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The NFS server must not have the all_squash option enabled.


Finding ID Version Rule ID IA Controls Severity
V-38460 RHEL-06-000515 SV-50260r1_rule Low
The "all_squash" option maps all client requests to a single anonymous uid/gid on the NFS server, negating the ability to track file access by user ID.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2015-05-26


Check Text ( C-46016r1_chk )
If the NFS server is read-only, in support of unrestricted access to organizational content, this is not applicable.

The related "root_squash" option provides protection against remote administrator-level access to NFS server content. Its use is not a finding.

To verify the "all_squash" option has been disabled, run the following command:

# grep all_squash /etc/exports

If there is output, this is a finding.
Fix Text (F-43405r1_fix)
Remove any instances of the "all_squash" option from the file "/etc/exports". Restart the NFS daemon for the changes to take effect.

# service nfs restart