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  3. Microsoft ASP.NET Request Scheduling Denial Of Service Vulnerability

Microsoft ASP.NET Request Scheduling Denial Of Service Vulnerability

Risk

Medium

Date Discovered

August 11, 2009

Description

Microsoft ASP.NET is prone to a denial-of-service vulnerability. An attacker can exploit this issue to cause the application pool on the affected webserver to become unresponsive, denying service to legitimate users. NOTE: This issue only affects ASP.NET on webservers running IIS 7 in integrated mode.

Technologies Affected

  • Microsoft .NET Framework 2.0
  • Microsoft .NET Framework 2.0 SP1
  • Microsoft .NET Framework 2.0 SP2
  • Microsoft .NET Framework 3.5
  • Microsoft .NET Framework 3.5 SP1

Recommendations

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

If global access isn't needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of successful exploits.

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 may indicate exploit attempts or activity that results from successful exploits.
The vendor has released an advisory and fixes. Please see the references for details.

Credits

Alexander Pfandt of Digitaria
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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