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RHEL-09-231090 RHEL 9 must prevent files with the setuid and setgid bit set from being executed on file systems that are used with removable media.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to CM-6 via CCI-000366

Title

RHEL 9 must prevent files with the setuid and setgid bit set from being executed on file systems that are used with removable media.

Control

Verify file systems that are used for removable media are mounted with the "nosuid" option with the following command: $ 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.

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-000366

Fix

Configure the "/etc/fstab" to use the "nosuid" option on file systems that are associated with removable media.