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  3. Microsoft Internet Explorer PNG Deflate Heap Corruption Vulnerability

Microsoft Internet Explorer PNG Deflate Heap Corruption Vulnerability

Risk

High

Date Discovered

December 12, 2002

Description

A heap corruption vulnerability has been reported for Microsoft Internet Explorer. The vulnerability is related to the way that Microsoft Internet Explorer interprets PNG image data. The function that handles the deflation of PNG images does not properly handle some invalid data within PNG image files. An attacker can exploit this vulnerability by tricking a user into viewing a maliciously constructed PNG image file. When the image file is rendered it will trigger the heap corruption condition and overwrite critical areas in memory. Any malicious attacker-supplied code will be executed with elevated privileges. It should be noted that applications which depend on MSIE to render PNG files are also affected.

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 5.5
  • Microsoft Internet Explorer 5.5 SP1
  • Microsoft Internet Explorer 5.5 SP2
  • Microsoft Internet Explorer 6.0

Recommendations

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

Browsing the web as a low-privileged user will limit the consequences of malicious code being executed.

Do not follow links provided by unknown or untrusted sources.

Be extremely careful when following links sent by unknown individuals. If possible, always ensure that any email that has been received is solicited before reading the contents.
This vulnerability has been resolved in MSIE 6.0 SP 1. Users are advised to obtain the latest version of MSIE.

Credits

Vulnerability discovery credited to Eeye Digital Security.
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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