{"id":160,"date":"2018-10-31T09:35:05","date_gmt":"2018-10-31T01:35:05","guid":{"rendered":"http:\/\/www.subingkang.com\/?p=160"},"modified":"2018-10-31T10:21:27","modified_gmt":"2018-10-31T02:21:27","slug":"%e8%b0%88%e4%b8%80%e8%b0%88php-filter%e7%9a%84%e5%a6%99%e7%94%a8","status":"publish","type":"post","link":"https:\/\/subk.me\/?p=160","title":{"rendered":"\u8c08\u4e00\u8c08php:\/\/filter\u7684\u5999\u7528"},"content":{"rendered":"

php:\/\/filter\u662fPHP\u4e2d\u72ec\u6709\u7684\u534f\u8bae\uff0c\u5229\u7528\u8fd9\u4e2a\u534f\u8bae\u53ef\u4ee5\u521b\u9020\u5f88\u591a\u201c\u5999\u7528\u201d\uff0c\u672c\u6587\u8bf4\u51e0\u4e2a\u6709\u610f\u601d\u7684\u70b9\uff0c\u5269\u4e0b\u7684\u5927\u5bb6\u81ea\u5df1\u4e0b\u53bb\u4f53\u4f1a\u3002\u672c\u6765\u672c\u6587\u7684\u601d\u8def\u6211\u4e0a\u534a\u5e74\u5c31\u51c6\u5907\u62ff\u6765\u505aXDCTF2016\u7684\u9898\u76ee\u7684\uff0c\u6ca1\u60f3\u5230\u88ab\u4e09\u4e2a\u767d\u5e3d\u7684\u4e00\u9898\u62a2\u5148\u7528\u4e86\uff0c\u6211\u4e5f\u5c31\u53ea\u597d\u63d0\u524d\u5206\u4eab\u4e00\u4e0b\u3002<\/p>\n

XXE\u4e2d\u7684\u4f7f\u7528<\/a><\/h2>\n

php:\/\/filter\u4e4b\u524d\u6700\u5e38\u51fa\u955c\u7684\u5730\u65b9\u662fXXE\u3002\u7531\u4e8eXXE\u6f0f\u6d1e\u7684\u7279\u6b8a\u6027\uff0c\u6211\u4eec\u5728\u8bfb\u53d6HTML\u3001PHP\u7b49\u6587\u4ef6\u65f6\u53ef\u80fd\u4f1a\u629b\u51fa\u6b64\u7c7b\u9519\u8befparser error : StartTag: invalid element name<\/code>\u00a0\u3002\u5176\u539f\u56e0\u662f\uff0cPHP\u662f\u57fa\u4e8e\u6807\u7b7e\u7684\u811a\u672c\u8bed\u8a00\uff0c<?php ... ?><\/code>\u8fd9\u4e2a\u8bed\u6cd5\u4e5f\u4e0eXML\u76f8\u7b26\u5408\uff0c\u6240\u4ee5\u5728\u89e3\u6790XML\u7684\u65f6\u5019\u4f1a\u88ab\u8bef\u8ba4\u4e3a\u662fXML\uff0c\u800c\u5176\u4e2d\u5185\u5bb9\uff08\u6bd4\u5982\u7279\u6b8a\u5b57\u7b26\uff09\u53c8\u6709\u53ef\u80fd\u548c\u6807\u51c6XML\u51b2\u7a81\uff0c\u6240\u4ee5\u5bfc\u81f4\u4e86\u51fa\u9519\u3002<\/p>\n

