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Microsoft Windows cmd line tools BOFs
From: Martin Eiszner <m.eiszner () sec-consult com>
Date: Wed, 17 Nov 2004 09:02:36 +0100


========================================
Microsoft commandline tools BOF s
========================================

Product:        Windows-2000 SP4 / Windows-XP SP2

Vulnerablities:

- Buffer Overflow (no privilege escalation)

Vendor:         Microsoft (http://www.microsoft.com/)
Vendor-Status:  vendor contacted (between 2002 and 2003)
Vendor-Patches: ipconfig (XP-SP 2) / forcedos.exe and mrinfo.exe not available

Objects:        ipconfig.exe / forcedos.exe / mrinfo.exe

Exploitable:
Local:          PARTIAL
Remote:         NO

============
Introduction
============

---

=====================
Vulnerability Details
=====================

1) LOCAL BUFFER OVERFLOWS / FORMAT STRING VULNERABILITY
=======================================================

OBJECTS:
ipconfig.exe (only Windows-2000 SP4)
forcedos.exe
mrinfo.exe

DESCRIPTION:
Insufficient input-validation leads to a) stack based bufferoverflows and b) format string- vulnerabilites.

EXAMPLES:

a) ipconfig.exe /`perl -e 'print "PAAAA\x44\x33\x22\x11","%08x"x13,"%n";'`
b) forcedos.exe `perl -e 'print "A"x6784;'`
c) mrinfo.exe -i `perl -e 'print "A"x60;'`

===============
GENERAL REMARKS
===============

Find related postings regarding this issue here: 
(http://www.derkeiler.com/Mailing-Lists/Full-Disclosure/2004-10/0065.html).

It is unlikely you to gain access or elevate priviledges thru "forcedos.exe" and "mrinfo.exe".

Nevertheless it might be possible to misuse "ipconfig.exe" in an "restricted" environment with DHCP enabled !!


====================
Recommended Hotfixes
====================

---

EOF @2003 Brereton_paul () btinternet com,m.eiszner () sec-consult com


=======
Contact
=======

SEC-CONSULT
UK / EUROPE
Austria / EUROPE

Brereton_paul () btinternet com
m.eiszner () sec-consult com


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