All AIX NFS anonymous UIDs and GIDs must be configured to values without permissions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-91591	AIX7-00-001055	SV-101689r1_rule		Medium

Description
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.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2020-02-24

Details

Check Text ( C-90745r3_chk )
Check if the "anon" option is set correctly for exported file systems. List exported file systems using command: # exportfs -v /home/doej rw,anon=-1,access=doej Note: Each of the exported file systems should include an entry for the "anon=" option set to "-1" or an equivalent (60001, 60002, 65534, or 65535). If an appropriate "anon=" setting is not present for an exported file system, this is a finding.

Check Text ( C-90745r3_chk )

Check if the "anon" option is set correctly for exported file systems.

List exported file systems using command:

# exportfs -v
/home/doej rw,anon=-1,access=doej

Note: Each of the exported file systems should include an entry for the "anon=" option set to "-1" or an equivalent (60001, 60002, 65534, or 65535).

If an appropriate "anon=" setting is not present for an exported file system, this is a finding.

Fix Text (F-97789r1_fix)
Edit "/etc/exports" and set the "anon=-1" option for all exported file systems without it. Re-export the file systems using command: # exportfs -a