CVE-2009-3677

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Summary

CVECVE-2009-3677
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2009-12-09 18:30:00 UTC
Updated2026-04-23 00:35:47 UTC
DescriptionThe 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."

Risk And Classification

Primary CVSS: v2.0 10 from [email protected]

AV:N/AC:L/Au:N/C:C/I:C/A:C

Problem Types: CWE-94 | CWE-255 | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Microsoft Windows 2000 All sp4 All All
Operating System Microsoft Windows Server 2003 All sp2 All All
Operating System Microsoft Windows Server 2008 All All itanium All
Operating System Microsoft Windows Server 2008 All All x32 All
Operating System Microsoft Windows Server 2008 All All x64 All
Operating System Microsoft Windows Vista All All All All
Operating System Microsoft Windows Vista All All x64 All
Operating System Microsoft Windows Vista All sp1 All All
Operating System Microsoft Windows Xp All sp2 All All
Operating System Microsoft Windows Xp All sp3 All All
Operating System Microsoft Windows Xp - sp2 x64 All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
SecurityTracker.com Archives - Microsoft Internet Authentication Service Bugs Let Remote Authenticated Users Execute Arbitrary Code or Gain Privileges of the Target User af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
Repository / Oval Repository af854a3a-2127-422b-91ae-364da2661108 oval.cisecurity.org
Microsoft Security Bulletin MS09-071 - Critical | Microsoft Docs af854a3a-2127-422b-91ae-364da2661108 docs.microsoft.com
US-CERT Technical Cyber Security Alert TA09-342A -- Microsoft Updates for Multiple Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.us-cert.gov US Government Resource
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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