Guide to the Secure Configuration of Red Hat Enterprise Linux 7
Rules, Groups, and Values defined within the XCCDF Benchmark
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NFS and RPC
The Network File System is a popular distributed filesystem for the Unix environment, and is very widely deployed. This section discusses the circ...Group -
Uninstall nfs-utils Package
Thenfs-utilspackage can be removed with the following command:$ sudo yum erase nfs-utils
Rule Low Severity -
Disable All NFS Services if Possible
If there is not a reason for the system to operate as either an NFS client or an NFS server, follow all instructions in this section to disable sub...Group -
Disable Network File Systems (netfs)
The netfs script manages the boot-time mounting of several types of networked filesystems, of which NFS and Samba are the most common. If these fil...Rule Unknown Severity -
Disable Services Used Only by NFS
If NFS is not needed, disable the NFS client daemons nfslock, rpcgssd, and rpcidmapd. <br><br> All of these daemons run with elevated privileges, a...Group -
Uninstall rpcbind Package
The rpcbind utility maps RPC services to the ports on which they listen. RPC processes notify rpcbind when they start, registering the ports they a...Rule Low Severity -
Disable Network File System Lock Service (nfslock)
The Network File System Lock (nfslock) service starts the required remote procedure call (RPC) processes which allow clients to lock files on the s...Rule Unknown Severity -
Disable rpcbind Service
The rpcbind utility maps RPC services to the ports on which they listen. RPC processes notify rpcbind when they start, registering the ports they a...Rule Low Severity -
Disable Secure RPC Client Service (rpcgssd)
The rpcgssd service manages RPCSEC GSS contexts required to secure protocols that use RPC (most often Kerberos and NFS). The rpcgssd service is the...Rule Unknown Severity -
Disable RPC ID Mapping Service (rpcidmapd)
The rpcidmapd service is used to map user names and groups to UID and GID numbers on NFSv4 mounts. If NFS is not in use on the local system then th...Rule Unknown Severity -
Configure All Systems which Use NFS
The steps in this section are appropriate for all systems which run NFS, whether they operate as clients or as servers.Group -
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 s...Group -
Configure NFS Services to Use Fixed Ports (NFSv3 and NFSv2)
Firewalling should be done at each host and at the border firewalls to protect the NFS daemons from remote access, since NFS servers should never b...Group -
Configure lockd to use static TCP port
Configure the <code>lockd</code> daemon to use a static TCP port as opposed to letting the RPC Bind service dynamically assign a port. Edit the fil...Rule Unknown Severity -
Configure lockd to use static UDP port
Configure the <code>lockd</code> daemon to use a static UDP port as opposed to letting the RPC Bind service dynamically assign a port. Edit the fil...Rule Unknown Severity -
Configure mountd to use static port
Configure the <code>mountd</code> daemon to use a static port as opposed to letting the RPC Bind service dynamically assign a port. Edit the file <...Rule Unknown Severity -
Configure statd to use static port
Configure the <code>statd</code> daemon to use a static port as opposed to letting the RPC Bind service dynamically assign a port. Edit the file <c...Rule Unknown Severity -
Configure NFS Clients
The steps in this section are appropriate for systems which operate as NFS clients.Group -
Disable NFS Server Daemons
There is no need to run the NFS server daemons <code>nfs</code> and <code>rpcsvcgssd</code> except on a small number of properly secured systems de...Group -
Disable Network File System (nfs)
The Network File System (NFS) service allows remote hosts to mount and interact with shared filesystems on the local system. If the local system is...Rule Unknown Severity
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