SLEM 5 file systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.

The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files, as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.

Verify SLEM 5 file systems that are being NFS exported are mounted with the "noexec" option with the following command:

     > grep nfs /etc/fstab
     UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,noexec 0 0

If a file system found in "/etc/fstab" refers to NFS and it does not have the "noexec" option set, and use of NFS exported binaries is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.

Configure SLEM 5 "/etc/fstab" file to use the "noexec" option on file systems that are being exported via NFS.