[NT] Another SQL Server 7 Buffer Overflow (xp_dirtree)From: email@example.com
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From: email@example.com To: firstname.lastname@example.org Date: Sun, 10 Mar 2002 01:11:49 +0100 (CET)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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Another SQL Server 7 Buffer Overflow (xp_dirtree)
The extended stored procedure xp_dirtree allows all users to retrieve the
subdirectory structure of a given drive or folder. A security
vulnerability in this stored procedure allows attackers to overflow an
internal buffer used by the function and execute arbitrary code.
* Microsoft SQL Server 7 all service packs and fixes, version 7.00.1021
The buffer overflow occurs when a long string is supplied:
In this form it is hard to exploit due to a string conversion. However, if
you pass the parameter as Unicode:
Then there is no string conversion, and you can crash the server and
exploit the buffer overflow. Unicode buffer overflows are a bit harder to
exploit but not impossible.
Drop the extended store procedure and its DLL.
Microsoft was not contacted.
The information has been provided by <mailto:email@example.com> c c.
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