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TITLE:
Microsoft SQL Server 2000 "sp_replwritetovarbin()" Buffer Overflow

SECUNIA ADVISORY ID:
SA33034

VERIFY ADVISORY:
http://secunia.com/advisories/33034/

CRITICAL:
Less critical

IMPACT:
Privilege escalation

WHERE:
>From local network

SOFTWARE:
Microsoft SQL Server 2000
http://secunia.com/advisories/product/7/

DESCRIPTION:
Bernhard Mueller has discovered a vulnerability in Microsoft SQL
Server 2000, which can be exploited by malicious users to gain
escalated privileges.

The vulnerability is caused due to a boundary error in the
implementation of the "sp_replwritetovarbin()" SQL procedure. This
can be exploited to cause a heap-based buffer overflow via specially
crafted arguments passed to the affected procedure.

Successful exploitation may allow execution of arbitrary code with
escalated privileges.

The vulnerability is confirmed in Microsoft SQL Server 2000 version
8.00.2050 and reported in version 8.00.2039. Other versions may also
be affected.

SOLUTION:
Restrict SQL access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
Bernhard Mueller, SEC Consult

ORIGINAL ADVISORY:
SEC Consult:
http://www.sec-consult.com/files/20081209_mssql-2000-sp_replwritetovarbin_memwrite.txt

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