{"id":51217,"date":"2024-10-08T16:56:14","date_gmt":"2024-10-08T08:56:14","guid":{"rendered":"https:\/\/server.hk\/cnblog\/51217\/"},"modified":"2024-11-14T10:44:13","modified_gmt":"2024-11-14T02:44:13","slug":"cve-2020-8835-%e6%bc%8f%e6%b4%9e%ef%bc%9a%e5%bd%b1%e9%9f%bf-ubuntu-19-10-%e8%88%87-ubuntu-18-04","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/51217\/","title":{"rendered":"CVE-2020-8835 \u6f0f\u6d1e\uff1a\u5f71\u97ff Ubuntu 19.10 \u8207 Ubuntu 18.04"},"content":{"rendered":"<h1 id=\"cve-2020-8835-%e6%bc%8f%e6%b4%9e%ef%bc%9a%e5%bd%b1%e9%9f%bf-ubuntu-19-10-%e8%88%87-ubuntu-18-04-CbDDNFnSPF\">CVE-2020-8835 \u6f0f\u6d1e\uff1a\u5f71\u97ff Ubuntu 19.10 \u8207 Ubuntu 18.04<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u4f4d\u6642\u4ee3\uff0c\u5b89\u5168\u6027\u6210\u70ba\u4e86\u6bcf\u500b\u7cfb\u7d71\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u5fc5\u9808\u91cd\u8996\u7684\u8b70\u984c\u3002\u96a8\u8457\u5404\u7a2e\u6f0f\u6d1e\u7684\u51fa\u73fe\uff0c\u4e86\u89e3\u9019\u4e9b\u6f0f\u6d1e\u7684\u5f71\u97ff\u53ca\u5176\u4fee\u88dc\u65b9\u6cd5\u8b8a\u5f97\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e CVE-2020-8835 \u6f0f\u6d1e\uff0c\u8a72\u6f0f\u6d1e\u5f71\u97ff\u4e86 Ubuntu 19.10 \u548c Ubuntu 18.04 \u7248\u672c\u3002<\/p>\n<h2 id=\"%e6%bc%8f%e6%b4%9e%e6%a6%82%e8%bf%b0-CbDDNFnSPF\">\u6f0f\u6d1e\u6982\u8ff0<\/h2>\n<p>CVE-2020-8835 \u662f\u4e00\u500b\u5f71\u97ff Ubuntu \u7cfb\u7d71\u7684\u5b89\u5168\u6f0f\u6d1e\uff0c\u4e3b\u8981\u6d89\u53ca Linux \u6838\u5fc3\u4e2d\u7684\u4e00\u500b\u7279\u5b9a\u529f\u80fd\u3002\u8a72\u6f0f\u6d1e\u7684\u5b58\u5728\u53ef\u80fd\u5141\u8a31\u672c\u5730\u7528\u6236\u901a\u904e\u7279\u88fd\u7684\u7cfb\u7d71\u8abf\u7528\u4f86\u63d0\u5347\u5176\u6b0a\u9650\uff0c\u5f9e\u800c\u7372\u5f97\u5c0d\u7cfb\u7d71\u7684\u5b8c\u5168\u63a7\u5236\u6b0a\u3002\u9019\u610f\u5473\u8457\u653b\u64ca\u8005\u53ef\u4ee5\u5728\u53d7\u5f71\u97ff\u7684\u7cfb\u7d71\u4e0a\u57f7\u884c\u4efb\u610f\u4ee3\u78bc\uff0c\u9019\u5c0d\u65bc\u4f3a\u670d\u5668\u548c\u5176\u4ed6\u95dc\u9375\u7cfb\u7d71\u4f86\u8aaa\u662f\u4e00\u500b\u56b4\u91cd\u7684\u5b89\u5168\u5a01\u8105\u3002<\/p>\n<h2 id=\"%e5%8f%97%e5%bd%b1%e9%9f%bf%e7%9a%84%e7%89%88%e6%9c%ac-CbDDNFnSPF\">\u53d7\u5f71\u97ff\u7684\u7248\u672c<\/h2>\n<ul>\n<li>Ubuntu 19.10<\/li>\n<li>Ubuntu 18.04<\/li>\n<\/ul>\n<p>\u9019\u5169\u500b\u7248\u672c\u7684 