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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2008.0105 -- AUSCERT ALERT
                                   [Win]
          MS08-060 - Critical - Vulnerability in Active Directory
                     Could Allow Remote Code Execution
                              15 October 2008

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        AusCERT Alert Summary
        ---------------------

Product:              Active Directory
Publisher:            Microsoft
Operating System:     Windows 2000 Server
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-4023

Original Bulletin:  
  http://www.microsoft.com/technet/security/bulletin/ms08-060.mspx

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Microsoft Security Bulletin MS08-060 - Critical

Vulnerability in Active Directory Could Allow Remote Code Execution (957280)

   Published: October 14, 2008

   Version: 1.0

General Information

Executive Summary

   This security update resolves a privately reported vulnerability in
   implementations of Active Directory on Microsoft Windows 2000 Server.
   The vulnerability could allow remote code execution if an attacker
   gains access to an affected network. This vulnerability only affects
   Microsoft Windows 2000 servers configured to be domain controllers. If
   a Microsoft Windows 2000 server has not been promoted to a domain
   controller, it will not be listening to Lightweight Directory Access
   Protocol (LDAP) or LDAP over SSL (LDAPS) queries, and will not be
   exposed to this vulnerability.

   This security update is rated Critical for implementations of Active
   Directory on Microsoft Windows 2000 Server. For more information, see
   the subsection, Affected and Non-Affected Software, in this section.

   The security update addresses the vulnerability by correctly
   allocating memory for client LDAP requests. 

   Recommendation. Microsoft recommends that customers apply the update
   immediately.

Affected Software

   Microsoft Windows 2000 Server Service Pack 4 - Active Directory

Vulnerability Information

Active Directory Overflow Vulnerability - CVE-2008-4023

   A remote code execution vulnerability exists in implementations of
   Active Directory on Microsoft Windows 2000 Server. The vulnerability
   is due to incorrect memory allocation when receiving specially crafted
   LDAP or LDAPS requests. An attacker who successfully exploited this
   vulnerability could take complete control of an affected system.

Workarounds for Active Directory Overflow Vulnerability - CVE-2008-4023

   Block TCP ports 389 and 636 at the perimeter firewall

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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