What determines whether a machine can receive RPC requests from another machine?
The primary factor is whether the requester has the ability to deliver data to ports 137, 138, 139 and 443 UDP. A properly-configured firewall will block these ports and protect an affected machine from an Internet-based attack. Within a network, though, it’s likely that any machine would be capable to making a request via these ports. RPC calls also can be made via other networking protocols such as IPX and NetBEUI. However, neither of these protocols are typically supported on the Internet, and this would tend to reinforce this vulnerability’s status as primarily an intranet-based one.
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