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(The following advisory is also available in PDF format for download at:
http://www.cybsec.com/vuln/CYBSEC-Security_Pre-Advisory_Microsoft_Windows_DHCP_Client_Service_Remote_Buffer_Overflow.pdf )


CYBSEC S.A.
www.cybsec.com

Pre-Advisory Name: Microsoft Windows DHCP Client Service Remote Buffer Overflow
==================

Vulnerability Class: Buffer Overflow
====================

Release Date: 07/11/2006
=============

Affected Platforms:
===================
* Microsoft Windows 2000 (<= SP4)
* Microsoft Windows XP (<= SP2)
* Microsoft Windows 2003 (<= SP1)

Local / Remote: Remote
===============

Severity: High
=========

Author:  Mariano Nuñez Di Croce
=======

Vendor Status:
==============
* Confirmed, update released.

Reference to Vulnerability Disclosure Policy:
=============================================
http://www.cybsec.com/vulnerability_policy.pdf

Vulnerability Description:
==========================
A remote buffer overflow vulnerability has been identified in Microsoft Windows DHCP-Client service.

Technical Details:
==================
Technical details will be released 30 days after publication of this pre-advisory.
This was agreed upon with Microsoft to allow their customers to upgrade affected software prior to technical knowledge been publicly available.

Impact:
=======
Exploiting this vulnerability, an attacker would be able to execute code remotely with SYSTEM privileges over DHCP-enabled Microsoft Windows systems.

Solutions:
==========
Microsoft has released a hotfix to address this vulnerability.
Customers should apply the hotfix immediately or upgrade their systems through Microsoft Windows Update system.


Vendor Response:
================
* 12/26/2005: Initial Vendor Contact.
* 01/19/2006: Vendor Confirmed Vulnerability.
* 07/11/2006: Vendor Releases Update.
* 07/11/2006: Pre-Advisory Public Disclosure.


Contact Information:
====================
For more information regarding the vulnerability feel free to contact
the author at mnunez {at} cybsec.com.

For more information regarding CYBSEC: www.cybsec.com
(c) 2006 - CYBSEC S.A. Security Systems


- --
- ------------------------------
Mariano Nuñez Di Croce

CYBSEC S.A. Security Systems
Email: mnunez@cybsec.com
Tel/Fax: (54-11) 4382-1600
Web: http://www.cybsec.com
PGP: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x26B20899
- ------------------------------

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