1. /
  2. Security Response/
  3. Microsoft Internet Explorer Invalid HTML Parsing Code Execution Vulnerability

Microsoft Internet Explorer Invalid HTML Parsing Code Execution Vulnerability

Risk

High

Date Discovered

April 11, 2006

Description

Microsoft Internet Explorer is prone to a vulnerability that may permit remote attackers to execute arbitrary code. This vulnerability occurs when the browser parses invalid HTML. Attackers can exploit this vulnerability through a malicious web page or HTML email.

Technologies Affected

  • Microsoft Internet Explorer 5.0 for Windows 98
  • 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

Recommendations

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

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

Do not follow links provided by unknown or untrusted sources.

Do not follow links provided by unknown or untrusted sources.

Disable any unneccessary default services.

Disable support for HTML email in the email client. This may limit email-based attack vectors for this and other vulnerabilities.

Do not use client software to access unknown or untrusted hosts from critical systems.

Do not visit websites of unknown or questionable integrity. This may limit exposure to this vulnerability.
Microsoft has released a cumulative update to address this issue in affected versions of the browser.

Credits

Jan P. Monsch is credited with the discovery of 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 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.

Threat Intelligence

Subscribe
Follow the Threat Intelligence Twitter feed
STAR Antimalware Protection Technologies
Internet Security Threat Report
Symantec DeepSight Screensaver