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  3. Microsoft Windows RPC Mutual Authentication Service Spoofing Vulnerability

Microsoft Windows RPC Mutual Authentication Service Spoofing Vulnerability

Risk

Medium

Date Discovered

June 13, 2006

Description

Microsoft Windows is susceptible to a vulnerability in the RPC component, specifically when using the mutual authentication mechanism with the SSL (Secure Socket Layer) protocol. This issue is due to a flaw in the mutual authentication mechanism that can occur when it attempts to validate the identity of an RPC service. This can allow the attacker to spoof a valid RPC service that victims of the attack may inadvertently access. Exploitation of this issue could potentially expose the victim to other attacks.

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

Recommendations

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

Use network access controls to restrict unauthorized incoming and outgoing network connections. This may prevent clients from connecting to malicious services or limit attacks from hostile services.

Implement multiple authentication mechanisms.

Implement additional mechanisms such as IPSec to secure network traffic.
The vendor has released a security bulletin and fixes to address this issue.

Credits

Discovery is credited to Michael Colson of BindView.
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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