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XCCDF
Guide to the Secure Configuration of Ubuntu 22.04
Services
NFS and RPC
Configure All Systems which Use NFS
Make Each System a Client or a Server, not Both
Make Each System a Client or a Server, not Both
An XCCDF Group - A logical subset of the XCCDF Benchmark
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Make Each System a Client or a Server, not Both
If NFS must be used, it should be deployed in the simplest configuration possible to avoid maintainability problems which may lead to unnecessary security exposure. Due to the reliability and security problems caused by NFS (specially NFSv3 and NFSv2), it is not a good idea for systems which act as NFS servers to also mount filesystems via NFS. At the least, crossed mounts (the situation in which each of two servers mounts a filesystem from the other) should never be used.