A weakness has been discovered 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 18.104.22.168. Other versions may also be affected.
Solution: Update to version 22.214.171.124.
Provided and/or discovered by: Hong
Original Advisory: Mozilla Foundation:
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Subject: Firefox "OnKeyDown" Event Focus Weakness
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