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TITLE:
Mozilla / Firefox "Save Link As" Download Dialog Spoofing

SECUNIA ADVISORY ID:
SA13258

VERIFY ADVISORY:
http://secunia.com/advisories/13258/

CRITICAL:
Less critical

IMPACT:
Spoofing

WHERE:
>From remote

SOFTWARE:
Mozilla Firefox 1.x
http://secunia.com/product/4227/
Mozilla Firefox 0.x
http://secunia.com/product/3256/
Mozilla 1.7.x
http://secunia.com/product/3691/
Mozilla 1.6
http://secunia.com/product/3101/
Mozilla 1.5
http://secunia.com/product/2478/
Mozilla 1.4
http://secunia.com/product/1481/
Mozilla 1.3
http://secunia.com/product/1480/
Mozilla 1.2
http://secunia.com/product/3100/
Mozilla 0.x
http://secunia.com/product/772/
Mozilla 1.0
http://secunia.com/product/97/
Mozilla 1.1
http://secunia.com/product/98/

DESCRIPTION:
Secunia Research has discovered a vulnerability in Mozilla and
Mozilla Firefox, which can be exploited by malicious people to trick
users into downloading malicious files.

The problem is that the browser uses the URL to determine the file
type association in the "Save Link As" download dialog, but uses the
filename from the "Content-Disposition" HTTP header when saving the
downloaded file. This can be exploited by a malicious web site to
spoof file types in the "Save Link As" download dialog.

Successful exploitation can lead to malware being saved to the
download directory (default is the desktop on Mozilla Firefox).

NOTE: Exploitation requires that the option "Hide extension for known
file types" is enabled in Windows (default setting).

The vulnerability has been confirmed in Mozilla 1.7.3 and Mozilla
Firefox 1.0 for Windows. Other versions may also be affected.

SOLUTION:
The vendor has issued updated versions.

Mozilla Firefox 1.0.1:
http://www.mozilla.org/products/firefox/

Mozilla 1.7.5:
http://www.mozilla.org/products/mozilla1.x/

PROVIDED AND/OR DISCOVERED BY:
Andreas Sandblad, Secunia Research.

ORIGINAL ADVISORY:
Secunia Research:
http://secunia.com/secunia_research/2004-21/advisory/

Mozilla:
http://www.mozilla.org/security/announce/mfsa2005-22.html

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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