National Cyber Awareness System

Vulnerability Summary for CVE-2009-3677

Overview

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."

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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US-CERT Technical Alert: TA09-342A

Name: TA09-342A

Hyperlink:http://www.us-cert.gov/cas/techalerts/TA09-342A.html

External Source: SECTRACK

Name: 1023291

Hyperlink:http://www.securitytracker.com/id?1023291

External Source: MS

Name: MS09-071

Hyperlink:http://www.microsoft.com/technet/security/Bulletin/MS09-071.mspx

External Source: OVAL

Name: oval:org.mitre.oval:def:6209

Hyperlink:http://oval.mitre.org/repository/data/getDef?id=oval:org.mitre.oval:def:6209

References to Check Content

Identifier:oval:org.mitre.oval:def:6209

Check System:http://oval.mitre.org/XMLSchema/oval-definitions-5

Hyperlink:http://oval.mitre.org/repository/data/DownloadDefinition?id=oval:org.mitre.oval:def:6209