1. /
  2. Security Response/
  3. Microsoft Internet Explorer DHTML Object Race Condition Memory Corruption Vulnerability

Microsoft Internet Explorer DHTML Object Race Condition Memory Corruption Vulnerability

Risk

High

Date Discovered

April 12, 2005

Description

A vulnerability in Microsoft Internet Explorer may allow remote attackers to execute arbitrary code in the context of users visiting malicious Web sites. This issue presents itself the affected application attempts to process certain script objects, a race condition may lead to the execution of attacker-supplied code.

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 5.5
  • Microsoft Internet Explorer 5.5 SP1
  • Microsoft Internet Explorer 5.5 SP2
  • 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.

Non-administrative software should be run as non-administrative users with the least privileges required. This will limit the potential damage that successful exploitation may achieve.

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

Exploitation of this vulnerability requires the execution of malicious script code in the affected Web browser. Disabling script code and active content support within the affected browser should prevent successful exploitation of this issue. It should be noted that this mitigation tactic might adversely affect legitimate Web sites that rely on the execution of browser based script code.

Do not accept communications that originate from unknown or untrusted sources.

Users should not follow suspicious links, or open email that originates from unknown or untrusted sources.

Review and adjust according to policy any default configuration settings.

Users should disable HTML rendering of email messages in Outlook and Outlook Express, as this will limit the possibility of successful exploitation.
Microsoft has released updates to address this vulnerability on supported platforms. Internet Explorer 6 for Windows Server 2003 SP 1 including 64-Bit Edition is not affected by this issue. Windows XP Professional x64 Edition is also not affected. Microsoft has released fixes for Windows 98, Windows 98 Second Edition, and Windows Millennium Edition. These updates are available from the Windows Update Web site: http://go.microsoft.com/fwlink/?LinkId=21130 Localized Slovenian and Slovakian fixes are available for Windows 98, Windows 98 Second Edition, and Windows Millennium Edition as well. Please see the referenced Microsoft bulletin for more information.

Credits

Berend-Jan Wever is credited for 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