{"id":1026,"date":"2026-05-20T17:27:10","date_gmt":"2026-05-20T08:27:10","guid":{"rendered":"https:\/\/www.hpc.co.jp\/support\/?page_id=1026"},"modified":"2026-05-20T17:27:10","modified_gmt":"2026-05-20T08:27:10","slug":"cve-2026-46333-ssh-keysign-pwn","status":"publish","type":"page","link":"https:\/\/www.hpc.co.jp\/support\/cve-2026-46333-ssh-keysign-pwn\/","title":{"rendered":"Linux\u30ab\u30fc\u30cd\u30eb\u8106\u5f31\u6027\uff08CVE-2026-46333: ssh-keysign-pwn\uff09\u306e\u5bfe\u51e6\u65b9\u6cd5"},"content":{"rendered":"<div id=\"page_head\" class=\"security_rick\">\n<div class=\"inviewfadeIn animated\">\n<div class=\"top_title_en\">Security Risk<\/div>\n<h1 class=\"top_title_jp\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u5bfe\u7b56 \u7279\u8a2d\u30da\u30fc\u30b8<\/h1>\n<\/div>\n<\/div>\n<div id=\"page_container\">\n<div class=\"pnkz\"><!-- Breadcrumb NavXT 6.2.1 --><br \/>\n<a href=\"https:\/\/www.hpc.co.jp\">\u30db\u30fc\u30e0<\/a> &gt; <a href=\"https:\/\/www.hpc.co.jp\/support\">\u30b5\u30dd\u30fc\u30c8<\/a> &gt; <a href=\"https:\/\/www.hpc.co.jp\/support\/faq\/\">\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u5bfe\u7b56\u7279\u8a2d\u30da\u30fc\u30b8<\/a> &gt; Linux\u30ab\u30fc\u30cd\u30eb\u8106\u5f31\u6027\uff08CVE-2026-46333: ssh-keysign-pwn\uff09\u306e\u5bfe\u51e6\u65b9\u6cd5<\/div>\n<section class=\"container\">\n<div class=\"block\">\n<div class=\"top_content\">\n<h2 class=\"title_full\">Linux\u30ab\u30fc\u30cd\u30eb\u8106\u5f31\u6027\uff08CVE-2026-46333: ssh-keysign-pwn\uff09\u306e\u5bfe\u51e6\u65b9\u6cd5<\/h2>\n<\/div>\n<div class=\"innerWrap\">\n<div class=\"simple_area\">\n<p>Linux\u30ab\u30fc\u30cd\u30eb\u306eptrace\u30b5\u30d6\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3044\u3066\u3001\u30ed\u30fc\u30ab\u30eb\u7279\u6a29\u6607\u683c\u306e\u8106\u5f31\u6027\uff08ssh-keysign-pwn\u3001CVE-2026-46333\uff09\u304c\u767a\u898b\u3055\u308c\u307e\u3057\u305f\u3002\u672c\u8106\u5f31\u6027\u306f\u3001\u975e\u7279\u6a29\u306e\u30ed\u30fc\u30ab\u30eb\u30e6\u30fc\u30b6\u30fc\u304croot\u6a29\u9650\u3067\u30aa\u30fc\u30d7\u30f3\u3055\u308c\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\uff08SSH\u30db\u30b9\u30c8\u9375\u3084\/etc\/shadow\u7b49\uff09\u3092\u8aad\u307f\u53d6\u308c\u308b\u6975\u3081\u3066\u6df1\u523b\u306a\u554f\u984c\u3067\u3059\u30022026\u5e745\u670815\u65e5\u306b\u516c\u958b\u3055\u308c\u305f\u672c\u8106\u5f31\u6027\u306b\u3064\u3044\u3066\u3001\u5f0a\u793e\u30b5\u30fc\u30d0\u88fd\u54c1\u306e\u5bfe\u5fdc\u72b6\u6cc1\u3068\u5bfe\u51e6\u65b9\u6cd5\u3092\u3054\u6848\u5185\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<p>\u8a73\u7d30\u306b\u3064\u3044\u3066\u306f\u4ee5\u4e0bURL\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044\u3002<\/p>\n<ul>\n<li><a href=\"https:\/\/almalinux.org\/ja\/blog\/2026-05-15-ssh-keysign-pwn-cve-2026-46333\/\">https:\/\/almalinux.org\/ja\/blog\/2026-05-15-ssh-keysign-pwn-cve-2026-46333\/<\/a><\/li>\n<li><a href=\"https:\/\/access.redhat.com\/security\/cve\/cve-2026-46333\">https:\/\/access.redhat.com\/security\/cve\/cve-2026-46333<\/a><\/li>\n<li><a