Title

The Network File System (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 nfs-kernel-server package is installed. It contains the exportfs command as well as the nfsserver process itself. # rpm –q nfs-kernel-server If the package is not installed, this check does not apply. If it is installed, check if the 'anonuid' and 'anongid' options are set correctly for exported file systems. List exported filesystems: # exportfs -v Each of the exported file systems should include an entry for the 'anonuid=' and 'anongid=' options set to "-1" or an equivalent (60001, 65534, or 65535). If appropriate values for 'anonuid' or 'anongid' are not set, this is a finding.

Fix Text

Edit "/etc/exports" and set the "anonuid=-1" and "anongid=-1" options for exports lacking it. Re-export the filesystems.

Additional Identifiers

Rule ID: SV-46123r1_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.