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  3. Microsoft ISA Server and Forefront Threat Management Gateway Denial of Service Vulnerability

Microsoft ISA Server and Forefront Threat Management Gateway Denial of Service Vulnerability

Risk

Medium

Date Discovered

April 14, 2009

Description

Microsoft ISA Server and Forefront Threat Management Gateway are prone to a remote denial-of-service vulnerability. A remote, anonymous attacker could exploit this issue to cause the Web proxy listener to become unresponsive, denying service legitimate users.

Technologies Affected

  • Microsoft Forefront Threat Management Gateway Medium Business Edition
  • Microsoft ISA Server 2004 SP3
  • Microsoft ISA Server 2006
  • Microsoft ISA Server 2006 SP1
  • Microsoft ISA Server 2006 Supportability Update

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 required. Restricting access to only trusted computers and networks might greatly reduce the likelihood of exploits.

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

Deploy NIDS to monitor network traffic for anomalous or suspicious activity. Monitor logs generated by NIDS and by the server itself for evidence of attacks against the server.
Fixes are available; please see the references for more information.

Credits

Fujitsu-Siemens
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.
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