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Mozilla / Firefox "Save Link As" Download Dialog Spoofing

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Release Date:  2005-03-01    Last Update:  2005-03-02    Views:  49,957

Secunia Advisory SA13258

Where:

From remote

Impact:

Spoofing

Solution Status:

Vendor Patch

CVE Reference(s):

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.

Further details available to Secunia VIM customers

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

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

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