\u90a3\u4e48\uff0c\u4e3a\u4e86\u8bfb\u53d6\u5305\u542b\u6709\u654f\u611f\u4fe1\u606f\u7684PHP\u7b49\u6e90\u6587\u4ef6\uff0c\u6211\u4eec\u5c31\u8981\u5148\u5c06\u201c\u53ef\u80fd\u5f15\u53d1\u51b2\u7a81\u7684PHP\u4ee3\u7801\u201d\u7f16\u7801\u4e00\u904d\uff0c\u8fd9\u91cc\u5c31\u4f1a\u7528\u5230php:\/\/filter\u3002<\/p>\n

php:\/\/filter\u662fPHP\u8bed\u8a00\u4e2d\u7279\u6709\u7684\u534f\u8bae\u6d41\uff0c\u4f5c\u7528\u662f\u4f5c\u4e3a\u4e00\u4e2a\u201c\u4e2d\u95f4\u6d41\u201d\u6765\u5904\u7406\u5176\u4ed6\u6d41\u3002\u6bd4\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u5982\u4e0b\u4e00\u884c\u4ee3\u7801\u5c06POST\u5185\u5bb9\u8f6c\u6362\u6210base64\u7f16\u7801\u5e76\u8f93\u51fa\uff1a<\/p>\n

readfile("php:\/\/filter\/read=convert.base64-encode\/resource=php:\/\/input");<\/code><\/p>\n

\u5982\u4e0b\uff1a<\/p>\n

\"QQ\u622a\u56fe20160724234603.png\"<\/a><\/p>\n

\u6240\u4ee5\uff0c\u5728XXE\u4e2d\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u5c06PHP\u7b49\u5bb9\u6613\u5f15\u53d1\u51b2\u7a81\u7684\u6587\u4ef6\u6d41\u7528php:\/\/filter\u534f\u8bae\u6d41\u5904\u7406\u4e00\u904d\uff0c\u8fd9\u6837\u5c31\u80fd\u6709\u6548\u89c4\u907f\u7279\u6b8a\u5b57\u7b26\u9020\u6210\u6df7\u4e71\u3002<\/p>\n

\u5982\u4e0b\uff0c\u6211\u4eec\u4f7f\u7528\u7684\u662fphp:\/\/filter\/read=convert.base64-encode\/resource=.\/xxe.php<\/code><\/p>\n

\"QQ\u622a\u56fe20160724235335.png\"<\/a><\/p>\n

\u5de7\u7528\u7f16\u7801\u4e0e\u89e3\u7801<\/a><\/h2>\n

\u4f7f\u7528\u7f16\u7801\u4e0d\u5149\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u83b7\u53d6\u6587\u4ef6\uff0c\u4e5f\u53ef\u4ee5\u5e2e\u6211\u4eec\u53bb\u9664\u4e00\u4e9b\u201c\u4e0d\u5fc5\u8981\u7684\u9ebb\u70e6\u201d\u3002<\/p>\n

\u8bb0\u5f97\u524d\u6bb5\u65f6\u95f4\u4e09\u4e2a\u767d\u5e3d\u6709\u4e2a\u6bd4\u8d5b\uff0c\u5176\u4e2d\u6709\u4e00\u90e8\u5206\u4ee3\u7801\u5927\u6982\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\uff1a<\/p>\n

