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Microsoft Windows Web Client Service Remote Code Execution Vulnerability

Risk

High

Date Discovered

June 14, 2005

Description

Microsoft Windows Web Client Service is affected by a remote code execution vulnerability. This is due to a buffer overflow in the affected component. A remote authenticated attacker can exploit this issue by sending a malformed message to the Web Client Service. This can lead to arbitrary code execution resulting in privilege escalation. An attacker may also exploit this issue through another application that passes data to the vulnerable component. Web Client Service is disabled on Windows Server 2003 by default.

Technologies Affected

  • Microsoft Windows Server 2003 Datacenter Edition
  • Microsoft Windows Server 2003 Datacenter Edition Itanium
  • Microsoft Windows Server 2003 Datacenter Edition Itanium SP1
  • Microsoft Windows Server 2003 Datacenter Edition SP1
  • Microsoft Windows Server 2003 Datacenter x64 Edition
  • Microsoft Windows Server 2003 Enterprise Edition
  • Microsoft Windows Server 2003 Enterprise Edition Itanium
  • Microsoft Windows Server 2003 Enterprise Edition Itanium SP1
  • Microsoft Windows Server 2003 Enterprise Edition SP1
  • Microsoft Windows Server 2003 Enterprise x64 Edition
  • Microsoft Windows Server 2003 Standard Edition
  • Microsoft Windows Server 2003 Standard Edition SP1
  • Microsoft Windows Server 2003 Standard x64 Edition
  • Microsoft Windows Server 2003 Web Edition
  • Microsoft Windows Server 2003 Web Edition SP1
  • Microsoft Windows XP 64-bit Edition
  • Microsoft Windows XP 64-bit Edition SP1
  • Microsoft Windows XP 64-bit Edition Version 2003
  • Microsoft Windows XP Home
  • Microsoft Windows XP Home SP1
  • Microsoft Windows XP Media Center Edition
  • Microsoft Windows XP Media Center Edition SP1
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP1
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Tablet PC Edition SP1

Recommendations

Permit local access for trusted individuals only. Where possible, use restricted environments and restricted shells.

Due to the local nature of this vulnerability, it is strongly recommended that local interactive access should be provided for trusted individuals only.

Block external access at the network boundary, unless external parties require service.

Access to the vulnerable computer should be blocked at the network perimeter. Only allow trusted computers and networks to have access to the resources. WebDAV uses TCP port 80 for outbound communication, however, TCP ports 139 and 445 are used for inbound connections. Blocking TCP ports 139 and 445 can block exploitation attempts.

Permit privileged access for trusted individuals only.

Access to the affected computer and services should be provided to trusted individuals only.

Implement multiple redundant layers of security.

Memory protection schemes such as non-executable stack and heap configurations and randomly mapped memory segments will complicate exploitation of memory corruption vulnerabilities.
Microsoft has released updates to address this vulnerability on supported platforms.

Credits

Discovery is credited to Mark Litchfield.
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

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