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AUSCERT External Security Bulletin Redistribution
ESB-2014.2167
Vulnerability in Kerberos Could Allow Elevation of Privilege (3011780)
19 November 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Windows Kerberos KDC
Publisher: Microsoft
Operating System: Windows
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-6324
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS14-068
Comment: When this security bulletin was issued, Microsoft
was aware of limited, targeted attacks that attempt to exploit this
vulnerability.
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Microsoft Security Bulletin MS14-068 - Critical Vulnerability in Kerberos
Could Allow Elevation of Privilege (3011780)
Published: November 18, 2014
Version: 1.0
Executive Summary
This security update resolves a privately reported vulnerability in Microsoft
Windows Kerberos KDC that could allow an attacker to elevate unprivileged
domain user account privileges to those of the domain administrator account.
An attacker could use these elevated privileges to compromise any computer in
the domain, including domain controllers. An attacker must have valid domain
credentials to exploit this vulnerability. The affected component is available
remotely to users who have standard user accounts with domain credentials;
this is not the case for users with local account credentials only. When this
security bulletin was issued, Microsoft was aware of limited, targeted attacks
that attempt to exploit this vulnerability.
This security update is rated Critical for all supported editions of Windows
Server 2003, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012,
and Windows Server 2012 R2. The update is also being provided on a
defense-in-depth basis for all supported editions of Windows Vista, Windows 7,
Windows 8, and Windows 8.1. For more information, see the Affected Software
section.
The security update addresses the vulnerability by correcting signature
verification behavior in Windows implementations of Kerberos.
Affected Software
Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8 and Windows 8.1
Windows Server 2012 and Windows Server 2012 R2
Vulnerability Information
Kerberos Checksum Vulnerability - CVE-2014-6324
A remote elevation of privilege vulnerability exists in implementations of
Kerberos KDC in Microsoft Windows. The vulnerability exists when the Microsoft
Kerberos KDC implementations fail to properly validate signatures, which can
allow for certain aspects of a Kerberos service ticket to be forged. Microsoft
received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft
was aware of limited, targeted attacks that attempt to exploit this
vulnerability. Note that the known attacks did not affect systems running
Windows Server 2012 or Windows Server 2012 R2. The update addresses the
vulnerability by correcting signature verification behavior in Windows
implementations of Kerberos.
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