Ubuntu \u90fd\u53d7\u5230 CVE-2020-8835 \u7684\u5f71\u97ff\uff0c\u56e0\u6b64\u7cfb\u7d71\u7ba1\u7406\u54e1\u9700\u8981\u7279\u5225\u6ce8\u610f\u9019\u4e9b\u7248\u672c\u7684\u5b89\u5168\u6027\u3002<\/p>\n<h2 id=\"%e6%bc%8f%e6%b4%9e%e7%9a%84%e6%8a%80%e8%a1%93%e7%b4%b0%e7%af%80-CbDDNFnSPF\">\u6f0f\u6d1e\u7684\u6280\u8853\u7d30\u7bc0<\/h2>\n<p>CVE-2020-8835 \u6f0f\u6d1e\u7684\u6839\u672c\u539f\u56e0\u5728\u65bc Linux \u6838\u5fc3\u4e2d\u7684\u4e00\u500b\u932f\u8aa4\uff0c\u8a72\u932f\u8aa4\u6d89\u53ca\u5230\u5c0d\u67d0\u4e9b\u7cfb\u7d71\u8abf\u7528\u7684\u8655\u7406\u4e0d\u7576\u3002\u5177\u9ad4\u4f86\u8aaa\uff0c\u7576\u7528\u6236\u57f7\u884c\u7279\u5b9a\u7684\u7cfb\u7d71\u8abf\u7528\u6642\uff0c\u7cfb\u7d71\u672a\u80fd\u6b63\u78ba\u6aa2\u67e5\u7528\u6236\u7684\u6b0a\u9650\uff0c\u9019\u4f7f\u5f97\u653b\u64ca\u8005\u80fd\u5920\u5229\u7528\u9019\u4e00\u9ede\u4f86\u63d0\u5347\u5176\u6b0a\u9650\u3002<\/p>\n<pre><code>\n# \u793a\u4f8b\u4ee3\u78bc\uff1a\u6a21\u64ec\u6f0f\u6d1e\u5229\u7528\n# \u8acb\u6ce8\u610f\uff0c\u9019\u50c5\u70ba\u793a\u7bc4\uff0c\u5be6\u969b\u5229\u7528\u884c\u70ba\u662f\u975e\u6cd5\u7684\n#include &lt;stdio.h&gt;\n#include &lt;unistd.h&gt;\n\nint main() {\n    \/\/ \u5617\u8a66\u57f7\u884c\u7279\u6b0a\u64cd\u4f5c\n    setuid(0); \/\/ \u63d0\u5347\u6b0a\u9650\n    system(\"whoami\"); \/\/ \u6aa2\u67e5\u7576\u524d\u7528\u6236\n    return 0;\n}\n<\/code><\/pre>\n<h2 id=\"%e5%bd%b1%e9%9f%bf%e8%88%87%e9%a2%a8%e9%9a%aa-CbDDNFnSPF\">\u5f71\u97ff\u8207\u98a8\u96aa<\/h2>\n<p>\u5982\u679c\u653b\u64ca\u8005\u6210\u529f\u5229\u7528 CVE-2020-8835 \u6f0f\u6d1e\uff0c\u4ed6\u5011\u53ef\u4ee5\u7372\u5f97\u7cfb\u7d71\u7684\u5b8c\u5168\u63a7\u5236\u6b0a\uff0c\u9019\u53ef\u80fd\u5c0e\u81f4\u4ee5\u4e0b\u5f8c\u679c\uff1a<\/p>\n<ul>\n<li>\u6578\u64da\u6d29\u9732\uff1a\u653b\u64ca\u8005\u53ef\u4ee5\u8a2a\u554f\u654f\u611f\u6578\u64da\u3002<\/li>\n<li>\u7cfb\u7d71\u7834\u58de\uff1a\u653b\u64ca\u8005\u53ef\u4ee5\u522a\u9664\u6216\u4fee\u6539\u7cfb\u7d71\u6587\u4ef6\u3002<\/li>\n<li>\u6301\u4e45\u6027\u5a01\u8105\uff1a\u653b\u64ca\u8005\u53ef\u4ee5\u5b89\u88dd\u5f8c\u9580\uff0c\u6301\u7e8c\u63a7\u5236\u7cfb\u7d71\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bf%ae%e8%a3%9c%e5%bb%ba%e8%ad%b0-CbDDNFnSPF\">\u4fee\u88dc\u5efa\u8b70<\/h2>\n<p>\u70ba\u4e86\u4fdd\u8b77\u7cfb\u7d71\u514d\u53d7 CVE-2020-8835 \u6f0f\u6d1e\u7684\u5f71\u97ff\uff0c\u5efa\u8b70\u7cfb\u7d71\u7ba1\u7406\u54e1\u7acb\u5373\u63a1\u53d6\u4ee5\u4e0b\u63aa\u65bd\uff1a<\/p>\n<ul>\n<li>\u66f4\u65b0\u7cfb\u7d71\uff1a\u78ba\u4fdd\u6240\u6709\u53d7\u5f71\u97ff\u7684 Ubuntu \u7cfb\u7d71\u90fd\u5df2\u66f4\u65b0\u5230\u6700\u65b0\u7248\u672c\uff0c\u4e26\u5b89\u88dd\u6240\u6709\u5b89\u5168\u88dc\u4e01\u3002<\/li>\n<li>\u76e3\u63a7\u7cfb\u7d71\uff1a\u5b9a\u671f\u6aa2\u67e5\u7cfb\u7d71\u65e5\u8a8c\uff0c\u5c0b\u627e\u53ef\u7591\u6d3b\u52d5\u3002<\/li>\n<li>\u9650\u5236\u7528\u6236\u6b0a\u9650\uff1a\u78ba\u4fdd\u7528\u6236\u50c5\u64c1\u6709\u57f7\u884c\u5176\u4efb\u52d9\u6240\u9700\u7684\u6700\u4f4e\u6b0a\u9650\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-CbDDNFnSPF\">\u7d50\u8ad6<\/h2>\n<p>CVE-2020-8835 \u6f0f\u6d1e\u5c0d\u65bc\u4f7f\u7528 Ubuntu 19.10 \u548c Ubuntu 18.04 \u7684\u7cfb\u7d71\u4f86\u8aaa\u662f\u4e00\u500b\u56b4\u91cd\u7684\u5b89\u5168\u5a01\u8105\u3002\u7cfb\u7d71\u7ba1\u7406\u54e1\u5fc5\u9808\u7acb\u5373\u63a1\u53d6\u884c\u52d5\uff0c\u66f4\u65b0\u7cfb\u7d71\u4e26\u52a0\u5f37\u5b89\u5168\u63aa\u65bd\uff0c\u4ee5\u9632\u6b62\u6f5b\u5728\u7684\u653b\u64ca\u3002\u96a8\u8457\u7db2\u7d61\u5b89\u5168\u5a01\u8105\u7684\u65e5\u76ca\u589e\u52a0\uff0c\u4fdd\u6301\u7cfb\u7d71\u7684\u6700\u65b0\u72c0\u614b\u548c\u5be6\u65bd\u6700\u4f73\u5b89\u5168\u5be6\u8e10\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE-2020-8835\u6f0f\u6d1e\u5f71\u97ffUbuntu 19.10\u820718.04\uff0c\u53ef\u80fd\u5c0e\u81f4\u5b89\u5168\u98a8\u96aa\uff0c\u5efa\u8b70\u7528\u6236\u53ca\u6642\u66f4\u65b0\u7cfb\u7d71\u4ee5\u9632\u7bc4\u653b\u64ca\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4924],"tags":[],"class_list":["post-51217","post","type-post","status-publish","format-standard","hentry","category-setup-tutorials"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/51217","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=51217"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/51217\/revisions"}],"predecessor-version":[{"id":51218,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/51217\/revisions\/51218"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=51217"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=51217"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=51217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}