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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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             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:

- --------------------------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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