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Microsoft Internet Explorer PNG Image Rendering Buffer Overflow Vulnerability

Risk

High

Date Discovered

June 14, 2005

Description

Microsoft Internet Explorer is prone to a buffer overflow vulnerability. This issue exists in the PNG image rendering library used by the browser. Successful exploitation will result in execution of arbitrary code in the context of the currently logged in user. This issue is present in the PNG image rendering library, so it is possible that other applications that use the library are affected. This is not confirmed and Symantec is not aware of any such applications.

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

Do not accept or execute files from untrusted or unknown sources.

Users should avoid accepting or opening unexpected files, especially if they arrive in email from an untrusted or unfamiliar source.

Do not follow links provided by unknown or untrusted sources.

Users should be wary of visiting Web sites of questionable integrity, especially if solicited to do so by an unfamiliar or untrusted source through email or other means. This may limit exposure to many Web-based attacks.

Implement multiple redundant layers of security.

Memory protection schemes such as non-executable stack/heap configurations and randomly mapped memory segments may complicate exploitation of memory corruption vulnerabilities.

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

All non-administrative activities should be performed as an unprivileged user with minimal access rights. This will limit the impact of vulnerabilities that may be exploited through Web or email attack vectors.
Microsoft has released a cumulative update for Internet Explorer to address supported versions of the browser. Fixes for Windows 98/SE/ME can be obtained through Windows Update.

Credits

Discovery is credited to Neel Mehta of ISS X-Force.
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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