Re: Facebook Attach EXE Vulnerability

[Dave <mrx () propergander org uk>]

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> I think they need a better way to sift the wheat from the chaff.

Numbers can be magic and eight bytes is enough of a taste to tell honey from vinegar.


Nice find
Dave





On 28/10/2011 18:56, Pablo Ximenes wrote:
> I see. I have seen this kinda behavior from vendors too often. I supose the reason for this is the flood of false 
> positives. I think they
> need a better way to sift the wheat from the chaff.
>
> Congrats for your work!
>
> 2011/10/28 Nathan Power <np () securitypentest com>
>
> > I was basically told that Facebook didn't see it as an issue and I was puzzled by that. Ends up the Facebook 
> > security team had issues
> > reproducing my work and that's why they initially disgarded it. After publishing, the Facebook security team 
> > re-examined the issue and by
> > working with me they seem to have been able to reproduce the bug.
> >
> >
> > Nathan Power www.securitypentest.com
> >
> >
> > On Fri, Oct 28, 2011 at 11:18 AM, Pablo Ximenes <pablo () ximen es> wrote:
> >
> > > Not fixed yet. At least not yesterday when I checked.
> > >
> > > Nathan, didn't Facebook ask for some time to fix this bug after they have acknowledged it?
> > >
> > >
> > > Pablo Ximenes <http://ximen.es/>http://ximen.es/ <http://twitter.com/pabloximenes>http://twitter.com/pabloximenes
> > >
> > > Em 27/10/2011, às 19:29, Joshua Thomas < <rappercrazzy () gmail com> rappercrazzy () gmail com> escreveu:
> > >
> > > can't believe such was on FB  .... wahahaha !!! lol ....rofl ...
> > >
> > > When was this discovered and fixed ?
> > >
> > >
> > > On Thu, Oct 27, 2011 at 1:02 AM, Nathan Power < <np () securitypentest com><np () securitypentest com> np () 
> > > securitypentest com> wrote:
> > >
> > > > --------------------------------------------------------------------------------- 1. Summary:
> > > >
> > > > When using the Facebook 'Messages' tab, there is a feature to attach a file. Using this feature normally, the site 
> > > > won't allow a user
> > > > to attach an executable file. A bug was discovered to subvert this security mechanisms. Note, you do NOT have to 
> > > > be friends with the
> > > > user to send them a message with an attachment.
> > > >
> > > >
> > > > ---------------------------------------------------------------------------------
> > > >
> > > > Read the rest of this advisory here:
> > > >
> > > > <http://www.securitypentest.com/2011/10/facebook-attach-exe-vulnerability.html><http://www.securitypentest.com/2011/10/facebook-attach-exe-vulnerability.html>
http://www.securitypentest.com/2011/10/facebook-attach-exe-vulnerability.html
> > > > Enjoy :)
> > > >
> > > >
> > > > Nathan Power <http://www.securitypentest.com> <http://www.securitypentest.com> www.securitypentest.com
> > > >
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