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custom xp_cmdshell on SQL Server
From: "Andy Lester" <pentest1269 () hotmail com>
Date: Wed, 13 Sep 2006 17:29:16 +0200

Hello list,

I am pen-testing a web app that is vulnerable to SQL Injection. The queries to the backend DB are done with a non-privileged user, but using OPENROWSET and inference-based injection I have been able to find the sa password and escalate privileges. However, xp_cmdshell seems to have been disabled, so I am trying to create a custom one with 'CREATE PROCEDURE'. The probles is that while 'CREATE PROCEDURE' works perfectly with "native" sa privileges (i.e.: without the OPENROWSET escalation), it is not working combined with the privilege escalation (i.e.: inside the OPENROWSET).

More specifically, I am trying injecting the following query (using a test SQL Server 2000): select * from OPENROWSET('SQLOLEDB','';'sa';<password>,'declare @x nvarchar(1000);set @x = ''CREATE PROCEDURE customshell<snip>'';exec master..sp_executesql @x;select 1')

The 'select 1' is added because OPENROWSET expects some data. The query runs correctly without errors but the custom procedure is not created.

Any ideas on how to create such a custom procedure in a privilege escalation scenario ?

I hope it all makes sense, and sorry for the long post.


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