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HIGH

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."

Published Dec 9, 2009

Description

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."

Affected products

Remediation

No remediation recorded yet.

References (5)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Dec 9, 2009
Updated Aug 7, 2024
Reserved Oct 13, 2009
NVD
Status Modified
Modified Jun 16, 2026
Red Hat
Severity n/a
Public date n/a
ENISA EUVD
Assigner microsoft
Published Dec 9, 2009
Updated Aug 7, 2024
Exploited since n/a
EUVD-2009-3652