Internet Explorer FTP Download Directory Traversal
Secunia Advisory: SA13704
Release Date: 2005-01-03
Last Update: 2006-03-23
Popularity: 53,405 views

Critical:
Moderately critical
Impact: System access
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft Internet Explorer 5.01
Microsoft Internet Explorer 5.5
Microsoft Internet Explorer 6.x

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CVE reference:CVE-2004-1376


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

The vulnerability is caused due to an input validation error in the handling of FTP file transfers. This can be exploited by a malicious FTP server to create files in arbitrary locations via directory traversal attacks by tricking a user into downloading malicious files (e.g. by dragging or copying a file or folder).

The vulnerability has been confirmed on a fully patched system with Internet Explorer 6.0 and Microsoft Windows 2000 SP4 / XP SP1.

Solution:
Apply patches.

For details:
SA17163

Provided and/or discovered by:
Reported by vendor in KB article.

Later discovered and reported by Albert Puigsech Galicia.

Changelog:
2005-01-10: Added link to Microsoft KB article.
2005-01-19: Added CVE reference.
2006-03-23: Updated "Solution" section.

Original Advisory:
Microsoft KB Article:
http://support.microsoft.com/kb/810790

Albert Puigsech Galicia:
http://www.7a69ezine.org/node/view/176

Other References:
Secunia:
http://secunia.com/advisories/17163/


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