Description
攻击者通过利用易受攻击的代码，在权限范围内能够上传任意文件到服务器，造成严重的系统损害。
关于U8cloud系统3.1-5.1sp存在hrmobile接口任意文件上传漏洞的安全公告
PoC
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https://www.ufida168.com/case_detail/3201.html
https://cn-sec.com/archives/3950788.html
https://github.com/Threekiii/Vulnerability-Wiki/blob/master/docs-base/docs/oa/%E7%94%A8%E5%8F%8B-U8-cloud-upload.jsp-%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%BC%8F%E6%B4%9E.md
https://www.cnblogs.com/Domren/articles/19242469