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Microsoft Internet Explorer Event Handling Cross Domain Security Bypass Vulnerability

Risk

High

Date Discovered

October 14, 2008

Description

Microsoft Internet Explorer is prone to a cross-domain security-bypass vulnerability because the application fails to properly enforce the same-origin policy. An attacker can exploit this issue to execute arbitrary script code in another browser window's security zone. This may allow attackers to steal cookie-based authentication credentials and launch other attacks. NOTE: Attackers exploiting this issue on Internet Explorer 6 SP1 running on Microsoft Windows 2000 SP4 may leverage the issue to execute remote code. Other vulnerable versions of the browser are prone only to information disclosure.

Technologies Affected

  • HP Storage Management Appliance 2.1
  • Microsoft Internet Explorer 6.0
  • Microsoft Internet Explorer 6.0 SP1
  • Microsoft Internet Explorer 7.0
  • Nortel Networks CallPilot 1002rp
  • Nortel Networks CallPilot 200i
  • Nortel Networks CallPilot 201i
  • Nortel Networks CallPilot 702t
  • Nortel Networks CallPilot 703t
  • Nortel Networks Contact Center Administration
  • Nortel Networks Contact Center Express
  • Nortel Networks Contact Center Manager Server
  • Nortel Networks Media Processing Svr 100
  • Nortel Networks Media Processing Svr 1000 Rel 3.0
  • Nortel Networks Media Processing Svr 500 Rel 3.0
  • Nortel Networks Peri Application
  • Nortel Networks Peri Workstation
  • Nortel Networks Self-Service Peri Application
  • Nortel Networks Self-Service Peri Workstation
  • Nortel Networks Self-Service Speech Server

Recommendations

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

When possible, run all software as a user with minimal privileges and limited access to system resources. Use additional precautions such as restrictive environments to insulate software that may potentially handle malicious content.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from successful exploits.

Do not follow links provided by unknown or untrusted sources.

Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

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

Since a successful exploit of this issue requires malicious code to execute in web clients, consider disabling support for script code and active content within the client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.

Implement multiple redundant layers of security.

Memory-protection schemes such as nonexecutable stack and heap configurations and randomly mapped memory segments will complicate exploits of memory-corruption vulnerabilities.
Microsoft released an advisory along with fixes to address this issue. Please see the references for more information.

Credits

Gregory Rubin
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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