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Check: RHEL-09-231185

RHEL 9 STIG: RHEL-09-231185 (in versions v1 r3 through v1 r1)

Title

RHEL 9 must mount /var/tmp with the nosuid option. (Cat II impact)

Discussion

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.

Check Content

Verify "/var/tmp" is mounted with the "nosuid" option: $ mount | grep /var/tmp /dev/mapper/rhel-var-tmp on /var/tmp type xfs (rw,nodev,nosuid,noexec,seclabel) If the "/var/tmp" file system is mounted without the "nosuid" option, this is a finding.

Fix Text

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

Additional Identifiers

Rule ID: SV-257878r925621_rule

Vulnerability ID: V-257878

Group Title: SRG-OS-000368-GPOS-00154

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CCIs

CCIs tied to check.

Number	Definition
CCI-001764	The information system prevents program execution in accordance with organization-defined policies regarding software program usage and restrictions, and/or rules authorizing the terms and conditions of software program usage.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-7 (2)	Prevent Program Execution