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Microsoft Windows DHCP Server Remote Buffer Overflow Vulnerability

Risk

High

Date Discovered

December 14, 2004

Description

Microsoft Windows DHCP server on NT 4 server platforms is reported susceptible to a remote buffer overflow vulnerability. This issue is due to insufficient bounds checking of user-supplied network data. This vulnerability allows remote attackers to execute arbitrary code in the context of the affected service. The DHCP server is running with administrative privileges, allowing remote attackers to gain administrative access, or to crash the affected service, denying service to legitimate users. This may allow attackers to interrupt network services to an entire network. It is noted that the service is not installed by default.

Technologies Affected

  • Microsoft Windows NT 4.0
  • Microsoft Windows NT 4.0 SP1
  • Microsoft Windows NT 4.0 SP1 alpha
  • Microsoft Windows NT 4.0 SP2
  • Microsoft Windows NT 4.0 SP2 alpha
  • Microsoft Windows NT 4.0 SP3
  • Microsoft Windows NT 4.0 SP3 alpha
  • Microsoft Windows NT 4.0 SP4
  • Microsoft Windows NT 4.0 SP4 alpha
  • Microsoft Windows NT 4.0 SP5
  • Microsoft Windows NT 4.0 SP5 alpha
  • Microsoft Windows NT 4.0 SP6
  • Microsoft Windows NT 4.0 SP6 alpha
  • Microsoft Windows NT 4.0 SP6a
  • Microsoft Windows NT 4.0 SP6a alpha
  • Microsoft Windows NT 4.0 alpha
  • 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 Terminal Server 4.0 alpha
  • 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

Recommendations

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

Access to the affected service should be filtered at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploitation. This includes blocking UDP ports 67 and 68 at the perimeter.

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

Deploy network intrusion detection software to monitor network activity. Network traffic should be monitored for malformed DHCP packets.
Microsoft has released updates to address this vulnerability in supported versions of the Windows operating system.

Credits

Kostya Kortchinsky is credited for the disclosure of this vulnerability.
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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