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Microsoft Internet Explorer CSS Tag Memory Corruption Vulnerability

Risk

High

Date Discovered

June 12, 2007

Description

Microsoft Internet Explorer is prone to a remote code-execution vulnerability because the application fails to properly handle certain CSS data. A remote attacker can exploit this issue to execute arbitrary code in the context of the user running the vulnerable application.

Technologies Affected

  • Avaya CIE 1.0
  • Avaya Messaging Application Server
  • Avaya Messaging Application Server MM 2.0
  • Avaya Messaging Application Server MM 3.0
  • Avaya Messaging Application Server MM 3.1
  • HP Storage Management Appliance 2.1
  • Microsoft Internet Explorer 6.0
  • Microsoft Internet Explorer 6.0 SP1
  • Nortel Networks Centrex IP Client Manager
  • Nortel Networks Centrex IP Client Manager 7.0.0
  • Nortel Networks Centrex IP Client Manager 8.0.0
  • Nortel Networks Centrex IP Client Manager 9.0

Recommendations

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

To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Do not follow links provided by unknown or untrusted sources.

Attackers could exploit this vulnerability by enticing a user to visit a malicious website. Do not follow links provided by sources of questionable integrity.

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

Disable support for script code and active content within a 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.

Since this issue may be leveraged to execute code, we recommend memory-protection schemes, such as nonexecutable stack/heap configurations and randomly mapped memory segments. This tactic may complicate exploits of memory-corruption vulnerabilities.

Review and adjust according to policy any default configuration settings.

To limit the possibility of remote exploits through email, configure email client applications to view messages as plain text.
Microsoft has released security bulletin MS07-033 with fixes to address this issue. Please see the referenced bulletin for information on obtaining fixes.

Credits

The vendor disclosed this issue.
Copyright © Symantec Corporation.
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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.
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