Date Discovered January 10, 2006
Description Microsoft Windows is susceptible to a remotely exploitable buffer-overflow vulnerability. This issue is due to the software's failure to properly bounds-check user-supplied input before copying it to an insufficiently sized memory buffer.
This issue allows remote attackers to execute arbitrary machine code in the context of the vulnerable software on the targeted user's computer.
Do not accept communications that originate from unknown or untrusted sources. Do not follow links or open email from unknown or untrusted sources.
Implement multiple redundant layers of security. An attacker's ability to exploit this vulnerability to execute arbitrary code may be hindered through the use of various memory-protection schemes. Where possible, use non-executable and randomly mapped memory segments.
Modify default configuration files to disable any unwanted behavior. Since exploitation requires users to view HTML content, consider disabling HTML rendering in email clients to mitigate the possibility of remote exploitation. Note that disabling HTML content in email clients may reduce their functionality.
Run all software as a nonprivileged user with minimal access rights.
Always run non-administrative software as a non-administrative user with the minimal amount of privileges required to successfully operate. This will limit the potential damage that successful exploitation may achieve.
Avaya security advisory ASA-2006-004 addresses this issue. Avaya recommends following Microsoft's instructions for installing the Operating System patch.
Nortel has released an advisory (2006006582) to identify vulnerable products. The vendor advises customers to follow Microsoft's recommendations and install fixes supplied by Microsoft.
Fixes are available:
Credits Fang Xing is credited with the discovery of this issue.
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 firstname.lastname@example.org
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 email@example.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.