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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2009-0124
Microsoft Windows CryptoAPI Integer Overflow Spoofing Vulnerabilities

Original Issue Date:October 15, 2009

Severity Rating: HIGH

Systems Affected

  • Microsoft Windows 2000 Service Pack 4
  • Windows XP Service Pack 2 and Windows XP Service Pack 3
  • Windows XP Professional x64 Edition Service Pack 2
  • Windows Server 2003 Service Pack 2
  • Windows Server 2003 x64 Edition Service Pack 2
  • Windows Server 2003 with SP2 for Itanium-based Systems
  • Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
  • Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2
  • Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2
  • Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2
  • Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
  • Windows 7 for 32-bit Systems
  • Windows 7 for x64-based Systems
  • Windows Server 2008 R2 for x64-based Systems
  • Windows Server 2008 R2 for Itanium-based Systems

Overview

Two vulnerabilities have been reported in Microsoft Crypto API that could allow a remote user to spoof certificates of arbitrary sites.

Description

1. X.509 Common Name Null Character Truncation     Vulnerability ( CVE-2009-2510   )

The vulnerability exists because the Windows CryptoAPI incorrectly parsing a null terminator in the Common Name object identifier while processing ASN.1 information from X.509 certificates. This could allow a remote user to create a certificate with a specially crafted Common Name field, resulting in a spoofing attack.

2. X.509 Integer Overflow Spoofing Vulnerability ( CVE-2009-2511   )

This vulnerability is due to the integer overflow error in the Windows CryptoAPI when parsing ASN.1 object identifiers from X.509 certificates. This could allow a remote user to create a certificate with specially crafted ASN.1 values, that would be parsed incorrectly by the Windows CryptoAPI resulting in a spoofing attack.

Solution

Apply appropriate patch as mentioned in Microsoft Security Bulletin MS09-056

Vendor Information

Microsoft
http://www.microsoft.com/technet/security/Bulletin/MS09-056.mspx

References

CISCO
http://tools.cisco.com/security/center/viewAlert.x?alertId=19157
http://tools.cisco.com/security/center/viewAlert.x?alertId=19158

SecurityTracker
http://securitytracker.com/alerts/2009/Oct/1023013.html

VUPEN
http://www.vupen.com/english/advisories/2009/2891

CVE Name
CVE-2009-2510
CVE-2009-2511

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-2436857

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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