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Peer to Peer Security Question

Does anyone know what the security ramifications of letting peer to peer applications operate on a network with a PIX firewall? The inside user can make multiple state full connections with software’s such as Kazaa, eDonkey, etc going out but is it possible for a hacker or regular outside p2p user to exploit the connections to come back into the user without high jacking a connection. An example would be an inside user that has a shared folder (with the p2p application active) for files they want to share; can someone from the outside do a search and see the inside users folder and be able to download those files without the inside user having to make a connection to the searcher? By the way can Instant Messaging and ICQ do this also?

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Re: Peer to Peer Security Question

AIM needs tcp port 5190 open to receive files via transfer.

p2p is generally insecure. many of the programs come with spyware. a lot of the files shares are virus infected. some p2p apps work behind a firewall, but only for downloading files, not sharing (i.e. serving) them out

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