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  3. Microsoft Internet Explorer HTTP 1.1 and Compression Long URI Buffer Overflow Variant Vulnerability

Microsoft Internet Explorer HTTP 1.1 and Compression Long URI Buffer Overflow Variant Vulnerability

Risk

High

Date Discovered

September 12, 2006

Description

Microsoft Internet Explorer is prone to a remote buffer-overflow vulnerability. A successful exploit may result in arbitrary code-execution in the context of the user running the browser. This issue was introduced with the rereleased patches of Microsoft advisory MS06-042. This issue is nearly identical to that discussed in BID 19667 (Microsoft Internet Explorer HTTP 1.1 and Compression Long URI Buffer Overflow Vulnerability), but is a separate vulnerability.

Technologies Affected

  • Microsoft Internet Explorer 5.0.1 SP4
  • Microsoft Internet Explorer 6.0
  • Microsoft Internet Explorer 6.0 SP1

Recommendations

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

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

Do not follow links provided by unknown or untrusted sources.

An attacker must convince a vulnerable user to view a malicious web page to exploit this issue. Never follow links provided by unknown sources from a critical computer.

Implement multiple redundant layers of security.

Various memory-protection schemes (such as non-executable and randomly mapped memory segments) may hinder an attacker's ability to exploit this vulnerability to execute arbitrary code.
Microsoft Security Bulletin MS06-042 has been reissued to address this issue. Please see the referenced advisory for more information. Microsoft Security Bulletin MS06-042 has been updated to address a flaw in Mshtml.dll that was introduced in the previous fixes. Please see the referenced advisory for more information.

Credits

Derek Soeder of eEye Digital Security is credited with the discovery of this vulnerability.
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.
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