Subject: Microsoft SQL Server 2005 sp_replwritetovarbin memory overwrite
(update to SEC Consult SA-20081209)
From: Bernhard Mueller <research@sec-consult.com.>
To: Full Disclosure <full-disclosure@lists.grok.org.uk.>,
Bugtraq <bugtraq@securityfocus.com.>
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Date: Wed, 10 Dec 2008 13:45:02 +0100
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Update to SEC Consult Security Advisory 20081210-0
(Microsoft SQL Server sp_replwritetovarbin limited memory overwrite
vulnerability)
Summary:
------------
By calling the extended stored procedure sp_replwritetovarbin, an
attacker can write limited values to arbitrary locations in process
memory. This vulnerability has been described in a prior security
advisory for MS SQL Server 2000:
http://www.securityfocus.com/archive/1/499042
Moreno Zilli of Swisscom has reported that MS SQL Server 2005 is
vulnerable to the same attack. This has been confirmed in a lab test
conducted by SEC Consult.
Our public security advisory has been updated accordingly:
http://www.sec-consult.com/files/20081209_mssql-sp_replwritetovarbin_memwrite.txt
Workaround:
Remove the sp_replwriterovarbin extended stored procedure. Run the
following as an administrator:
execute dbo.sp_dropextendedproc 'sp_replwritetovarbin'
See also:
"Removing an Extended Stored Procedure from SQL Server"
http://msdn.microsoft.com/en-us/library/aa215995(SQL.80).aspx
Patch:
According to an email received by Microsoft in September, a fix for this
vulnerability has been completed.
The release schedule for this fix is currently unknown.
Vendor timeline:
---------------
Vendor notified: 2008-04-17
Vendor response: 2008-04-17
Last response from Microsoft: 09-29-2008
Request for update status 1: 10-14-2008
Request for update status 2: 10-29-2008
Request for update status 3: 11-12-2008
Request for update status 4
and prenotification about advisory release date: 11-28-2008
Public release: 12-09-2008
Update (added MS-SQL 2005): 12-10-2008
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EOF Bernhard Mueller / @2008
