February 12, 2008
Microsoft Internet Information Services (IIS) is prone to a remote code-execution vulnerability that can be exploited through malicious input to vulnerable ASP pages. A successful exploit of this vulnerability could let remote attackers execute arbitrary code in the context of the Worker Process Identity, which by default has Network Service privileges.
- Microsoft IIS 5.1
- Microsoft IIS 6.0
Block external access at the network boundary, unless external parties require service.
If possible, block external access at the network boundary. Permit access for trusted networks and hosts only.
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 network traffic. This may indicate exploit attempts or activity that results from successful exploits.
Implement multiple redundant layers of security.
Various memory protection schemes (such as nonexecutable and randomly mapped memory segments) may hinder an attacker's ability to exploit this vulnerability to execute arbitrary code.
Microsoft has released a security bulletin to address this vulnerability. Please see the references for details.
This issue was announced by Microsoft.
© 1995- 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 email@example.com.
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 firstname.lastname@example.org 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.