April 10, 2012
Microsoft Office is prone to a remote heap-based buffer-overflow vulnerability because the software fails to perform adequate boundary-checks on user-supplied data. An attacker can exploit this issue by enticing an unsuspecting user into opening a specially crafted '.wps' file. Successfully exploiting this issue allows attackers to execute arbitrary code in the context of the currently logged-in user. Failed exploit attempts may result in a denial-of-service condition.
- Microsoft Office 2007
- Microsoft Office 2007 SP1
- Microsoft Office 2007 SP2
- Microsoft Works 6-9 File Converter
- Microsoft Works 9.0
Run all software as a nonprivileged user with minimal access rights.
To mitigate the impact of a successful exploit, run the affected application as a user with minimal access rights.
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 traffic. This may indicate exploitation attempts or activity that results from successful exploitation.
Do not accept or execute files from untrusted or unknown sources.
Never accept files from untrusted or unknown sources, because they may be malicious in nature. Avoid opening email attachments from unknown or questionable sources.
Do not accept communications that originate from unknown or untrusted sources.
Do not accept or preview emails that come from unknown or unsolicited locations.
Implement multiple redundant layers of security.
Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploit attempts of memory-corruption vulnerabilities.
Updates are available. Please see the references for more information.
Shaun Colley of IOActive, Ltd.
© 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 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.