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

                       AL-2009.0029 -- AUSCERT ALERT
                                   [Win]
               Windows HTTP Services: Execute Arbitrary Code
                               15 April 2009

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

Product:              Windows 2000 Service Pack 4
                      Windows XP Service Pack 2
                      Windows XP Service Pack 3
                      Windows XP Professional x64 Edition
                      Windows XP Professional x64 Edition Service Pack 2
                      Windows Server 2003 Service Pack 1
                      Windows Server 2003 Service Pack 2
                      Windows Server 2003 x64 Edition
                      Windows Server 2003 x64 Edition Service Pack 2
                      Windows Server 2003 with SP1 for Itanium-based 
                        Systems
                      Windows Server 2003 with SP2 for Itanium-based 
                        Systems
                      Windows Vista and Windows Vista Service Pack 1
                      Windows Vista x64 Edition
                      Windows Server 2008 for 32-bit Systems
                      Windows Server 2008 for x64-based Systems
                      Windows Server 2008 for Itanium-based Systems
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
                      Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0550 CVE-2009-0089 CVE-2009-0086

Original Bulletin:   
  http://www.microsoft.com/technet/security/bulletin/MS09-013.mspx

Comment: An exploit for the remote code execution vulnerability described 
         in CVE-2009-0086 has been made public.

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Microsoft Security Bulletin MS09-013 - Critical

Vulnerabilities in Windows HTTP Services Could Allow Remote Code Execution 
(960803)

   Published: April 14, 2009

   Version: 1.0

General Information

Executive Summary

   This security update resolves one publicly disclosed vulnerability and 
   two privately reported vulnerabilities in Microsoft Windows HTTP Services 
   (WinHTTP). The most severe vulnerability could allow remote code 
   execution. An attacker who successfully exploited this vulnerability 
   could take complete control of an affected system. An attacker could then 
   install programs; view, change, or delete data; or create new accounts 
   with full user rights. Users whose accounts are configured to have fewer 
   user rights on the system could be less impacted than users who operate 
   with administrative user rights.

   This security update is rated Critical for all supported editions of 
   Microsoft Windows 2000, Windows XP, Windows Server 2003, Windows Vista, 
   and Windows Server 2008. For more information, see the subsection, 
   Affected and Non-Affected Software, in this section.

   The security update addresses the vulnerabilities by changing the way 
   that Windows HTTP Services handles errors and validates certificates, and 
   by ensuring that Windows HTTP Services correctly use NTLM credential 
   reflection protection mechanisms. For more information about the 
   vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for 
   the specific vulnerability entry under the next section, Vulnerability 
   Information.

Affected Software
 
   Microsoft Windows 2000 Service Pack 4
   Windows XP Service Pack 2 and Windows XP Service Pack 3
   Windows XP Professional x64 Edition and Windows XP Professional x64 
     Edition Service Pack 2
   Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2
   Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition 
     Service Pack 2
   Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 
     2003 with SP2 for Itanium-based Systems
   Windows Vista and Windows Vista Service Pack 1
   Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1
   Windows Server 2008 for 32-bit Systems*
   Windows Server 2008 for x64-based Systems*
   Windows Server 2008 for Itanium-based Systems

   *Windows Server 2008 server core installation affected.

Vulnerability Information

Windows HTTP Services Integer Underflow Vulnerability - CVE-2009-0086

A remote code execution vulnerability exists in the way that Windows HTTP 
Services handle specific values that are returned by a remote Web server. 
An attacker who successfully exploited this vulnerability could take 
complete control of an affected system. An attacker could then install 
programs; view, change, or delete data; or create new accounts with the 
same user rights as the service or application which calls the WinHTTP API 
to connect to the attacker's Web server.

Windows HTTP Services Certificate Name Mismatch Vulnerability - 
CVE-2009-0089

A spoofing vulnerability exists in Windows HTTP Services as a result of the 
incomplete validation of the distinguished name in a digital certificate. 
When combined with specific other attacks, such as DNS spoofing, this may 
allow an attacker to successfully spoof the digital certificate of a Web 
site for any application that uses Windows HTTP Services.

Windows HTTP Services Credential Reflection Vulnerability - CVE-2009-0550

A remote code execution vulnerability exists in the way that Windows HTTP 
Services handles NTLM credentials when a user connects to an attacker's Web 
server. This vulnerability allows an attacker to replay the user's 
credentials back to the attacker and execute code in the context of the 
logged-on user. If a user is logged on with administrative user rights, an 
attacker who successfully exploited this vulnerability could take complete 
control of an affected system. An attacker could then install programs; 
view, change, or delete data; or create new accounts with full user rights. 
Users whose accounts are configured to have fewer user rights on the system 
could be less impacted than users who operate with administrative user rights.

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The University of Queensland
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