[Vulnerabilidad] Internet Explorer File Download Extension Spoofing

Fuente: http://www.secunia.com/advisories/10736/

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Microsoft Internet Explorer File Download Extension Spoofing

Secunia Advisory: SA10736
Release Date: 2004-01-28

Critical:
Moderately critical
Impact: Security Bypass
Where: From remote

Software: Microsoft Internet Explorer 6

Description:
http-equiv has identified a vulnerability in Internet Explorer,
allowing malicious web sites to spoof the file extension of
downloadable files.

The problem is that Internet Explorer can be tricked into opening a
file, with a different application than indicated by the file
extension. This can be done by embedding a CLSID in the file name.
This could be exploited to trick users into opening "trusted" file
types which are in fact malicious files.

Secunia has created an online test:

This has been reported to affect Microsoft Internet Explorer 6.

NOTE: Prior versions may also be affected.

Solution:
Do not use "Open" file, always save files to a folder as this reveals
the suspicious filename.

Provided and/or discovered by:
http-equiv



Ille Corvus. Hic et Nunc.

Filtrado(s) (KillFile):
JM Tella Llop (25/10/2003)