InformationThe 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).
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.
SolutionConfigure 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
This Benchmark recommendation maps to:
Red Hat Enterprise Linux 7 Security Technical Implementation Guide:
Version 2, Release: 3 Benchmark Date: 26 Apr 2019
Vul ID: V-72045
Rule ID: SV-86669r2_rule
STIG ID: RHEL-07-021020
Severity: CAT II