\n
<?php<\/span>\n$content<\/span> =<\/span> ''<\/span>\n;<\/span>\n$content<\/span> .=<\/span> $_POST<\/span>\n[<\/span>\n'txt'<\/span>\n];<\/span>\nfile_put_contents<\/span>\n(<\/span>\n$_POST<\/span>\n[<\/span>\n'filename'<\/span>\n],<\/span> $content<\/span>\n);<\/span>\n<\/pre>\n<\/div>\n
$content<\/code>\u5728\u5f00\u5934\u589e\u52a0\u4e86exit\u8fc7\u7a0b\uff0c\u5bfc\u81f4\u5373\u4f7f\u6211\u4eec\u6210\u529f\u5199\u5165\u4e00\u53e5\u8bdd\uff0c\u4e5f\u6267\u884c\u4e0d\u4e86\uff08\u8fd9\u4e2a\u8fc7\u7a0b\u5728\u5b9e\u6218\u4e2d\u5341\u5206\u5e38\u89c1\uff0c\u901a\u5e38\u51fa\u73b0\u5728\u7f13\u5b58\u3001\u914d\u7f6e\u6587\u4ef6\u7b49\u7b49\u5730\u65b9\uff0c\u4e0d\u5141\u8bb8\u7528\u6237\u76f4\u63a5\u8bbf\u95ee\u7684\u6587\u4ef6\uff0c\u90fd\u4f1a\u88ab\u52a0\u4e0aif(!defined(xxx))exit;\u4e4b\u7c7b\u7684\u9650\u5236\uff09\u3002\u90a3\u4e48\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5982\u4f55\u7ed5\u8fc7\u8fd9\u4e2a\u201c\u6b7b\u4ea1exit\u201d\uff1f<\/p>\n
\u5e78\u8fd0\u7684\u662f\uff0c\u8fd9\u91cc\u7684$_POST['filename']<\/code>\u662f\u53ef\u4ee5\u63a7\u5236\u534f\u8bae\u7684\uff0c\u6211\u4eec\u5373\u53ef\u4f7f\u7528 php:\/\/filter\u534f\u8bae\u6765\u65bd\u5c55\u9b54\u6cd5\uff1a\u4f7f\u7528php:\/\/filter\u6d41\u7684base64-decode\u65b9\u6cd5\uff0c\u5c06$content<\/code>\u89e3\u7801\uff0c\u5229\u7528php base64_decode\u51fd\u6570\u7279\u6027\u53bb\u9664\u201c\u6b7b\u4ea1exit\u201d\u3002<\/p>\n
\u4f17\u6240\u5468\u77e5\uff0cbase64\u7f16\u7801\u4e2d\u53ea\u5305\u542b64\u4e2a\u53ef\u6253\u5370\u5b57\u7b26\uff0c\u800cPHP\u5728\u89e3\u7801base64\u65f6\uff0c\u9047\u5230\u4e0d\u5728\u5176\u4e2d\u7684\u5b57\u7b26\u65f6\uff0c\u5c06\u4f1a\u8df3\u8fc7\u8fd9\u4e9b\u5b57\u7b26\uff0c\u4ec5\u5c06\u5408\u6cd5\u5b57\u7b26\u7ec4\u6210\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u8fdb\u884c\u89e3\u7801\u3002<\/p>\n
\u6240\u4ee5\uff0c\u4e00\u4e2a\u6b63\u5e38\u7684base64_decode\u5b9e\u9645\u4e0a\u53ef\u4ee5\u7406\u89e3\u4e3a\u5982\u4e0b\u4e24\u4e2a\u6b65\u9aa4\uff1a<\/p>\n
\n
<?php<\/span>\n$_GET<\/span>\n[<\/span>\n'txt'<\/span>\n]<\/span> =<\/span> preg_replace<\/span>\n(<\/span>\n'|[^a-z0-9A-Z+\/]|s'<\/span>\n,<\/span> ''<\/span>\n,<\/span> $_GET<\/span>\n[<\/span>\n'txt'<\/span>\n]);<\/span>\nbase64_decode<\/span>\n(<\/span>\n$_GET<\/span>\n[<\/span>\n'txt'<\/span>\n]);<\/span>\n<\/pre>\n<\/div>\n