href=\"https:\/\/access.redhat.com\/security\/vulnerabilities\/RHSB-2026-004\">https:\/\/access.redhat.com\/security\/vulnerabilities\/RHSB-2026-004<\/a><\/li>\n<li><a href=\"https:\/\/ubuntu.com\/security\/CVE-2026-46333\">https:\/\/ubuntu.com\/security\/CVE-2026-46333<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/0xdeadbeefnetwork\/ssh-keysign-pwn\">https:\/\/github.com\/0xdeadbeefnetwork\/ssh-keysign-pwn<\/a><\/li>\n<\/ul>\n<h2>\u8106\u5f31\u6027\u306e\u6982\u8981<\/h2>\n<p>Linux\u30ab\u30fc\u30cd\u30eb\u306e<code class=\"previewInlineCode_f755fc7f\">__ptrace_may_access()<\/code>\u306b\u304a\u3044\u3066\u3001\u30bf\u30fc\u30b2\u30c3\u30c8\u30d7\u30ed\u30bb\u30b9\u306e<code class=\"previewInlineCode_f755fc7f\">mm<\/code>\uff08\u30e1\u30e2\u30ea\u7ba1\u7406\u69cb\u9020\u4f53\uff09\u304c<code class=\"previewInlineCode_f755fc7f\">NULL<\/code>\u306e\u5834\u5408\u306bdumpable\u30c1\u30a7\u30c3\u30af\u304c\u30b9\u30ad\u30c3\u30d7\u3055\u308c\u308b\u8a2d\u8a08\u4e0d\u5099\u304c\u5b58\u5728\u3057\u307e\u3059\u3002\u30d7\u30ed\u30bb\u30b9\u7d42\u4e86\u6642\u3001\u30ab\u30fc\u30cd\u30eb\u306f<code class=\"previewInlineCode_f755fc7f\">exit_mm()<\/code>\u3092<code class=\"previewInlineCode_f755fc7f\">exit_files()<\/code>\u3088\u308a\u5148\u306b\u5b9f\u884c\u3059\u308b\u305f\u3081\u3001\u7279\u6a29\u30d7\u30ed\u30bb\u30b9\u304c\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u958b\u3044\u305f\u307e\u307e<code class=\"previewInlineCode_f755fc7f\">mm<\/code>\u3092\u89e3\u653e\u3059\u308b\u6642\u9593\u7a93\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u306e\u6642\u9593\u7a93\u306b\u304a\u3044\u3066\u3001\u540c\u4e00UID\u306e\u975e\u7279\u6a29\u30d7\u30ed\u30bb\u30b9\u304c<code class=\"previewInlineCode_f755fc7f\">pidfd_getfd(2)<\/code>\u30b7\u30b9\u30c6\u30e0\u30b3\u30fc\u30eb\u3092\u547c\u3073\u51fa\u3059\u3053\u3068\u3067\u3001\u7279\u6a29\u30d7\u30ed\u30bb\u30b9\u304c\u958b\u3044\u3066\u3044\u308b\u30d5\u30a1\u30a4\u30eb\u30c7\u30a3\u30b9\u30af\u30ea\u30d7\u30bf\u3092\u53d6\u5f97\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u958b\u3055\u308c\u3066\u3044\u308bPoC\uff08Proof of Concept\uff09\u3067\u306f\u3001<code class=\"previewInlineCode_f755fc7f\">ssh-keysign<\/code>\u30d7\u30ed\u30bb\u30b9\u304b\u3089<code class=\"previewInlineCode_f755fc7f\">\/etc\/ssh\/ssh_host_rsa_key<\/code>\u3092\u3001<code class=\"previewInlineCode_f755fc7f\">chage<\/code>\u30d7\u30ed\u30bb\u30b9\u304b\u3089<code class=\"previewInlineCode_f755fc7f\">\/etc\/shadow<\/code>\u3092\u8aad\u307f\u53d6\u308b\u30a8\u30af\u30b9\u30d7\u30ed\u30a4\u30c8\u304c\u5b9f\u8a3c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<ul data-line=\"18\">\n<li><strong class=\"previewStrong_f755fc7f\">\u8106\u5f31\u6027\u540d\u79f0<\/strong>: ssh-keysign-pwn<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">CVE\u756a\u53f7<\/strong>: CVE-2026-46333<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">\u6df1\u523b\u5ea6<\/strong>: