{"id":931,"date":"2025-01-18T21:29:20","date_gmt":"2025-01-18T13:29:20","guid":{"rendered":"http:\/\/gzxingyu.cloud\/?p=931"},"modified":"2025-01-18T21:29:21","modified_gmt":"2025-01-18T13:29:21","slug":"fbctf2019rceservice","status":"publish","type":"post","link":"http:\/\/gzxingyu.cloud\/index.php\/2025\/01\/18\/fbctf2019rceservice\/","title":{"rendered":"FBCTF2019RCEService"},"content":{"rendered":"<p><img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201222050.png\" alt=\"Pasted image 20241201222050.png\"><\/p>\n<p>1.\u53d1\u73b0\u8981json\u683c\u5f0f<br \/>\nJSON\u7684\u8f93\u5165\u683c\u5f0f\u4e3b\u8981\u6709\u5bf9\u8c61\uff08\u7528\u82b1\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u5305\u542b\u952e\u503c\u5bf9\uff09\u548c\u6570\u7ec4\uff08\u7528\u65b9\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u503c\u4e4b\u95f4\u7528\u9017\u53f7\u5206\u9694\uff09\u4e24\u79cd\u57fa\u672c\u7ed3\u6784\uff0c\u952e\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\uff0c\u503c\u53ef\u4ee5\u662f\u591a\u79cd\u6570\u636e\u7c7b\u578b\u3002\u4f8b\u5982\u5bf9\u8c61\u683c\u5f0f\uff1a{&quot;name&quot;: &quot;John&quot;, &quot;age&quot;: 30}\uff0c\u6570\u7ec4\u683c\u5f0f\uff1a[1, 2, 3]\u7b49\u3002<br \/>\n<img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201222207.png\" alt=\"Pasted image 20241201222207.png\"><\/p>\n<p>\u5c1d\u8bd5\u8f93\u5165{&quot;cmd&quot;:&quot;ls&quot;}<br \/>\n\u53d1\u73b0index.php<br \/>\n<img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201222539.png\" alt=\"Pasted image 20241201222539.png\"><\/p>\n<p>2 .\u53d1\u73b0\u547d\u4ee4\u6b63\u5e38\u6267\u884c\uff0c\u51c6\u5907\u67e5\u770b\u6839\u76ee\u5f55\u7684\u6587\u4ef6\uff0c\u7531\u4e8e\u662f<code>get<\/code>\u4f20\u53c2\uff0c\u6240\u4ee5\u7a7a\u683c\u5148\u7f16\u7801\u4e3a<code>%20<\/code>\uff0c\u4f46\u662f\u53d1\u73b0\u56de\u663e<code>hacking<\/code>\uff0c\u7ecf\u8fc7\u6d4b\u8bd5\u53d1\u73b0\u662f\u5bf9<code>\/<\/code>\u8fdb\u884c\u4e86\u8fc7\u6ee4<\/p>\n<pre><code>{&quot;cmd&quot;:&quot;ls%20\/&quot;}\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201225558.png\" alt=\"Pasted image 20241201225558.png\"><\/p>\n<p>3.\u65e2\u7136\u4e0d\u80fd\u4f7f\u7528\/\uff0c\u90a3\u5c31\u76f4\u63a5\u4f7f\u7528<code>cat<\/code>\u547d\u4ee4\u67e5\u770b\u4e00\u4e0b<code>index.php<\/code>\u6587\u4ef6\uff0c\u53d1\u73b0\u8fd8\u662f\u4e0d\u884c\uff0c\u5c1d\u8bd5\u66f4\u6539<code>cat<\/code>\u7684\u683c\u5f0f\u8fdb\u884c\u7ed5\u8fc7\uff0c\u53d1\u73b0\u8fd8\u662f\u4e0d\u884c\u3002<\/p>\n<pre><code>{&quot;cmd&quot;:&quot;cat%20index.php&quot;}\n<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201225908.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201225908.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20241201225908.png\"><\/div><br \/>\n<img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201230050.png\" alt=\"Pasted image 20241201230050.png\"><\/p>\n<p>4.