Title

The NFS exports configuration file must not have an extended ACL. (Cat III impact)

Discussion

File system extended ACLs provide access to files beyond what is allowed by the mode numbers of the files. Excessive permissions on the NFS export configuration file could allow unauthorized modification of the file, which could result in Denial of Service to authorized NFS exports and the creation of additional unauthorized exports.

Check Content

Check the group ownership of the NFS export configuration file. # ls -lL /etc/dfs/dfstab If the permissions include a "+", the file has an extended ACL and this is a finding.

Fix Text

Remove the extended ACL from the file. # chmod A- /etc/dfs/dfstab

Additional Identifiers

Rule ID: SV-227916r603266_rule

Vulnerability ID: V-227916

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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