AIX nosuid option must be enabled on all NFS client mounts.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-215210 | AIX7-00-001056 | SV-215210r508663_rule | Medium |
| Description |
|---|
| Enabling the nosuid mount option prevents the system from granting owner or group-owner privileges to programs with the suid or sgid bit set. If the system does not restrict this access, users with unprivileged access to the local system may be able to acquire privileged access by executing suid or sgid files located on the mounted NFS file system. |
| STIG | Date |
|---|---|
| IBM AIX 7.x Security Technical Implementation Guide | 2022-06-06 |
Details
| Check Text ( C-16408r294081_chk ) |
|---|
| Check the system for NFS mounts not using the "nosuid" option using command: # lsfs -v nfs Name Nodename Mount Pt VFS Size Options Auto Accounting /home/doej -- /mount/doej nfs 786432 -- yes no If the "mounted" file systems do not have the "nosuid option", this is a finding. |
| Fix Text (F-16406r294082_fix) |
|---|
| Edit "/etc/filesystems" and add the "nosuid" option for all NFS file systems. Remount the NFS file systems to make the change take effect. |