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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2007-0147
Information Disclosure Vulnerability in Microsoft Web Proxy Auto-Discovery WPAD

Original Issue Date:December 05, 2007

Severity Rating: MEDIUM

Systems Affected

  • Microsoft Windows 2000 Service Pack 4
  • Windows XP Service Pack 2
  • Windows XP Professional x64 Edition and With Service Pack 2
  • Windows Server 2003 Service Pack 1 and Service Pack 2
  • Windows Server 2003 for Itanium-based Systems with SP 1 and SP2
  • Windows Server 2003 x64 Edition and with Service Pack 2
  • Windows Vista
  • Windows Vista x64 Edition
  • Internet Explorer 5.01 Service Pack 4
  • Internet Explorer 6
  • Internet Explorer 6 for Windows XP Service Pack 2
  • Internet Explorer 6 for Windows Server 2003 Service Pack 1 and Service Pack 2
  • Internet Explorer 6 for Windows Server 2003 for Itanium-based Systems with SP1 and SP2
  • Internet Explorer 6 for Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2
  • Internet Explorer 7 for Windows XP Service Pack 2
  • Internet Explorer 7 for Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2
  • Internet Explorer 7 for Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium-based Systems
  • Internet Explorer 7 for Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2
  • Internet Explorer 7 for Windows Vista
  • Internet Explorer 7 for Windows Vista x64 Edition

Overview

A vulnerability has been reported in Microsoft Web Proxy Auto-Discovery. This vulnerability could be exploited by a remote attacker by hosting a WPAD server to obtain the sensitive information of the sub domains.

Description

The Web Proxy Auto-Discovery WPAD is a method used by web browsers, primarily Internet Explorer, to locate a proxy auto-config file automatically and use this to configure the browsers web proxy settings.

This vulnerability is exists in Microsoft Web Proxy Auto-Discovery WPAD while resolving hostnames that do not include a fully-qualified domain name FQDN .The attacker can host a WAPD server , establishing it as a proxy server to conduct man-in-the-middle attacks against users whose domains are registered as a sub domain to a second-level domain SLD .When visiting this WAPD server would allow remote attacker to obtain sensitive information of the sub domains.



Workaround

  • Create a WPAD.DAT Proxy Auto Configuration File on a Host Named WPAD to Direct Web Browsers to Your Proxy
  • Disable 'Automatically Detect Settings' in Internet Explorer
  • Disable DNS Devolution
  • Configure a Domain Suffix Search List

For details regarding implementation of these workarounds and related impact, refer to Microsoft Security Advisory 945713

Vendor Information

Microsoft
http://www.microsoft.com/technet/security/advisory/945713.mspx

References

SecurityTracker
http://www.securitytracker.com/alerts/2007/Dec/1019033.html

Security Focus
http://www.securityfocus.com/bid/26686/info

CVE Name
CVE-2007-5355

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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