High\uff08Ubuntu\u512a\u5148\u5ea6\uff09\/ Critical\uff08\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u5c02\u9580\u30e1\u30c7\u30a3\u30a2\u8a55\u4fa1\uff09<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">\u653b\u6483\u6761\u4ef6<\/strong>: \u30ed\u30fc\u30ab\u30eb\u30e6\u30fc\u30b6\u30fc\u30a2\u30af\u30bb\u30b9\u304c\u5fc5\u8981\uff08\u30ea\u30e2\u30fc\u30c8\u653b\u6483\u4e0d\u53ef\uff09<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">\u5f71\u97ff<\/strong>: \u30ed\u30fc\u30ab\u30eb\u7279\u6a29\u6607\u683c\uff08root\u6a29\u9650\u3067\u958b\u304b\u308c\u305f\u6a5f\u5bc6\u30d5\u30a1\u30a4\u30eb\u306e\u8aad\u307f\u53d6\u308a\uff09<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">\u653b\u6483\u306e\u7279\u5fb4<\/strong>: \u6c7a\u5b9a\u8ad6\u7684\u8ad6\u7406\u30d0\u30b0\u3067\u3042\u308a\u3001\u30ec\u30fc\u30b9\u6761\u4ef6\u4e0d\u8981\u3001\u6210\u529f\u78ba\u7387\u304c\u9ad8\u3044<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">\u5f71\u97ff\u671f\u9593<\/strong>: 2020\u5e7410\u6708\u4ee5\u964d\u3067\u4fee\u6b63\u3055\u308c\u3066\u3044\u306a\u3044\u30ab\u30fc\u30cd\u30eb<\/li>\n<li><strong class=\"previewStrong_f755fc7f\">\u4fee\u6b63\u30b3\u30df\u30c3\u30c8<\/strong>:\u00a0<a href=\"https:\/\/github.com\/torvalds\/linux\/commit\/31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a\" target=\"_blank\" rel=\"noopener noreferrer\">31e62c2ebbfd<\/a>\uff082026\u5e745\u670814\u65e5\u306bLinus Torvalds\u304c\u30de\u30fc\u30b8\uff09<\/li>\n<\/ul>\n<p>\u306a\u304a\u3001\u672c\u8106\u5f31\u6027\u306fSSH\u306e\u30d0\u30b0\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u300cssh-keysign-pwn\u300d\u3068\u3044\u3046\u540d\u79f0\u306f\u3001PoC\u306e\u653b\u6483\u5bfe\u8c61\u304cssh-keysign\u30d7\u30ed\u30bb\u30b9\u3067\u3042\u308b\u3053\u3068\u306b\u7531\u6765\u3057\u307e\u3059\u3002\u6839\u672c\u539f\u56e0\u306fLinux\u30ab\u30fc\u30cd\u30eb\u306eptrace\u30a2\u30af\u30bb\u30b9\u5236\u5fa1\u306e\u4e0d\u5099\u3067\u3059\u3002<\/p>\n<h3 id=\"\" data-line=\"37\">\u5bfe\u8c61\u3068\u306a\u308b\u30ab\u30fc\u30cd\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3<\/h3>\n<p>2020\u5e7410\u6708\u4ee5\u964d\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u305f\u30ab\u30fc\u30cd\u30eb\u3067\u3001\u672c\u8106\u5f31\u6027\u306e\u4fee\u6b63\u30b3\u30df\u30c3\u30c8\u304c\u542b\u307e\u308c\u3066\u3044\u306a\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u5bfe\u8c61\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h2>\u5f0a\u793e\u30b5\u30fc\u30d0\u88fd\u54c1\u306e\u5bfe\u5fdc\u72b6\u6cc1\uff082026\u5e745\u670819\u65e5\u73fe\u5728\uff09<\/h2>\n<h3>Ubuntu LTS\uff0820.04 \/ 22.04 \/ 24.04\uff09<\/h3>\n<table style=\"border-collapse: collapse; width: 100%; height: 96px;\" border=\"1\">\n<tbody>\n<tr style=\"height: 24px;\">\n<th style=\"width: 20%; height: 24px;\">\u30d0\u30fc\u30b8\u30e7\u30f3<\/th>\n<th style=\"width: 20%; height: 24px;\">\u5bfe\u8c61\u30ab\u30fc\u30cd\u30eb<\/th>\n<th style=\"width: 20%; height: 24px;\">\u30d1\u30c3\u30c1\u6e08\u307f\u30ab\u30fc\u30cd\u30eb<\/th>\n<th