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

                       AL-2009.0045 -- AUSCERT ALERT
                                   [Win]
                 Active Directory: Execute Arbitrary Code
                               10 June 2009

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

Product:              Active Directory
                      Active Directory Application Mode (ADAM)
Publisher:            Microsoft
Operating System:     Windows Server 2003
                      Windows Server 2000
                      Windows XP
Impact:               Execute Arbitrary Code/Commands
                      Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-1139 CVE-2009-1138

Original Bulletin:    
  http://www.microsoft.com/technet/security/bulletin/ms09-018.mspx

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Microsoft Security Bulletin MS09-018 - Critical

Vulnerabilities in Active Directory Could Allow Remote Code Execution 
(971055)

   Published: June 9, 2009

   Version: 1.0

General Information

Executive Summary

   This security update resolves two privately reported vulnerabilities in 
   implementations of Active Directory on Microsoft Windows 2000 Server 
   and Windows Server 2003, and Active Directory Application Mode (ADAM) 
   when installed on Windows XP Professional and Windows Server 2003. The 
   more severe vulnerability could allow remote code execution. An attacker 
   who successfully exploited this vulnerability could take complete 
   control of an affected system remotely. An attacker could then install 
   programs; view, change, or delete data; or create new accounts with full 
   user rights. Firewall best practices and standard default firewall 
   configurations can help protect networks from attacks that originate 
   outside the enterprise perimeter. Best practices recommend that systems 
   that are connected to the Internet have a minimal number of ports exposed.

   This security update is rated Critical for all supported editions of 
   Microsoft Windows 2000 Server, and rated Important for supported versions 
   of Windows XP Professional and Windows Server 2003. For more information, 
   see the subsection, Affected and Non-Affected Software, in this section.

   The security update addresses the vulnerability by correcting the way 
   that the LDAP service allocates and frees memory while processing 
   specially crafted LDAP or LDAPS requests.

   Recommendation. The majority of customers have automatic updating 
   enabled and will not need to take any action because this security 
   update will be downloaded and installed automatically. Customers who 
   have not enabled automatic updating need to check for updates and 
   install this update manually.

Affected Software

   Active Directory on
   Microsoft Windows 2000 Server Service Pack 4 
   Active Directory Application Mode (ADAM) on
   Windows XP Professional Service Pack 2 and 
   Windows XP Professional Service Pack 3
   Active Directory Application Mode (ADAM) on
   Windows XP Professional x64 Edition Service Pack 2
   Active Directory on Windows Server 2003 Service Pack 2
   Active Directory Application Mode (ADAM) on
   Windows Server 2003 Service Pack 2
   Active Directory on 
   Windows Server 2003 x64 Edition Service Pack 2
   Active Directory Application Mode (ADAM) on
   Windows Server 2003 x64 Edition Service Pack 2
   Active Directory on
   Windows Server 2003 with SP2 for Itanium-based Systems

Vulnerability Information

   Active Directory Invalid Free Vulnerability - CVE-2009-1138

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

   Active Directory Memory Leak Vulnerability - CVE-2009-1139

   A denial of service vulnerability exists in implementations of Active 
   Directory on Microsoft Windows 2000 Server and Windows Server 2003. The 
   vulnerability also exists in implementations of Active Directory 
   Application Mode (ADAM) when installed on Windows XP Professional and 
   Windows Server 2003. The vulnerability is due to improper memory 
   management during execution of certain types of LDAP or LDAPS requests. 
   An attacker who successfully exploited this vulnerability could cause 
   the affected server to stop responding.

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

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