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Internet Explorer "mhtml:" Redirection Disclosure of Sensitive Information
Secunia Advisory: SA19738
Release Date: 2006-04-27
Last Update: 2007-06-12
Popularity: 107,494 views

Critical:
Less critical
Impact: Exposure of sensitive information
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 6.x
Microsoft Outlook Express 5.5
Microsoft Outlook Express 6

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CVE reference:CVE-2006-2111


Description:
codedreamer has discovered a vulnerability in Internet Explorer and Outlook Express, which can be exploited by malicious people to disclose potentially sensitive information.

The vulnerability is caused due to an error in the handling of redirections for URLs with the "mhtml:" URI handler. This can be exploited to access documents served from another web site.

Secunia has constructed a test, which is available at:
http://secunia.com/Internet_Explorer_Arbitrary_Content_Disclosure_Vulnerability_Test/

The vulnerability has been confirmed on a fully patched system with Internet Explorer 6.0 and Microsoft Windows XP SP2. Other versions may also be affected.

Solution:
Apply patches.

Windows XP SP2:
http://www.microsoft.com/downloads/de...=27cca556-0872-4803-b610-4c895ceb99aa

Windows XP Professional x64 Edition (optionally with SP2):
http://www.microsoft.com/downloads/de...=1ea813bf-bddb-40f0-8960-b9debc8413e7

Windows Server 2003 SP1/SP2:
http://www.microsoft.com/downloads/de...=93808a74-035c-4ab7-9283-c693d7bd82be

Windows Server 2003 x64 Edition (optionally with SP2):
http://www.microsoft.com/downloads/de...=f63323a9-e285-45e5-84bd-71ae9da126e3

Windows Server 2003 SP1/SP2 for Itanium-based Systems:
http://www.microsoft.com/downloads/de...=2e62e96e-6571-437d-a612-99175ac39025

Windows Vista:
http://www.microsoft.com/downloads/de...=ee57de19-44ea-48f2-ae28-e76fd2018633

Windows Vista x64 Edition:
http://www.microsoft.com/downloads/de...=343db20f-7794-4423-b11d-885329fbdf78

Provided and/or discovered by:
codedreamer

Changelog:
2006-05-03: Added CVE reference.
2006-10-20: Added Outlook Express as affected.
2007-06-12: Updated "Solution" section.

Original Advisory:
MS07-034 (KB929123):
http://www.microsoft.com/technet/security/bulletin/ms07-034.mspx


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