style=\"width: 20%; height: 24px;\">\u66ab\u5b9a\u5bfe\u51e6<\/th>\n<th style=\"width: 20%; height: 24px;\">\u30d1\u30c3\u30c1\u63d0\u4f9b\u72b6\u6cc1<\/th>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\">24.04 LTS<\/td>\n<td style=\"width: 20%; height: 24px;\">6.x\u7cfb<\/td>\n<td style=\"width: 20%; height: 24px;\"><strong>\u672a\u30ea\u30ea\u30fc\u30b9<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\"><strong class=\"previewStrong_f755fc7f\">\u3042\u308a<\/strong>\uff08sysctl\u8a2d\u5b9a\uff09<\/td>\n<td style=\"width: 20%; height: 24px;\">Vulnerable\uff08\u30d1\u30c3\u30c1\u672a\u30ea\u30ea\u30fc\u30b9\uff09<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\">22.04 LTS<\/td>\n<td style=\"width: 20%; height: 24px;\">5.15.x\u7cfb<\/td>\n<td style=\"width: 20%; height: 24px;\"><strong>\u672a\u30ea\u30ea\u30fc\u30b9<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\"><strong class=\"previewStrong_f755fc7f\">\u3042\u308a<\/strong>\uff08sysctl\u8a2d\u5b9a\uff09<\/td>\n<td style=\"width: 20%; height: 24px;\">Vulnerable\uff08\u30d1\u30c3\u30c1\u672a\u30ea\u30ea\u30fc\u30b9\uff09<\/td>\n<\/tr>\n<tr style=\"height: 24px;\">\n<td style=\"width: 20%; height: 24px;\">20.04 LTS<\/td>\n<td style=\"width: 20%; height: 24px;\">5.4.x\u7cfb<\/td>\n<td style=\"width: 20%; height: 24px;\"><strong>\u672a\u30ea\u30ea\u30fc\u30b9<\/strong><\/td>\n<td style=\"width: 20%; height: 24px;\"><strong class=\"previewStrong_f755fc7f\">\u3042\u308a<\/strong>\uff08sysctl\u8a2d\u5b9a\uff09<\/td>\n<td style=\"width: 20%; height: 24px;\">Needs evaluation\uff08\u8a55\u4fa1\u4e2d\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Ubuntu\u306e\u5168\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u304a\u3044\u3066\u30012026\u5e745\u670818\u65e5\u6642\u70b9\u3067\u30d1\u30c3\u30c1\u6e08\u307f\u30ab\u30fc\u30cd\u30eb\u306f\u672a\u30ea\u30ea\u30fc\u30b9\u3067\u3059\u3002\u66ab\u5b9a\u5bfe\u51e6\u306e\u9069\u7528\u3092\u5f37\u304f\u63a8\u5968\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<p>&nbsp;<\/p>\n<h3>Red Hat Enterprise Linux 8 \/ 9<\/h3>\n<table style=\"border-collapse: collapse; width: 99.8647%; height: 74px;\" border=\"1\">\n<tbody>\n<tr style=\"height: 24px;\">\n<th style=\"width: 14.885%; height: 24px;\">\u30d0\u30fc\u30b8\u30e7\u30f3<\/th>\n<th style=\"width: 39.5129%; height: 24px;\">\u30d1\u30c3\u30c1\u6e08\u307f\u30ab\u30fc\u30cd\u30eb<\/th>\n<th style=\"width: 45.4668%; height: 24px;\">\u30d1\u30c3\u30c1\u63d0\u4f9b\u72b6\u6cc1<\/th>\n<\/tr>\n<tr style=\"height: 25px;\">\n<td style=\"width: 14.885%; height: 25px;\">Red Hat Enterprise Linux 9<\/td>\n<td style=\"width: 39.5129%; height: 25px;\">\u672a\u30ea\u30ea\u30fc\u30b9<\/td>\n<td style=\"width: 45.4668%; height: 25px;\">\u00a0Vulnerable\uff08\u30d1\u30c3\u30c1\u672a\u30ea\u30ea\u30fc\u30b9\uff09<\/td>\n<\/tr>\n<tr style=\"height: 25px;\">\n<td style=\"width: 14.885%; height: 25px;\">Red Hat Enterprise Linux 8<\/td>\n<td style=\"width: 39.5129%; height: 25px;\">\u672a\u30ea\u30ea\u30fc\u30b9<\/td>\n<td