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Insecure Library Loading
Highly critical

Internet Explorer URL Compression Buffer Overflow

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Release Date:  2006-08-23    Last Update:  2006-08-27    Views:  35,253

Secunia Advisory SA21557

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A vulnerability has been reported in Internet Explorer, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to a boundary error in the "CMimeFt::Start()" function within urlmon.dll when processing URLs on a website using HTTP 1.1 and compression. This can be exploited to cause a heap-based buffer overflow via an overly long URL (more than 260 bytes).

Successful exploitation allows execution of arbitrary code when a user is e.g. tricked into visiting a malicious website.

The vulnerability affects Internet Explorer 6 SP1 on Windows 2000 and Windows XP SP1 and was introduced by the MS06-042 patches.


Solution:
Apply patch.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Independently discovered by:
* Dejan Kovacevic, Bold Internet Solutions.
* Derek Soeder, eEye Digital Security.
* Hu Qianwei, NSFocus Security Team.

Original Advisory:
MS06-042 (KB918899):
http://www.microsoft.com/technet/security/bulletin/MS06-042.mspx

Microsoft:
http://www.microsoft.com/technet/security/advisory/923762.mspx
http://support.microsoft.com/kb/923762/
http://blogs.technet.com/msrc/archive/2006/08/24/449860.aspx

eEye Digital Security:
http://research.eeye.com/html/advisories/published/AD20060824.html

NSFocus Security Team:
http://www.nsfocus.com/english/homepage/research/0608.htm

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Internet Explorer URL Compression Buffer Overflow

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