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  3. Microsoft Windows Messenger ActiveX Control Information Disclosure Vulnerability

Microsoft Windows Messenger ActiveX Control Information Disclosure Vulnerability

Risk

Medium

Date Discovered

August 12, 2008

Description

Microsoft Windows Messenger is prone to an information-disclosure vulnerability. An attacker can exploit this issue by enticing an unsuspecting victim to visit a malicious HTML page. Successfully exploiting this issue allows remote attackers to obtain sensitive information that may aid in further attacks.

Technologies Affected

  • Microsoft Windows Messenger 4.7
  • Microsoft Windows Messenger 5.1

Recommendations

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

To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Do not follow links provided by unknown or untrusted sources.

To reduce the likelihood of successful attacks, never follow links provided by unknown or untrusted individuals.

Set web browser security to disable the execution of script code or active content.

Since a successful exploit of this issue allows malicious code to execute in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.

Review and adjust according to policy any default configuration settings.

To mitigate the possibility of an exploit through HTML email, configure email clients to render messages in plain text. This mitigation may adversely affect some functionality of email clients.
The vendor has released updates and an advisory. Please see the references for more information.

Credits

Haifei Li (cocoruder) of the Fortinet Security Research Team
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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