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  3. Microsoft Internet Explorer Javaprxy.DLL COM Object Instantiation Heap Overflow Vulnerability

Microsoft Internet Explorer Javaprxy.DLL COM Object Instantiation Heap Overflow Vulnerability

Risk

High

Date Discovered

June 29, 2005

Description

Microsoft Internet Explorer is prone to a heap-based buffer-overflow vulnerability that occurs when the 'javaprxy.dll' COM object is instantiated by a malicious webpage. Attackers may exploit this issue to execute arbitrary code in the context of the client.

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
  • Nortel Networks Centrex IP Client Manager

Recommendations

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

To limit the impact of browser vulnerabilities, perform nonadministrative activities as an unprivileged user with minimal access rights.

Do not follow links provided by unknown or untrusted sources.

Users should be wary of visiting sites of questionable integrity, especially if enticed to do so in unsolicited email.
The vendor has released an advisory (903144) that contains workarounds to prevent exploits of this issue. Customers are urged to review the referenced advisory for further information. Microsoft has released security bulletin MS05-037 along with fixes to address this issue. Please see the referenced advisory for more information. Nortel has released bulletin number 2005006061 describing vulnerable packages. Fixes are not currently available. Please see the referenced document for details.

Credits

Discovery is credited to sk0L and Martin Eiszner of SEC-CONSULT.
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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