Title

The NFS anonymous UID and GID must be configured to values without permissions. (Cat II impact)

Discussion

When an NFS server is configured to deny remote root access, a selected UID and GID are used to handle requests from the remote root user. The UID and GID should be chosen from the system to provide the appropriate level of non-privileged access.

Check Content

Check if the anon option is set correctly for exported file systems. List exported file systems: # exportfs -v Each of the exported file systems should include an entry for the anon= option set to -1 or an equivalent (60001, 65534, or 65535). If an appropriate anon= setting is not present for an exported file system, this is a finding.

Fix Text

Edit /etc/exports and set the anon=-1 option for exports without it. Re-export the file systems.

Additional Identifiers

Rule ID: SV-39006r1_rule

Vulnerability ID: V-932

Group Title: GEN005820

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.