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Microsoft Internet Explorer Popup Cross-Domain Information Disclosure Vulnerability

Risk

Medium

Date Discovered

April 11, 2006

Description

Microsoft Internet Explorer is prone to a cross-domain information-disclosure vulnerability. This vulnerability may let a malicious website access properties of a site in an arbitrary external domain. Attackers could exploit this issue to gain access to sensitive information that is associated with the external domain, such as cookies associated with a user’s session on the external site.

Technologies Affected

  • Microsoft Internet Explorer 5.0.1
  • Microsoft Internet Explorer 5.0.1 SP1
  • Microsoft Internet Explorer 5.0.1 SP2
  • Microsoft Internet Explorer 5.0.1 SP3
  • Microsoft Internet Explorer 5.0.1 SP4
  • Microsoft Internet Explorer 5.0.1 for Windows 2000
  • Microsoft Internet Explorer 5.0.1 for Windows 95
  • Microsoft Internet Explorer 5.0.1 for Windows 98
  • Microsoft Internet Explorer 5.0.1 for Windows NT 4.0
  • Microsoft Internet Explorer 6.0
  • Microsoft Internet Explorer 6.0 SP1
  • Microsoft Internet Explorer 6.0 SP2 - do not use

Recommendations

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

Ensure that all non-administrative tasks, such as browsing the web and reading email, are performed as an unprivileged user with minimal access rights.

Do not follow links provided by unknown or untrusted sources.

Users should never visit sites of questionable integrity or follow links provided by unfamiliar or untrusted sources.

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

Disabling scripting and active content in the Internet Zone may limit exposure to this and other vulnerabilities.

Disable any services that are not needed.

Disable support for HTML email in the email client. This may limit email-based attack vectors for this and other vulnerabilities.
Microsoft has released a cumulative security update to address this issue. Reportedly, the fixes provided in MS06-013 may cause unintended breakage with certain ActiveX controls. Symantec has not confirmed this. Before deploying this patch in production environments, users should thoroughly test the patch to ensure that it doesn't interfere with other software.

Credits

This issue was disclosed by the vendor.
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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