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  3. Microsoft Office Malformed String Remote Code Execution Vulnerability

Microsoft Office Malformed String Remote Code Execution Vulnerability

Risk

High

Date Discovered

February 3, 2007

Description

Microsoft Office is prone to a remote code-execution vulnerability. This issue occurs when the application processes maliciously crafted files. This issue is currently being exploited via Excel files (.xls), but other Office applications may also be vulnerable. An attacker could exploit this issue by enticing a victim into opening a malicious Office file. If the vulnerability is successfully exploited, this could result in the execution of arbitrary code in the context of the currently logged-in user.

Technologies Affected

  • Microsoft Excel
  • 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 2003 SP3
  • Microsoft Excel 2004 for Mac
  • Microsoft Office 2000
  • Microsoft Office 2000 SP1
  • Microsoft Office 2000 SP2
  • Microsoft Office 2000 SP3
  • Microsoft Office 2003
  • Microsoft Office 2003 SP1
  • Microsoft Office 2003 SP2
  • Microsoft Office 2004 for Mac
  • Microsoft Office XP
  • Microsoft Office XP SP1
  • Microsoft Office XP SP2
  • Microsoft Office XP SP3
  • Microsoft Project 2000 SR1
  • Microsoft Project 2002 SP1
  • Microsoft Visio 2002 Professional SP2
  • Microsoft Visio 2002 SP2
  • Microsoft Visio 2002 Standard SP2
  • Nortel Networks Contact Center - CCT

Recommendations

Run all software as a nonprivileged user with minimal access rights.

Ensure that all non-administrative tasks are performed 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 non-executable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.
Microsoft has released security advisory MS07-015 to address this issue in supported versions of affected applications.

Credits

The vendor reported 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 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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