style=\"width: 45.4668%; height: 25px;\">\u00a0Vulnerable\uff08\u30d1\u30c3\u30c1\u672a\u30ea\u30ea\u30fc\u30b9\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p data-line=\"54\">\u00a0<\/p>\n<h3 id=\"almalinux-8-9\" data-line=\"54\">AlmaLinux 8 \/ 9<\/h3>\n<table style=\"border-collapse: collapse; width: 99.8647%;\" border=\"1\">\n<tbody>\n<tr>\n<th style=\"width: 14.885%;\">\u30d0\u30fc\u30b8\u30e7\u30f3<\/th>\n<th style=\"width: 39.5129%;\">\u30d1\u30c3\u30c1\u6e08\u307f\u30ab\u30fc\u30cd\u30eb<\/th>\n<th style=\"width: 45.4668%;\">\u30d1\u30c3\u30c1\u63d0\u4f9b\u72b6\u6cc1<\/th>\n<\/tr>\n<tr>\n<td style=\"width: 14.885%;\">AlmaLinux 9<\/td>\n<td style=\"width: 39.5129%;\"><code class=\"previewInlineCode_f755fc7f\">kernel-5.14.0-611.54.6.el9_7<\/code><\/td>\n<td style=\"width: 45.4668%;\">\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30bf\u30fc\u304b\u3089\u30ea\u30ea\u30fc\u30b9\u6e08\u307f<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 14.885%;\">AlmaLinux 8<\/td>\n<td style=\"width: 39.5129%;\"><code class=\"previewInlineCode_f755fc7f\">kernel-4.18.0-553.124.4.el8_10<\/code><\/td>\n<td style=\"width: 45.4668%;\">\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30bf\u30fc\u304b\u3089\u30ea\u30ea\u30fc\u30b9\u6e08\u307f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>AlmaLinux\u3067\u306f\u30d1\u30c3\u30c1\u6e08\u307f\u30ab\u30fc\u30cd\u30eb\u304c\u672c\u756a\u30ea\u30dd\u30b8\u30c8\u30ea\u306b\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u30ab\u30fc\u30cd\u30eb\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u306b\u3088\u308a\u5f0a\u793e\u51fa\u8377\u6642\u306b\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3084\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u52d5\u4f5c\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3059\u53ef\u80fd\u6027\u304c\u3054\u3056\u3044\u307e\u3059\u3002\u5f0a\u793e\u306b\u3066\u52d5\u4f5c\u691c\u8a3c\u3092\u5b9f\u65bd\u3057\u3001\u6b63\u5e38\u306b\u52d5\u4f5c\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u305f\u4e0a\u3067\u3001\u30d1\u30c3\u30c1\u9069\u7528\u65b9\u6cd5\u3092\u672c\u30da\u30fc\u30b8\u306b\u3066\u3054\u6848\u5185\u3044\u305f\u3057\u307e\u3059\u3002\u691c\u8a3c\u5b8c\u4e86\u307e\u3067\u306f\u3001\u66ab\u5b9a\u5bfe\u51e6\u306e\u9069\u7528\u3092\u63a8\u5968\u3044\u305f\u3057\u307e\u3059\u3002<\/p>\n<h2>\u5bfe\u51e6\u65b9\u6cd5<\/h2>\n<h3 id=\"ubuntu-rhel-almalinux\" data-line=\"65\">\u3059\u3079\u3066\u306e\u5bfe\u8c61\u74b0\u5883\uff08Ubuntu \/ RHEL \/ AlmaLinux\uff09\u2014 \u66ab\u5b9a\u5bfe\u51e6<\/h3>\n<p data-line=\"67\">\u66ab\u5b9a\u5bfe\u51e6\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u624b\u9806\u3067\u8106\u5f31\u6027\u306e\u60aa\u7528\u3092\u9632\u6b62\u3067\u304d\u307e\u3059\u3002<code class=\"previewInlineCode_f755fc7f\">kernel.yama.ptrace_scope<\/code>\u30d1\u30e9\u30e1\u30fc\u30bf\u3092<code class=\"previewInlineCode_f755fc7f\">2<\/code>\uff08\u7ba1\u7406\u8005\u306e\u307f\u30a2\u30bf\u30c3\u30c1\u8a31\u53ef\uff09\u307e\u305f\u306f<code