AlmaLinux OS 9 must mount /var/tmp with the nosuid option.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-269329	ALMA-09-028180	SV-269329r1050211_rule		Medium

Description

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 nonprivileged users to attain unauthorized administrative access.

STIG	Date
CloudLinux AlmaLinux OS 9 Security Technical Implementation Guide	2025-05-22

Details

Check Text (C-73360r1048363_chk)

Verify "/var/tmp" is mounted with the "nosuid" option:

$ mount | grep /var/tmp

/dev/mapper/luks-0e7206e7-bfb1-4a23-ae14-b9cea7cf76d5 on /var/tmp type xfs (rw,nosuid,nodev,noexec,relatime,seclabel,attr2,inode64,logbufs=8,logbsize=32k,noquota)

If the "/var/tmp" file system is mounted without the "nosuid" option, this is a finding.

Fix Text (F-73261r1048364_fix)

Modify "/etc/fstab" to use the "nosuid" option on the "/var/tmp" directory.