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[sec-adv] SQL Server Named Pipe Privilege Escalation Vulnerability
From: Secunia Security Advisories (sec-adv
secunia.com)
Date: Fri Jul 11 2003 - 03:49:24 CDT
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TITLE:
SQL Server Named Pipe Privilege Escalation Vulnerability
READ ONLINE:
http://www.secunia.com/advisories/9229/
CRITICAL:
Less critical
IMPACT:
Privilege escalation
WHERE:
Local system
SOFTWARE:
Microsoft SQL Server 7
Microsoft SQL Server 2000
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
REPORTED BY / CREDITS:
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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