class=\"previewInlineCode_f755fc7f\">3<\/code>\uff08\u30a2\u30bf\u30c3\u30c1\u7981\u6b62\uff09\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u65e2\u77e5\u306ePoC\u306e\u5b9f\u884c\u3092\u30d6\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n<h4 id=\"1sysctl\" data-line=\"69\">\uff081\uff09sysctl\u306b\u3088\u308b\u66ab\u5b9a\u5bfe\u51e6\u306e\u9069\u7528<\/h4>\n<p data-line=\"71\">\u3000root\u3067\u8a08\u7b97\u6a5f\u306b\u30ed\u30b0\u30a4\u30f3\u3057\u3001\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"previewPre_f755fc7f\" data-line=\"73\"><code># sysctl -w kernel.yama.ptrace_scope=3\r\nkernel.yama.ptrace_scope = 3\r\n<\/code><\/pre>\n<p data-line=\"78\">\u3000\u307e\u305f\u306f\u3001\u7ba1\u7406\u8005\u306e\u307fptrace\u3092\u8a31\u53ef\u3059\u308b\u8a2d\u5b9a\uff08<code class=\"previewInlineCode_f755fc7f\">2<\/code>\uff09\u3092\u9078\u3076\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"previewPre_f755fc7f\" data-line=\"80\"><code># sysctl -w kernel.yama.ptrace_scope=2\r\nkernel.yama.ptrace_scope = 2\r\n<\/code><\/pre>\n<h4 id=\"2\" data-line=\"85\">\uff082\uff09\u518d\u8d77\u52d5\u5f8c\u3082\u8a2d\u5b9a\u3092\u6c38\u7d9a\u5316\u3059\u308b<\/h4>\n<p data-line=\"87\">\u3000\u518d\u8d77\u52d5\u5f8c\u3082\u8a2d\u5b9a\u304c\u6709\u52b9\u306b\u306a\u308b\u3088\u3046\u3001<code class=\"previewInlineCode_f755fc7f\">\/etc\/sysctl.d\/<\/code>\u306b\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"previewPre_f755fc7f\" data-line=\"89\"><code># cat &gt; \/etc\/sysctl.d\/99-ssh-keysign-pwn.conf &lt;&lt; 'EOF'\r\nkernel.yama.ptrace_scope = 3\r\nEOF\r\n<\/code><\/pre>\n<h4 id=\"3\" data-line=\"95\">\uff083\uff09\u8a2d\u5b9a\u306e\u78ba\u8a8d<\/h4>\n<p data-line=\"97\">\u3000\u4ee5\u4e0b\u306e\u30b3\u30de\u30f3\u30c9\u3092\u5b9f\u884c\u3057\u3001\u8a2d\u5b9a\u304c\u6b63\u3057\u304f\u53cd\u6620\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"previewPre_f755fc7f\" data-line=\"99\"><code># sysctl kernel.yama.ptrace_scope\r\nkernel.yama.ptrace_scope = 3\r\n<\/code><\/pre>\n<h4 id=\"4\" data-line=\"104\">\uff084\uff09\u8a2d\u5b9a\u306e\u53cd\u6620\u78ba\u8a8d\uff08\u518d\u8d77\u52d5\u5f8c\uff09<\/h4>\n<p data-line=\"106\">\u3000\u518d\u8d77\u52d5\u5f8c\u306b\u3082\u8a2d\u5b9a\u304c\u6c38\u7d9a\u5316\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"previewPre_f755fc7f\" data-line=\"108\"><code># sysctl kernel.yama.ptrace_scope\r\nkernel.yama.ptrace_scope = 3\r\n<\/code><\/pre>\n<p data-line=\"113\">\u00a0<\/p>\n<h4 id=\"\" data-line=\"113\">\u66ab\u5b9a\u5bfe\u51e6\u306e\u5236\u9650\u4e8b\u9805<\/h4>\n<p data-line=\"115\">\u3000<code class=\"previewInlineCode_f755fc7f\">kernel.yama.ptrace_scope<\/code>\u3092<code class=\"previewInlineCode_f755fc7f\">2<\/code>\u307e\u305f\u306f<code class=\"previewInlineCode_f755fc7f\">3<\/code>\u306b\u8a2d\u5b9a\u3057\u305f\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u6a5f\u80fd\u306b\u5f71\u97ff\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<table style=\"border-collapse: collapse; width: 99.8647%;\" border=\"1\">\n<tbody>\n<tr>\n<th