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  3. Microsoft Windows Server Service Remote Buffer Overflow Vulnerability

Microsoft Windows Server Service Remote Buffer Overflow Vulnerability

Risk

High

Date Discovered

August 8, 2006

Description

Microsoft Windows Server Service is prone to a remote buffer-overflow vulnerability. This vulnerability arises when the service processes a malicious message in RPC communications. A successful attack may result in arbitrary code execution with SYSTEM privileges leading to a full compromise. Attack attempts may result in denial-of-service conditions as well. Microsoft has reported that this issue is being exploited in the wild. Update (August 14, 2006): A worm named 'W32.Wargbot' that exploits this issue to spread is currently in the wild.

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 SP1
  • Microsoft Windows 2000 Server SP2
  • Microsoft Windows 2000 Server SP3
  • Microsoft Windows 2000 Server SP4
  • Microsoft Windows NT 4.0
  • Microsoft Windows NT 4.0 SP1
  • Microsoft Windows NT 4.0 SP2
  • Microsoft Windows NT 4.0 SP3
  • Microsoft Windows NT 4.0 SP4
  • Microsoft Windows NT 4.0 SP5
  • Microsoft Windows NT 4.0 SP6
  • Microsoft Windows NT 4.0 SP6a
  • Microsoft Windows NT Enterprise Server 4.0
  • Microsoft Windows NT Enterprise Server 4.0 SP1
  • Microsoft Windows NT Enterprise Server 4.0 SP2
  • Microsoft Windows NT Enterprise Server 4.0 SP3
  • Microsoft Windows NT Enterprise Server 4.0 SP4
  • Microsoft Windows NT Enterprise Server 4.0 SP5
  • Microsoft Windows NT Enterprise Server 4.0 SP6
  • Microsoft Windows NT Enterprise Server 4.0 SP6a
  • Microsoft Windows NT Server 4.0
  • Microsoft Windows NT Server 4.0 SP1
  • Microsoft Windows NT Server 4.0 SP2
  • Microsoft Windows NT Server 4.0 SP3
  • Microsoft Windows NT Server 4.0 SP4
  • Microsoft Windows NT Server 4.0 SP5
  • Microsoft Windows NT Server 4.0 SP6
  • Microsoft Windows NT Server 4.0 SP6a
  • Microsoft Windows NT Terminal Server 4.0
  • Microsoft Windows NT Terminal Server 4.0 SP1
  • Microsoft Windows NT Terminal Server 4.0 SP2
  • Microsoft Windows NT Terminal Server 4.0 SP3
  • Microsoft Windows NT Terminal Server 4.0 SP4
  • Microsoft Windows NT Terminal Server 4.0 SP5
  • Microsoft Windows NT Terminal Server 4.0 SP6
  • Microsoft Windows NT Terminal Server 4.0 SP6a
  • Microsoft Windows NT Workstation 4.0
  • Microsoft Windows NT Workstation 4.0 SP1
  • Microsoft Windows NT Workstation 4.0 SP2
  • Microsoft Windows NT Workstation 4.0 SP3
  • Microsoft Windows NT Workstation 4.0 SP4
  • Microsoft Windows NT Workstation 4.0 SP5
  • Microsoft Windows NT Workstation 4.0 SP6
  • Microsoft Windows NT Workstation 4.0 SP6a
  • 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 Home
  • Microsoft Windows XP Home SP1
  • Microsoft Windows XP Home SP2
  • 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 Professional x64 Edition
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Tablet PC Edition SP1
  • Microsoft Windows XP Tablet PC Edition SP2

Recommendations

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

Filter access to the affected computer at the network boundary if global access isn't needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploitation. Block TCP ports 139 and 445 because they are used to initiate a connection to the affected component.

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

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This includes but is not limited to requests that include NOP sleds and unexplained incoming and outgoing traffic. This may indicate exploitation attempts or activity that results from successful exploitation.

Implement multiple redundant layers of security.

Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as non-executable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploitation of memory-corruption vulnerabilities.
Microsoft has released an advisory including fixes to address this issue. A Cisco advisory containing various mitigation strategies using Cisco products to prevent attacks is available. Please see the references for more information.

Credits

US-CERT and SANS are credited with providing information about this issue. The individual responsible for discovering this issue is currently unknown.
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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