[NT] Sybase DROP DATABASE Buffer Overflow

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From: support@securiteam.com
To: list@securiteam.com
Date: 28 Nov 2002 18:04:45 +0200

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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  Sybase DROP DATABASE Buffer Overflow
------------------------------------------------------------------------

SUMMARY

The built-in function DROP DATABASE contains a buffer overflow that may
allow an attacker to overwrite the stack and execute arbitrary code under
the security context of the server. Any valid login in Sybase is able to
execute this function.

DETAILS

Vulnerable systems:
 * Sybase Adaptive Server version 12.0 and 12.5

Sybase Adaptive Server provides a built-in function called DROP DATABASE.
This function is used to remove a database from the server.

DROP DATABASE accepts a single parameter that is the name of the database
to remove. DROP DATABASE does not validate the length of the string passed
into the first parameter. This buffer overflow may allow an attacker to
run arbitrary code under the security context of the database.

Below is an example of overflowing the buffer using the SQL tool isql.exe.

1> declare @test varchar(16384)
2> select @test = replicate('A', 16384)
3> DROP DATABASE @test
4> go

Fix:
You should apply the following patches:
 * 12.5.0.2 - 11/14/2002
 * 12.0.0.6 ESD#1 - 11/5/2002

These patches can be downloaded from
<http://downloads.sybase.com/swd/swx> http://downloads.sybase.com/swd/swx

ADDITIONAL INFORMATION

The original advisory can be found at:
 <http://www.appsecinc.com/resources/alerts/sybase/02-0002.html>
http://www.appsecinc.com/resources/alerts/sybase/02-0002.html

The information has been provided by <mailto:anewman@appsecinc.com> Aaron
C. Newman (Application Security, Inc.).

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