\u6240\u4ee5\uff0c\u5f53$content<\/code>\u88ab\u52a0\u4e0a\u4e86<?php exit; ?><\/code>\u4ee5\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 php:\/\/filter\/write=convert.base64-decode \u6765\u9996\u5148\u5bf9\u5176\u89e3\u7801\u3002\u5728\u89e3\u7801\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5b57\u7b26\u3001\u7a7a\u683c\u7b49\u4e00\u5171\u67097\u4e2a\u5b57\u7b26\u4e0d\u7b26\u5408base64\u7f16\u7801\u7684\u5b57\u7b26\u8303\u56f4\u5c06\u88ab\u5ffd\u7565\uff0c\u6240\u4ee5\u6700\u7ec8\u88ab\u89e3\u7801\u7684\u5b57\u7b26\u4ec5\u6709\u201cphpexit\u201d\u548c\u6211\u4eec\u4f20\u5165\u7684\u5176\u4ed6\u5b57\u7b26\u3002<\/p>\n
\u201cphpexit\u201d\u4e00\u51717\u4e2a\u5b57\u7b26\uff0c\u56e0\u4e3abase64\u7b97\u6cd5\u89e3\u7801\u65f6\u662f4\u4e2abyte\u4e00\u7ec4\uff0c\u6240\u4ee5\u7ed9\u4ed6\u589e\u52a01\u4e2a\u201ca\u201d\u4e00\u51718\u4e2a\u5b57\u7b26\u3002\u8fd9\u6837\uff0c”phpexita”\u88ab\u6b63\u5e38\u89e3\u7801\uff0c\u800c\u540e\u9762\u6211\u4eec\u4f20\u5165\u7684webshell\u7684base64\u5185\u5bb9\u4e5f\u88ab\u6b63\u5e38\u89e3\u7801\u3002\u7ed3\u679c\u5c31\u662f<?php exit; ?><\/code>\u6ca1\u6709\u4e86\u3002<\/p>\n
\u6700\u540e\u6548\u679c\u662f \uff1a<\/p>\n
\"QQ\u622a\u56fe20160725005316.png\"<\/a><\/p>\n
\u5229\u7528\u5b57\u7b26\u4e32\u64cd\u4f5c\u65b9\u6cd5<\/a><\/h2>\n
\u6709\u7684\u540c\u5b66\u8bf4\uff0cbase64\u7684\u7b97\u6cd5\u6211\u4e0d\u61c2\uff0c\u4e0a\u9762\u7684\u65b9\u6cd5\u592a\u590d\u6742\u4e86\u3002<\/p>\n
\u5176\u5b9e\uff0c\u9664\u4e86\u4f7f\u7528base64\u7279\u6027\u7684\u65b9\u6cd5\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5229\u7528php:\/\/filter\u5b57\u7b26\u4e32\u5904\u7406\u65b9\u6cd5\u6765\u53bb\u9664\u201c\u6b7b\u4ea1exit\u201d\u3002\u6211\u4eec\u89c2\u5bdf\u4e00\u4e0b\uff0c\u8fd9\u4e2a<?php exit; ?><\/code>\u5b9e\u9645\u4e0a\u662f\u4ec0\u4e48\uff1f<\/p>\n
\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2aXML\u6807\u7b7e\uff0c\u65e2\u7136\u662fXML\u6807\u7b7e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u5229\u7528strip_tags\u51fd\u6570\u53bb\u9664\u5b83\uff0c\u800cphp:\/\/filter\u521a\u597d\u662f\u652f\u6301\u8fd9\u4e2a\u65b9\u6cd5\u7684\u3002<\/p>\n
\u7f16\u5199\u5982\u4e0b\u6d4b\u8bd5\u4ee3\u7801\u5373\u53ef\u67e5\u770b php:\/\/filter\/read=string.strip_tags\/resource=php:\/\/input \u7684\u6548\u679c\uff1a<\/p>\n
echo readfile('php:\/\/filter\/read=string.strip_tags\/resource=php:\/\/input');<\/code><\/p>\n
\"QQ\u622a\u56fe20160725010403.png\"<\/a><\/p>\n
\u53ef\u89c1\uff0c<?php exit; ?><\/code>\u88ab\u53bb\u9664\u4e86\u3002\u4f46\u56de\u5230\u4e0a\u9762\u7684\u9898\u76ee\uff0c\u6211\u4eec\u6700\u7ec8\u7684\u76ee\u7684\u662f\u5199\u5165\u4e00\u4e2awebshell\uff0c\u800c\u5199\u5165\u7684webshell\u4e5f\u662fphp\u4ee3\u7801\uff0c\u5982\u679c\u4f7f\u7528strip_tags\u540c\u6837\u4f1a\u88ab\u53bb\u9664\u3002<\/p>\n
