MS-CHAP Authentication Bypass Vulnerability

Publish date: February 15, 2011
  Severity: CRITICAL
  CVE Identifier: CVE-2009-3677
  Advisory Date: FEB 15, 2011

  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."

  TREND MICRO PROTECTION INFORMATION

Trend Micro Deep Security shields networks through Deep Packet Inspection (DPI) rules. Trend Micro customers using OfficeScan with Intrusion Defense Firewall (IDF) plugin are also protected from attacks using these vulnerabilities. Please refer to the filter number and filter name when applying appropriate DPI and/or IDF rules.

  SOLUTION

  Trend Micro Deep Security DPI Rule Number: 1003871
  Trend Micro Deep Security DPI Rule Name: 1003871 - MS-CHAP Authentication Bypass Vulnerability

  AFFECTED SOFTWARE AND VERSION

  • microsoft windows_2000
  • microsoft windows_server_2003
  • microsoft windows_server_2008
  • microsoft windows_vista
  • microsoft windows_xp
  • microsoft windows_xp -

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