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SQL Server Named Pipe Privilege Escalation Vulnerability
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Secunia Advisory:
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SA9229
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Release Date:
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2003-07-11
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Popularity:
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7,510 views
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Critical:
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Less critical
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Impact:
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Privilege escalation
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | Microsoft SQL Server 2000
Microsoft SQL Server 7
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| CVE reference: | CVE-2003-0496
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Description:
A vulnerability has been identified in SQL Server, which can be exploited by malicious, local users to escalate their privileges on a vulnerable system.
The vulnerability is caused due to a general error in the "CreateFile" API and an attack vector exists in SQL Server making it possible to gain the privileges of the SQL Server. This can be exploited by specifying the UNC name of a named pipe instead of a file as an argument to the "xp_fileexist" extended stored procedure.
An example is included in the original advisory.
Solution:
Generally, only trusted administrators should be allowed access to a server. Furthermore, services should be run with as few privileges as possible.
Microsoft has fixed this issue in Windows 2000 Service Pack 4 by introducing a new user right:
http://www.microsoft.com/windows2000/downloads/servicepacks/sp4/default.asp
Provided and/or discovered by:
Andreas Junestam (@stake)
Original Advisory:
http://www.atstake.com/research/advisories/2003/a070803-1.txt
Other References:
Microsoft knowledge base article about the new user right:
http://support.microsoft.com/default.aspx?scid=kb;[LN];821546
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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