Vulnerability Monitor

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CVE-2009-3677

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

2009-12-09T18:30:00.517

Last Modified

2025-04-09T00:30:58.490

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 10.0 (HIGH)

CVSSv2 Vector

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

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

10.0

Impact Score

10.0

Weaknesses
  • Type: Primary
    CWE-94
    CWE-255
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System microsoft windows_2000 * Yes
Operating System microsoft windows_server_2003 * Yes
Operating System microsoft windows_server_2008 * Yes
Operating System microsoft windows_server_2008 * Yes
Operating System microsoft windows_server_2008 * Yes
Operating System microsoft windows_vista * Yes
Operating System microsoft windows_vista * Yes
Operating System microsoft windows_vista * Yes
Operating System microsoft windows_xp * Yes
Operating System microsoft windows_xp * Yes
Operating System microsoft windows_xp - Yes
References