\u4e07\u5e78\u7684\u662f\uff0cphp:\/\/filter\u5141\u8bb8\u4f7f\u7528\u591a\u4e2a\u8fc7\u6ee4\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5148\u5c06webshell\u7528base64\u7f16\u7801\u3002\u5728\u8c03\u7528\u5b8c\u6210strip_tags\u540e\u518d\u8fdb\u884cbase64-decode\u3002\u201c\u6b7b\u4ea1exit\u201d\u5728\u7b2c\u4e00\u6b65\u88ab\u53bb\u9664\uff0c\u800cwebshell\u5728\u7b2c\u4e8c\u6b65\u88ab\u8fd8\u539f\u3002<\/p>\n
\u6700\u7ec8\u7684\u6570\u636e\u5305\u5982\u4e0b\uff1a<\/p>\n
\"QQ\u622a\u56fe20160725011007.png\"<\/a><\/p>\n
\u9664\u6b64\u4e4b\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u5229\u7528rot13\u7f16\u7801\u72ec\u7acb\u5b8c\u6210\u4efb\u52a1\u3002\u539f\u7406\u548c\u4e0a\u9762\u7c7b\u4f3c\uff0c\u6838\u5fc3\u662f\u5c06\u201c\u6b7b\u4ea1exit\u201d\u53bb\u9664\u3002<?php exit; ?><\/code>\u5728\u7ecf\u8fc7rot13\u7f16\u7801\u540e\u4f1a\u53d8\u6210<?cuc rkvg; ?><\/code>\uff0c\u5728PHP\u4e0d\u5f00\u542fshort_open_tag\u65f6\uff0cphp\u4e0d\u8ba4\u8bc6\u8fd9\u4e2a\u5b57\u7b26\u4e32\uff0c\u5f53\u7136\u4e5f\u5c31\u4e0d\u4f1a\u6267\u884c\u4e86\uff1a<\/p>\n
\"QQ\u622a\u56fe20160725012639.png\"<\/a><\/p>\n
\u5f53\u7136\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u6761\u4ef6\u5c31\u662f\u4e0d\u5f00\u542f\u77ed\u6807\u7b7e\u3002<\/p>\n
 <\/p>\n
From\uff1ahttps:\/\/www.leavesongs.com\/PENETRATION\/php-filter-magic.html<\/a><\/p>","protected":false},"excerpt":{"rendered":"
php:\/\/filter\u662fPHP\u4e2d\u72ec\u6709\u7684\u534f\u8bae\uff0c\u5229\u7528\u8fd9\u4e2a\u534f\u8bae\u53ef\u4ee5\u521b\u9020\u5f88\u591a\u201c\u5999\u7528\u201d\uff0c\u672c\u6587\u8bf4\u51e0\u4e2a\u6709\u610f\u601d\u7684\u70b9\uff0c\u5269\u4e0b\u7684\u5927 […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[21],"class_list":["post-160","post","type-post","status-publish","format-standard","hentry","category-security","tag-php-filter"],"_links":{"self":[{"href":"https:\/\/subk.me\/index.php?rest_route=\/wp\/v2\/posts\/160","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/subk.me\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/subk.me\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/subk.me\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/subk.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=160"}],"version-history":[{"count":1,"href":"https:\/\/subk.me\/index.php?rest_route=\/wp\/v2\/posts\/160\/revisions"}],"predecessor-version":[{"id":161,"href":"https:\/\/subk.me\/index.php?rest_route=\/wp\/v2\/posts\/160\/revisions\/161"}],"wp:attachment":[{"href":"https:\/\/subk.me\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/subk.me\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/subk.me\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}