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.
Andy
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