Re: Firefox focus stealing vulnerability (possibly other browsers)

[Claus Färber <GMANE () faerber muc de>]

Michal Zalewski schrieb:
> This probably explains why the core of the problem wasn't fixed for
> Firefox: reports were repeatedly reduced to an issue with hiding file
> input fields by manipulating opacity or visibility (in my example, I
> placed the box off-screen to the left, at negative absolute coords,
> instead). A proper solution would be to restrict the ability for scripts
> to manipulate focus and read contents of file input fields, instead.

A proper solution would be to keep a list of files explicitly selected 
by the user and only allow uploads of files in this list. Then even if a 
script can manipulate the field, the browser won't upload files that 
have not been selected by the user.

Claus