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V-230308

CAT II (Medium)

RHEL 8 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-230308r1155390_rule

STIG

Red Hat Enterprise Linux 8 Security Technical Implementation Guide

Version

V2R7

CCIs

CCI-000366

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 unprivileged users to attain unauthorized administrative access.

Check Content

Note: If no NFS mounts are configured, this requirement is Not Applicable.

Verify file systems being imported via NFS are mounted with the "nosuid" option with the following command:

$ sudo grep nfs /etc/fstab | grep nosuid

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

If a file system found in "/etc/fstab" refers to NFS and it does not have the "nosuid" option set, this is a finding.

Fix Text

Configure the "/etc/fstab" to use the "nosuid" option on file systems that are being imported via NFS.