Date Discovered July 11, 2006
Description Microsoft Excel is prone to a remote code-execution vulnerability because it fails to handle exceptional conditions.
Successfully exploiting this issue allows attackers to corrupt process memory and to execute arbitrary code in the context of targeted users.
Note that Microsoft Office applications include functionality to embed Office files as objects contained in other Office files. As an example, Microsoft Word files may contain embedded malicious Microsoft Excel files, making Word documents another possible attack vector.
- Microsoft Excel 2000
- Microsoft Excel 2000 SP2
- Microsoft Excel 2000 SP3
- Microsoft Excel 2000 SR1
- Microsoft Excel 2002
- Microsoft Excel 2002 SP1
- Microsoft Excel 2002 SP2
- Microsoft Excel 2002 SP3
- Microsoft Excel 2003
- Microsoft Excel 2003 SP1
- Microsoft Excel 2003 SP2
- Microsoft Excel 2004 for Mac
- Microsoft Excel Viewer 2003
- Microsoft Excel x for Mac
Run all software as a nonprivileged user with minimal access rights. Perform all nonadministrative tasks as an unprivileged 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 suspicious or anomalous activity. This may help detect malicious actions that an attacker may take after successfully exploiting vulnerabilities in applications. Review all applicable logs regularly.
Do not accept or execute files from untrusted or unknown sources. Users should 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 follow links provided by unknown or untrusted sources. Users should avoid websites of questionable integrity. Never follow links supplied by unknown or untrusted sources.
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 exploits of memory-corruption vulnerabilities.
Microsoft has released a security advisory addressing this issue.
Credits Warning3 working with NSFOCUS reported this vulnerability.
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.