style=\"width: 26.387%;\">ptrace_scope\u306e\u5024<\/th>\n<th style=\"width: 73.4777%;\">\u5f71\u97ff<\/th>\n<\/tr>\n<tr>\n<td style=\"width: 26.387%;\">2\uff08\u7ba1\u7406\u8005\u306e\u307f\u30a2\u30bf\u30c3\u30c1\u8a31\u53ef\uff09<\/td>\n<td style=\"width: 73.4777%;\">root\u4ee5\u5916\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u3088\u308b<code class=\"previewInlineCode_f755fc7f\">gdb<\/code>\u3001<code class=\"previewInlineCode_f755fc7f\">strace -p<\/code>\u7b49\u306e\u30c7\u30d0\u30c3\u30b0\u30c4\u30fc\u30eb\u306e\u4f7f\u7528\u304c\u5236\u9650\u3055\u308c\u308b<\/td>\n<\/tr>\n<tr>\n<td style=\"width: 26.387%;\">3\uff08\u30a2\u30bf\u30c3\u30c1\u7981\u6b62\uff09<\/td>\n<td style=\"width: 73.4777%;\">\u3059\u3079\u3066\u306e\u30e6\u30fc\u30b6\u30fc\uff08root\u542b\u3080\uff09\u306b\u3088\u308b<code class=\"previewInlineCode_f755fc7f\">gdb<\/code>\u3001<code class=\"previewInlineCode_f755fc7f\">strace -p<\/code>\u7b49\u306e\u30c7\u30d0\u30c3\u30b0\u30c4\u30fc\u30eb\u306e\u4f7f\u7528\u304c\u4e0d\u53ef\u3068\u306a\u308b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2>\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li>\u672c\u66ab\u5b9a\u5bfe\u51e6\u304a\u3088\u3073\u5bfe\u51e6\u65b9\u6cd5\u306f\u3001\u304a\u5ba2\u69d8\u306e\u8cac\u4efb\u306b\u304a\u3044\u3066\u5b9f\u65bd\u3057\u3066\u304f\u3060\u3055\u3044<\/li>\n<li>\u672c\u4ef6\u306f\u5f0a\u793e\u4fdd\u8a3c\u5bfe\u8c61\u5916\u3068\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3059<\/li>\n<li>\u30d1\u30c3\u30c1\u306e\u30ea\u30ea\u30fc\u30b9\u72b6\u6cc1\u306f\u5404\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30bf\u30fc\u306e\u516c\u5f0f\u60c5\u5831\u3092\u3054\u78ba\u8a8d\u304f\u3060\u3055\u3044<\/li>\n<li>\u672c\u60c5\u5831\u306f2026\u5e745\u670819\u65e5\u73fe\u5728\u306e\u72b6\u6cc1\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002\u6700\u65b0\u60c5\u5831\u306f\u5404\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30bf\u30fc\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a2\u30c9\u30d0\u30a4\u30b6\u30ea\u3092\u3054\u53c2\u7167\u304f\u3060\u3055\u3044<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Security Risk \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u5bfe\u7b56 \u7279\u8a2d\u30da\u30fc\u30b8 \u30db\u30fc\u30e0 &gt; \u30b5\u30dd\u30fc\u30c8 &gt; \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u5bfe\u7b56\u7279\u8a2d\u30da\u30fc\u30b8 &gt; Linux\u30ab\u30fc\u30cd\u30eb\u8106\u5f31\u6027\uff08CVE-2026-46333: ssh-keys&#8230;<\/p>\n","protected":false},"author":37,"featured_media":0,"parent":0,"menu_order":11,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1026","page","type-page","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"Security Risk \u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30ea\u30b9\u30af\u5bfe\u7b56 \u7279\u8a2d\u30da\u30fc\u30b8 \u30db\u30fc\u30e0 &gt; \u30b5\u30dd\u30fc\u30c8 &gt; \u30bb\u30ad\u30e5\u30ea\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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