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TITLE:
Firefox "OnKeyDown" Event Focus Weakness

SECUNIA ADVISORY ID:
SA25904

VERIFY ADVISORY:
http://secunia.com/advisories/25904/

CRITICAL:
Not critical

IMPACT:
Exposure of sensitive information

WHERE:
>From remote

SOFTWARE:
Mozilla Firefox 1.x
http://secunia.com/product/4227/
Mozilla Firefox 2.0.x
http://secunia.com/product/12434/

DESCRIPTION:
Carl Hardwick has discovered a weakness in Firefox, which potentially
can be exploited by malicious people to disclose sensitive
information.

The weakness is caused due to a design error within the focus
handling of form fields and can potentially be exploited by changing
the focus from a "textarea" field to a "file upload" form field via
the "OnKeyDown" event.

Successful exploitation allows an arbitrary file on the user's system
to be uploaded to a malicious web site, but requires that the user is
tricked into typing the file name into a "textarea" input form.

The weakness is confirmed in version 2.0.0.4. Other versions may also
be affected.

SOLUTION:
Disable JavaScript support.

Do not enter file names to form fields on untrusted web sites.

PROVIDED AND/OR DISCOVERED BY:
Carl Hardwick

ORIGINAL ADVISORY:
http://archives.neohapsis.com/archives/fulldisclosure/2007-06/0646.html

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