bugtraq - IBM Tivoli Firewall Security Toolbox buffer overflow vulnerability

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Date: Thu, 20 Mar 2003 18:46:59 +0100
From: Niels Heinen <niels.heinen@...zen.com>
To: bugtraq@...urityfocus.com
Subject: IBM Tivoli Firewall Security Toolbox buffer overflow vulnerability

*******************************************************************

Subject : IBM Tivoli Firewall Security Toolbox (TFST) remote buffer
           overflow vulnerability
Version : Tivoli Firewall Toolbox version 1.2
Platform: All supported platforms

*******************************************************************

0o Overview
-----------

The Tivoli Firewall Toolbox is an optional component of the Tivoli
management environment and provides the underlying communication
for the framework-based applications within a firewall environment.

A vulnerability was discovered in the Tivoli relay daemon, which is
part of this communication layer.

0o Impact
---------

The vulnerability may allow a Tivoli endpoint to execute arbitrary
code on an affected system.

0o Technical description
------------------------

The TFST relay daemon, which listens on a TCP network socket,
performs no bounds checking while storing data from Tivoli nodes
into a memory buffer.  Due to this it is possible for Tivoli nodes
to cause a buffer overflow in the relay daemon.

The buffer overflow can be used to overwrite critical program control
data on the stack and may therefore be used to inject malicious code
in the relay daemon process. This code can then be executed with the
privileges of this process.

On Unix platforms, abuse of this vulnerability can initially allow
remote attackers to penetrate affected systems with user 'nobody'
privileges.  Due to insecure permissions on the relay.sh script,
which is executed at boot time, it is possible to elevate the user
'nobody' privileges to those of the 'root' user on these systems.

It should be noted that the relay daemon, under normal circumstances,
is configured to only accept connections from trusted Tivoli nodes.

0o Solution
-----------

Affected Tivoli customers should upgrade to the IBM Tivoli Firewall
Toolbox version 1.3, which can be found at:

http://www-3.ibm.com/software/sysmgmt/products/support/IBMTivoliManagementFramework.html
(Entitled Customers only)

ftp://ftp.software.ibm.com/software/tivoli_support/patches/patches_1.3
(anonymous access)

0o Disclaimer
-------------

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