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RHEL-10-700110 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).

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3 via CCI-000213

Title

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).

Control

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.

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.

Related controls

CCI-000213

Fix

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.