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ESB-2005.0626 -- Microsoft Security Bulletin MS05-042 -- Vulnerabilities in Kerberos Could Allow Denial of Service, Information Disclosure, and Spoofing (899587)

Date: 10 August 2005
References: AL-2005.0022  

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Click here for PGP verifiable version
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             AUSCERT External Security Bulletin Redistribution

           ESB-2005.0626 -- Microsoft Security Bulletin MS05-042
        Vulnerabilities in Kerberos Could Allow Denial of Service,
               Information Disclosure, and Spoofing (899587)
                              10 August 2005

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Kerberos
Publisher:         Microsoft
Operating System:  Windows Server 2003
                   Windows XP
                   Windows 2000
Impact:            Access Confidential Data
                   Denial of Service
                   Provide Misleading Information
Access:            Remote/Unauthenticated
CVE Names:         CAN-2005-1982 CAN-2005-1981

Original Bulletin: 
  http://www.microsoft.com/technet/security/Bulletin/MS05-042.mspx

- --------------------------BEGIN INCLUDED TEXT--------------------

MS05-042 - Vulnerabilities in Kerberos Could Allow Denial of Service,
           Information Disclosure, and Spoofing (899587)


  - Affected Software: 
    - Windows 2000 Service Pack 4
    - Windows XP Service Pack 1
    - Windows XP Service Pack 2
    - Windows XP Professional x64 Edition
    - Windows Server 2003
    - Windows Server 2003 Service Pack 1
    - Windows Server 2003 for Itanium-based Systems 
    - Windows Server 2003 with SP1 for Itanium-based Systems 
    - Windows Server 2003 x64 Edition

    - Impact: Remote Code Execution
    - Version Number: 1.0  

Vulnerability Details

	
Kerberos Vulnerability - CAN-2005-1981:

A denial of service vulnerability exists that could allow an attacker to send a
specially crafted message to a Windows domain controller that could cause the
service that is responsible for authenticating users in an Active Directory
domain to stop responding.

	
PKINIT Vulnerability - CAN-2005-1982:

This is an information disclosure and spoofing vulnerability. This 
vulnerability could allow an attacker to tamper with certain information that 
is sent from a domain controller and potentially access sensitive client
network communication.  Users could believe they are accessing a trusted server
when in reality they are accessing a malicious server. However, an attacker
would first have to inject themselves into the middle of an authentication
session between a client and a domain controller.

- --------------------------END INCLUDED TEXT--------------------

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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
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information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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