[funsec] Facebook Image Privacy

Dan Kaminsky dan at doxpara.com
Sun Jan 17 13:38:20 CST 2010


On Sun, Jan 17, 2010 at 8:16 PM, Imri Goldberg <lorgandon at gmail.com> wrote:

> On Sun, Jan 17, 2010 at 9:08 PM, Dan Kaminsky <dan at doxpara.com> wrote:
>
>> And a computer that isn't at the bottom of the Mariana Trench ain't
>> secure.
>>
>> Unguessable tokens have a long history of use in our field (CSRF tokens,
>> etc) and having one lock access to an image is relatively legitimate.  If
>> there was a way to guess the token, we'd say there was an issue.
>>
>
> I think the difference is how long you expect that token to be kept. The
> link given, afaict, is a permanent one, unlike csrf tokens or various change
> password tokens.
>
>
It's a password to a single asset, which is retrieved in its entirety.  If
you allow "omg, somebody could share the link" to be considered a security
hole, then I can see the stories now...

"OMG!  Save Picture!"
"OMG!  Print Screen!"
"OMG!  SOMEBODY COULD TAKE A PHOTO OF THEIR SCREEN!"

:)
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