\u4ed4\u7ec6\u60f3\u60f3\uff0c\u65e2\u7136\u5b58\u5728\u8fc7\u6ee4\uff0c\u591a\u534a\u78b0\u5230\u7684\u51fd\u6570\u90fd\u662fpreg_match\uff0c\u8be5\u51fd\u6570\u53ef\u4ee5\u901a\u8fc7\u6362\u884c\u7b26%0a\u548c\u6570\u7ec4\u8fdb\u884c\u7ed5\u8fc7\uff0c\u56e0\u4e3a\u8be5\u51fd\u6570\u53ea\u4f1a\u5339\u914d\u7b2c\u4e00\u884c\u6570\u636e\uff0c\u9664\u975e\u8bbe\u7f6e\u4e86\u53c2\u6570\u3002\u6240\u4ee5\u9ed8\u8ba4\u4e3apreg_match\u51fd\u6570\u8fc7\u6ee4\uff0c\u6784\u5efapaylaod{%0a&quot;cmd&quot;:&quot;cat%20index.php&quot;%0a}\u3002\u53d1\u73b0\u8fd8\u662f\u4e0d\u884c\uff0c\u4f46\u662f\u53ef\u4ee5\u6267\u884cls \/\u547d\u4ee4\u4e86\uff0c\u8bc1\u660e\u524d\u9762\u731c\u6d4b\u6ca1\u95ee\u9898\uff0c\u8fd8\u7ed5\u8fc7\u6765\u4e86\u8fc7\u6ee4<br \/>\n\u6ce8\u610f\uff1a\u7528url\u4f20\u53c2\uff0c\u4e0d\u7136\u4f1a\u5728\u8f93\u5165\u6846\u8f93\u5165\u8fdb\u884curl\u7f16\u7801\uff0c\u5bfc\u81f4\u65e0\u6cd5\u8bc6\u522b<\/p>\n<pre><code>{%0a&quot;cmd&quot;:&quot;ls%20\/&quot;%0a}\n<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201230810.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201230810.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"Pasted image 20241201230810.png\"><\/div><br \/>\n<img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201234250.png\" alt=\"Pasted image 20241201234250.png\"><\/p>\n<p>5.\u90a3\u4e3a\u4ec0\u4e48<code>cat<\/code>\u547d\u4ee4\u8fd8\u4e0d\u884c\u6267\u884c\u5462\uff0c\u90fd\u5df2\u7ecf\u7ed5\u8fc7\u4e86\u8fc7\u6ee4\u3002\u5176\u5b9e\u5728\u6ca1\u6709\u9650\u5236\u7684\u60c5\u51b5\u4e0b\u547d\u4ee4\u8fd8\u4e0d\u80fd\u6267\u884c\uff0c\u53ea\u80fd\u662f\u8be5\u547d\u4ee4\u88ab\u5c4f\u853d\u4e86\uff0c\u4f46\u662f\u4f7f\u7528\u5176\u4ed6\u67e5\u770b\u6587\u4ef6\u7684\u547d\u4ee4\u4e5f\u90fd\u4e0d\u53ef\u4ee5\u3002<\/p>\n<p>6.\u90a3\u53ef\u80fd\u5c31\u662f\u73af\u5883\u53d8\u91cf\u88ab\u66f4\u6539\u4e86\uff0c\u9700\u8981\u4f7f\u7528\u547d\u4ee4\u7684\u7edd\u5bf9\u8def\u5f84\u6765\u6267\u884c\uff0c\u4e5f\u5c31\u662f<code>\/bin\/cat<\/code>\u3002\u518d\u6b21\u6784\u5efapaylaod<code>{%0a&quot;cmd&quot;:&quot;\/bin\/cat%20index.php&quot;%0a}<\/code>\u3002\u6210\u529f\u56de\u663e\u4e86\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n<pre><code>{%0a&quot;cmd&quot;:&quot;\/bin\/cat%20index.php&quot;%0a}\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201231231.png\" alt=\"Pasted image 20241201231231.png\"><\/p>\n<p>7.\u53d1\u73b0\u8fc7\u6ee4\u51fd\u6570\u786e\u5b9e\u662f<code>preg_match<\/code>\uff0c\u4ee3\u7801\u7684\u4e00\u5f00\u59cb\u5c31\u5c06\u73af\u5883\u53d8\u91cf\u4fee\u6539\u4e86\uff0c\u65e2\u7136<code>flag<\/code>\u4e0d\u5728\u6839\u76ee\u5f55\u4e0b\uff0c\u90a3\u5f88\u53ef\u80fd\u5c31\u5728\u8fd9\u4e2a\u73af\u5883\u53d8\u91cf\u4e2d\uff0c\u67e5\u770b\u73af\u5883\u53d8\u91cf\u76ee\u5f55\u7ed3\u6784\uff0c\u53d1\u73b0\u4e86<code>flag<\/code>\u76ee\u5f55\uff0c<code>cat<\/code>\u547d\u4ee4\u76f4\u63a5\u62ff\u4e0b<code>flag<\/code><br \/>\n\u6ce8\uff1a\u56e0\u4e3acat\u547d\u4ee4\u7c7b\u4f3c\u4e8eexe\u6587\u4ef6\uff0c\u914d\u7f6e\u73af\u5883\u53d8\u91cf\u5c31\u53ef\u4ee5\u5728\u4efb\u4f55\u5730\u65b9\u4f7f\u7528<\/p>\n<pre><code>{%0a&quot;cmd&quot;:&quot;ls%20\/home\/rceservice&quot;%0a}\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201231819.png\" alt=\"Pasted image 20241201231819.png\"><\/p>\n<pre><code>{%0a&quot;cmd&quot;:&quot;\/bin\/cat \/home\/rceservice\/flag&quot;%0a}\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"http:\/\/gzxingyu.cloud\/wp-content\/uploads\/2025\/01\/Pasted-image-20241201232702.png\" alt=\"Pasted image 20241201232702.png\"><\/p>\n<h3>\u603b\u7ed3<\/h3>\n<h4>RCE\u7ed5\u8fc7<\/h4>\n<ul>\n<li>\u73af\u5883\u53d8\u91cf\u7ed5\u8fc7 \/bin\/cat<\/li>\n<li>\u6b63\u5219\u5339\u914d\u7ed5\u8fc7 %0a \u6570\u7ec4<\/li>\n<\/ul>\n<h4>JSON<\/h4>\n<p>JSON\u7684\u8f93\u5165\u683c\u5f0f\u4e3b\u8981\u6709\u5bf9\u8c61\uff08\u7528\u82b1\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u5305\u542b\u952e\u503c\u5bf9\uff09\u548c\u6570\u7ec4\uff08\u7528\u65b9\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u503c\u4e4b\u95f4\u7528\u9017\u53f7\u5206\u9694\uff09\u4e24\u79cd\u57fa\u672c\u7ed3\u6784\uff0c\u952e\u5fc5\u987b\u662f\u5b57\u7b26\u4e32\uff0c\u503c\u53ef\u4ee5\u662f\u591a\u79cd\u6570\u636e\u7c7b\u578b\u3002\u4f8b\u5982\u5bf9\u8c61\u683c\u5f0f\uff1a{&quot;name&quot;: &quot;John&quot;, &quot;age&quot;: 30}\uff0c\u6570\u7ec4\u683c\u5f0f\uff1a[1, 2, 3]\u7b49<\/p>\n<h4>\u4f7f\u7528url\u4f20\u53c2<\/h4>\n<p>\u4f7f\u7528\u8f93\u5165\u6846\u4f20\u53c2\u4f1a\u8fdb\u884c\u7f16\u7801\uff0curl\u65e0\u6cd5\u8bc6\u522b<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1.\u53d1\u73b0\u8981json\u683c\u5f0f JSON\u7684\u8f93\u5165\u683c\u5f0f\u4e3b\u8981\u6709\u5bf9\u8c61\uff08\u7528\u82b1\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u5305\u542b\u952e\u503c\u5bf9\uff09\u548c\u6570\u7ec4\uff08\u7528\u65b9\u62ec\u53f7\u62ec\u8d77\u6765\uff0c\u503c\u4e4b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,8,22],"tags":[26,29],"class_list":["post-931","post","type-post","status-publish","format-standard","hentry","category-buuctf","category-ctf","category-ctf-web","tag-rce","tag-29"],"_links":{"self":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/931","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=931"}],"version-history":[{"count":1,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/931\/revisions"}],"predecessor-version":[{"id":932,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/posts\/931\/revisions\/932"}],"wp:attachment":[{"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/media?parent=931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/categories?post=931"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/gzxingyu.cloud\/index.php\/wp-json\/wp\/v2\/tags?post=931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}