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  3. Microsoft Windows Client Service For Netware Buffer Overflow Vulnerability

Microsoft Windows Client Service For Netware Buffer Overflow Vulnerability

Risk

High

Date Discovered

October 11, 2005

Description

Microsoft Client Service for Netware is prone to a buffer overflow vulnerability that could permit the execution of arbitrary remote code. A remote attacker can exploit this vulnerability to execute arbitrary code and completely compromise the computer. This issue could also be exploited by local attackers to gain elevated privileges. It should be noted that the Client Service for Netware is not installed by default on any affected operating system. Microsoft Windows XP Home is not affected by this vulnerability at all.

Technologies Affected

  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Advanced Server SP1
  • Microsoft Windows 2000 Advanced Server SP2
  • Microsoft Windows 2000 Advanced Server SP3
  • Microsoft Windows 2000 Advanced Server SP4
  • Microsoft Windows 2000 Datacenter Server
  • Microsoft Windows 2000 Datacenter Server SP1
  • Microsoft Windows 2000 Datacenter Server SP2
  • Microsoft Windows 2000 Datacenter Server SP3
  • Microsoft Windows 2000 Datacenter Server SP4
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Professional SP1
  • Microsoft Windows 2000 Professional SP2
  • Microsoft Windows 2000 Professional SP3
  • Microsoft Windows 2000 Professional SP4
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Server Japanese Edition
  • Microsoft Windows 2000 Server SP1
  • Microsoft Windows 2000 Server SP2
  • Microsoft Windows 2000 Server SP3
  • Microsoft Windows 2000 Server SP4
  • Microsoft Windows Server 2003 Datacenter Edition
  • Microsoft Windows Server 2003 Datacenter Edition SP1
  • Microsoft Windows Server 2003 Datacenter Edition SP1 Beta 1
  • Microsoft Windows Server 2003 Enterprise Edition
  • Microsoft Windows Server 2003 Enterprise Edition SP1
  • Microsoft Windows Server 2003 Enterprise Edition SP1 Beta 1
  • Microsoft Windows Server 2003 Standard Edition
  • Microsoft Windows Server 2003 Standard Edition SP1
  • Microsoft Windows Server 2003 Standard Edition SP1 Beta 1
  • Microsoft Windows Server 2003 Web Edition
  • Microsoft Windows Server 2003 Web Edition SP1
  • Microsoft Windows Server 2003 Web Edition SP1 Beta 1
  • Microsoft Windows XP Media Center Edition
  • Microsoft Windows XP Media Center Edition SP1
  • Microsoft Windows XP Media Center Edition SP2
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP1
  • Microsoft Windows XP Professional SP2
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Tablet PC Edition SP1
  • Microsoft Windows XP Tablet PC Edition SP2
  • Nortel Networks Centrex IP Client Manager
  • Nortel Networks Centrex IP Client Manager 2.5.0
  • Nortel Networks Centrex IP Client Manager 7.0.0
  • Nortel Networks Centrex IP Client Manager 8.0.0
  • Nortel Networks Centrex IP Element Manager 2.5.0
  • Nortel Networks Centrex IP Element Manager 7.0.0
  • Nortel Networks Centrex IP Element Manager 8.0.0

Recommendations

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

Access to affected computers should be blocked at the network perimeter. Only allow trusted computers and networks to have access to the resources. This includes blocking unauthorized access to ports 139 and 445.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy network intrusion detection systems to monitor network traffic for signs of unauthorized or anomalous activity. This may aid in detecting exploitation attempts or malicious actions that an attacker may perform after successful exploitation.

Implement multiple redundant layers of security.

Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments may complicate exploitation of memory corruption vulnerabilities.
Microsoft has released updates to address this vulnerability on supported platforms. Nortel Networks has released a technical support bulletin (2005006318) regarding this and other issues for their Centrex IP Client Manager (CICM). They report the vulnerabilities will be fixed in the upcoming 2.5, 7.0 and 8.0 maintenance releases. Please see the referenced bulletin for further information.

Credits

Discovery is credited to Kostya Kortchinsky of CERT RENATER.
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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