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

[Mike Mangino]

How would you recommend this be handled? Vincent reported the issue  
privately last week and waited to publicly report it until a fix was  
in the main branch. It was my call to report it publicly now. Is there  
some way we can do this better?

Mike

On Feb 25, 2009, at 12:31 AM, David Clements wrote:

> I forked the repo and fixed this issue without removing the  
> functionality.
>
> I sent a pull request from
>
> http://github.com/digidigo/facebooker/tree/master
>
> In the future I would appreciate a little more discretion around  
> security issues.  Publicizing it in this way required me to fix it  
> immediately on my production environment rather than being able to  
> wait for morning.
>
> Dave
>
> On 2/24/09, David Clements <digidigo at gmail.com> wrote:
> Does this change simply remove support for multiple adapters?
>
> Dave
>
>
>
> On Tue, Feb 24, 2009 at 6:06 PM, 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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--
Mike Mangino
http://www.elevatedrails.com



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