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V-281230

CAT II (Medium)

RHEL 10 must prevent files with the "setuid" and "setgid" bit set from being executed on file systems that are imported via Network File System (NFS).

Rule ID

SV-281230r1166642_rule

STIG

Red Hat Enterprise Linux 10 Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000213

Discussion

The "nosuid" mount option causes the system not to 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 nonprivileged users to attain unauthorized administrative access.

Check Content

Note: If no NFS mounts are configured, this requirement is not applicable.

Verify RHEL 10 has the "nosuid" option configured for all NFS mounts with the following command:

$ sudo grep nfs /etc/fstab
192.168.22.2:/mnt/export /data nfs4 rw,nosuid,nodev,noexec,sync,soft,sec=krb5:krb5i:krb5p

If the system is mounting file systems via NFS and the "nosuid" option is missing, this is a finding.

Fix Text

Configure RHEL 10 to prevent files with the "setuid" and "setgid" bit set from being executed on file systems that are imported via NFS.

Update each NFS mounted file system to use the "nosuid" option on file systems that are being imported via NFS.