Details

The operating system must prevent files with the setuid and setgid bit set from being executed on file systems that are being imported via Network File System (NFS).

Rationale:

The ‘nosuid’ mount option causes the system to not execute ‘setuid’ and ‘setgid’ files with owner privileges. This option must be used for mounting any file system not containing approved ‘setuid’ and ‘setguid’ files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.

Solution

Configure the /etc/fstab to use the nosuid option on file systems that are being imported via NFS.
Example: vim /etc/fstab
Add, uncomment or update the NFS file systems identified in the Audit:

UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,nosuid 0 0

Supportive Information

The following resource is also helpful.

• https://workbench.cisecurity.org/files/3636

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Unix.

References

• 800-53|CM-6b.
• CCI|CCI-000366
• CSCv6|3.1
• CSCv7|14.6
• Rule-ID|SV-204482r603261_rule
• STIG-ID|RHEL-07-021020

Source

• Tenable.com/audits