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Firefox File Upload Form Keystroke Event Cancel Vulnerability

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Release Date:  2006-06-06    Last Update:  2007-10-19    Views:  51,822

Secunia Advisory SA20442

Where:

From remote

Impact:

Exposure of sensitive information

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Charles McAuley has discovered a vulnerability in Firefox, which can be exploited by malicious people to trick users into disclosing sensitive information.

The vulnerability is caused due to a design error where a script can cancel certain keystroke events when entering text. This can be exploited to trick a user into typing a filename in a file upload input field by changing focus and canceling the "OnKeyPress" JavaScript event on certain characters.

Successful exploitation allows an arbitrary file on the user's system to be uploaded to a malicious web site, but requires that the user type text containing the characters of the filename.

The vulnerability is confirmed in version 1.5.0.4 and 2.0.0.1. Other versions may also be affected.


Solution:
Update to version 2.0.0.8.

Provided and/or discovered by:
Charles McAuley

Additional Information:
Michal Zalewski

NOTE: A variant of this vulnerability was reported in a Mozilla Bugzilla bug entry back in 2000.

Original Advisory:
Mozilla Foundation:
http://www.mozilla.org/security/announce/2007/mfsa2007-32.html

Charles McAuley:
http://lists.grok.org.uk/pipermail/full-disclosure/2006-June/046610.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: Firefox File Upload Form Keystroke Event Cancel Vulnerability

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