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Status Not under consideration
Workspace AIX
Created by Guest
Created on Apr 11, 2017

RELATED IDEAS

QID 11 Hidden RPC Service

QID = 11
Title=Hidden RPC Service
Severity=2
Impact = Unauthorized users can build a list of RPC services running on the host. If they discover vulnerable RPC services on the host, they then can exploit them.
Threat= The Portmapper/Rpcbind listens on port 111 and stores an updated list of registered RPC services running on the server (RPC name, version and port number). It acts as a "gateway" for clients wanting to connect to any RPC daemon.

When the portmapper/rpcbind is removed or firewalled, standard RPC client programs fail to obtain the portmapper list. However, by sending carefully crafted packets, it's possible to determine which RPC programs are listening on which port. This technique is known as direct RPC scanning. It's used to bypass portmapper/rpcbind in order to find RPC programs running on a port (TCP or UDP ports). On Linux servers, RPC services are typically listening on privileged ports (below 1024), whereas on Solaris, RPC services are on temporary ports (starting with port 32700).

Solution= Firewalling the portmapper port or removing the portmapper service is not sufficient to prevent unauthorized users from accessing the RPC daemons. You should remove all RPC services that are not strictly required on this host.

Idea priority High
  • Guest
    Reply
    |     Nov 1, 2017

    I think there is a misunderstanding here. It sounds like this is a warning or notification from a security scan saying that some RPC services can have vulnerabilities and it found some RPC services using direct RPC scanning techniques or through the portmapper. The solution is to disable any unneeded running RPC services. If you require any RPC services, you will continue to see this warning.

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