Rule

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Sid
3-16329

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Summary:
This event is generated when an attempt is made to exploit a known vulnerability in IAS.

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Impact:
Denial of Service. Information disclosure. Loss of integrity. Complete admin access.

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Detailed Information:
The Internet Authentication Service (IAS) in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold and SP1, and Server 2008 Gold does not properly verify the credentials in an MS-CHAP v2 Protected Extensible Authentication Protocol (PEAP) authentication request, which allows remote attackers to access network resources via a malformed request, aka "MS-CHAP Authentication Bypass Vulnerability."

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Affected Systems:
Microsoft Windows 2000 SP4
Microsoft Windows XP SP2 and SP3
Microsoft Windows Server 2003 SP2
Microsoft Windows Vista Gold and SP1
Microsoft Windows Server 2008 Gold

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Attack Scenarios:
If an application does not correctly enforce access control, a remote attacker may be able to view resources and data that should be protected. Additionally, in the case of administrative user interfaces, the attacker may be able to elevate privileges and generate accounts by accessing functions that should be controllled by ACLs.

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Ease of Attack:
Difficult.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Upgrade to the latest non-affected version of the software.

Apply the appropriate vendor supplied patches.

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Contributors:
Sourcefire Vulnerability Research Team
This document was generated from data supplied by the National Vulnerability Database. A product of the National Institute of Standards and Technology.
For more information see http://nvd.nist.gov/

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Additional References:

NIST CVE-2009-3677:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3677
 
Common Weakness Enumeration:
http://cwe.mitre.org/data/definitions/285.html
 
Common Attack Pattern Enumeration and Classification:
http://capec.mitre.org/data/definitions/1.html

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