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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.

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Read the rest of this advisory here:
http://www.securitypentest.com/2011/10/facebook-attach-exe-vulnerability.html


Enjoy :)


Nathan Power
www.securitypentest.com