[Facebooker-talk] Possible Security Hole in Facebooker -- Please Update!

[David Clements]

In case it got lost in my grumpiness last night.

The patch to fix this issue simply turned off adapter support.  Is that
correct?

I sent a pull request from my fork
http://github.com/digidigo/facebooker/tree/master  which should fix the
issue and preserve the behavior.  If anyone is using Facebooker to run
multiple apps or Bebo it would be great if you could check it out and make
sure that it didn't break.

Thanks,

Dave

On 2/24/09, vincent chu <vincentchu at gmail.com> wrote:
>
> Hi all ---
>
> In the course of developing our Facebook connect app, we realized that
> there was a  security hole in Facebooker that allows any malicious user to
> change the state of the Facebooker module and crash any controller/view that
> uses Facebooker to capture a Facebook session. For Facebook connect apps,
> this could potentially be in any view that uses the "set_facebook_session"
> before_filter.
>
> All the malicious user has to do is send a malformed HTTP request similar
> to:
>
> http://my.rails.app.com/some_controller/?fb_sig_api_key=you_are_pwned
>
> The problem comes in the 'set_adapter' method of
> 'facebooker/lib/facebooker/rails/controller.rb' where Facebooker will
> attempt to load an adapter from the params hash if fb_sig_api_key is in the
> request (ignoring the configuration found in the facebooker.yml file). In
> this case, Facebooker would dutifully set the api_key to "you_are_pwned" and
> any subsequent call to Facebooker would try and use "you_are_pwned" as the
> api_key, causing it to crash the site.
>
> Kevin Lochner's already pushed an update to github, so update to the latest
> commit:
>
> 6a954874369354324d87b2fe09c24db4bd485faf
>
> http://github.com/mmangino/facebooker/commit/6a954874369354324d87b2fe09c24db4bd485faf
>
> Cheers,
>
> Vince
>
> ----
> Vincent Chu
> Department of Applied Physics
> Geballe Laboratory of Advanced Materials
> McCullough Bldg. 318
> 476 Lomita Mall
> Stanford, CA, 94305
>
> Consider this:
> "The smallest positive integer not definable in under eleven words."
>
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>
>
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