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RHEL 8 must prevent files with the setuid and setgid bit set from being executed on file systems that are used with removable media.


Finding ID Version Rule ID IA Controls Severity
V-230305 RHEL-08-010620 SV-230305r627750_rule Medium
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.
Red Hat Enterprise Linux 8 Security Technical Implementation Guide 2022-06-15


Check Text ( C-32974r567661_chk )
Verify file systems that are used for removable media are mounted with the "nosuid" option with the following command:

$ sudo more /etc/fstab

UUID=2bc871e4-e2a3-4f29-9ece-3be60c835222 /mnt/usbflash vfat noauto,owner,ro,nosuid,nodev,noexec 0 0

If a file system found in "/etc/fstab" refers to removable media and it does not have the "nosuid" option set, this is a finding.
Fix Text (F-32949r567662_fix)
Configure the "/etc/fstab" to use the "nosuid" option on file systems that are associated with removable media.