\/ubuntu.com\/security\/notices\/USN-4705-1\" rel=\"noopener noreferrer\" target=\"_blank\">Ubuntu<\/a>\u3001<a href=\"https:\/\/access.redhat.com\/errata\/RHSA-2021:0218\" rel=\"noopener noreferrer\" target=\"_blank\">RedHat<\/a> \u304c\u30d1\u30c3\u30c1\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\t\t<!--HubSpot Call-to-Action Code -->\n\t\t<span class=\"hs-cta-wrapper\" id=\"hs-cta-wrapper-3a13195e-48f8-474a-ac0e-d21ac0a01291\">\n\t\t<span class=\"hs-cta-node hs-cta-3a13195e-48f8-474a-ac0e-d21ac0a01291\" id=\"3a13195e-48f8-474a-ac0e-d21ac0a01291\">\n\t\t<!--[if lte IE 8]>\n\t\t<div id=\"hs-cta-ie-element\"><\/div>\n\t\t<![endif]-->\n\t\t<a href=\"https:\/\/cta-redirect.hubspot.com\/cta\/redirect\/6168413\/3a13195e-48f8-474a-ac0e-d21ac0a01291\" >\n\t\t<img decoding=\"async\" class=\"hs-cta-img\" id=\"hs-cta-img-3a13195e-48f8-474a-ac0e-d21ac0a01291\" style=\"border-width:0px;\" src=\"https:\/\/no-cache.hubspot.com\/cta\/default\/6168413\/3a13195e-48f8-474a-ac0e-d21ac0a01291.png\"  alt=\"New call-to-action\"\/>\n\t\t<\/a>\n\t\t<\/span>\n\t\t<script charset=\"utf-8\" src=\"\/\/js.hubspot.com\/cta\/current.js\"><\/script>\n\t\t<script>\n\t\thbspt.cta.load(6168413, '3a13195e-48f8-474a-ac0e-d21ac0a01291', {});\n\t\t<\/script>\n\t\t<\/span>\n\t\t<!-- end HubSpot Call-to-Action Code -->\n\t\t\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u30d6\u30ed\u30b0\u306f\u300cAqua Security\u300d\u793e\u306e\u6280\u8853\u30d6\u30ed\u30b0\u30672021\u5e742\u67081\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u300c CVE-2021-3156 sudo Vulnerability Allows Root Privileges \u300d\u306e\u65e5\u672c\u8a9e\u7ffb\u8a33\u3067\u3059 [&#8230;]<\/p>\n","protected":false},"author":56,"featured_media":40593,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[176],"tags":[174,152,457,458,286,358,376],"class_list":["post-40591","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aquasecurity","tag-aqua","tag-aquasecurity","tag-cve20213156","tag-sudo","tag-286","tag-358","tag-376"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>CVE-2021-3156\uff1asudo\u306e\u8106\u5f31\u6027\u306b\u3088\u308b\u7279\u6a29\u6607\u683c #aqua #\u30b3\u30f3\u30c6\u30ca #\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3 #CVE20213156 #\u8106\u5f31\u6027 #sudo - Tech 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