The nosuid option must be enabled on all Network File System (NFS) client mounts.

From Oracle Linux 5 Security Technical Implementation Guide

Associated with: CCI-000225

SV-64147r1_rule The nosuid option must be enabled on all Network File System (NFS) client mounts.

Vulnerability discussion

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.

Check content

Check the system for NFS mounts not using the "nosuid" option. Procedure: # mount -v | grep " type nfs " | egrep -v "nosuid" If the mounted file systems do not have the "nosuid" option, this is a finding.

Fix text

Edit "/etc/fstab" and add the "nosuid" option for all NFS file systems. Remount the NFS file systems to make the change take effect.

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