pdp
13/02/07, 19:42
explanation of how the attack works here:
http://www.gnucitizen.org/blog/browser-focus-rip
On 2/12/07, Michal Zalewski <lcamtuf@dione.ids.pl> wrote:
> On Mon, 12 Feb 2007, [ISO-8859-1] Claus F=E4rber wrote:
>
> > 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.
>
> Not necessarily that easy: notice that it is the user who enters the name
> of a target file.
>
> Unless you want to prevent the browser from accepting any files that were
> not chosen using a visual file selector widget - but in such a case,
> there's not much point in having a manual file path entry box in the firs=
t
> place.
>
> /mz
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
>
--=20
pdp (architect) | petko d. petkov
http://www.gnucitizen.org
http://www.gnucitizen.org/blog/browser-focus-rip
On 2/12/07, Michal Zalewski <lcamtuf@dione.ids.pl> wrote:
> On Mon, 12 Feb 2007, [ISO-8859-1] Claus F=E4rber wrote:
>
> > 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.
>
> Not necessarily that easy: notice that it is the user who enters the name
> of a target file.
>
> Unless you want to prevent the browser from accepting any files that were
> not chosen using a visual file selector widget - but in such a case,
> there's not much point in having a manual file path entry box in the firs=
t
> place.
>
> /mz
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
>
--=20
pdp (architect) | petko d. petkov
http://www.gnucitizen.org