From: Aaron C. Newman (Application Security, Inc.) <anewman@appsecinc.com>

Sybase Adaptive Server buffer overflow in DROP DATABASE

http://www.appsecinc.com/resources/alerts/sybase/02-0002.html

To determine if you should apply this hot fix, download AppDetective for Sybase from http://www.sybasesecurity.net/products/appdetective/sybase/.

Risk level: High

Threat: Allows a non-privileged login to gain full control of the server

Versions Affected: Sybase Adaptive Server 12.0 and 12.5

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:
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

Thank you,
support@appsecinc.com
Application Security, Inc.
phone: 212-490-6022
fax: 212-490-6456
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