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The noexec option must be added to removable media partitions.


Finding ID Version Rule ID IA Controls Severity
V-218023 RHEL-06-000271 SV-218023r505923_rule Low
Allowing users to execute binaries from removable media such as USB keys exposes the system to potential compromise.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-09-03


Check Text ( C-19504r377084_chk )
Identify any removable media that is configured on the system:

# cat /etc/fstab

/dev/mapper/vg_rhel6-lv_root / ext4 defaults 1 1
UUID=0be9b205-f8e6-4bf4-b0ba-1f235fc55936 /boot ext4 defaults 1 2
UUID=5D49-30B2 /boot/efi vfat umask=0077,shortname=winnt 0 0
/dev/mapper/vg_rhel6-lv_home /home ext4 defaults 1 2
/dev/mapper/vg_rhel6-lv_tmp /tmp ext4 defaults 1 2
/dev/mapper/vg_rhel6-lv_var /var ext4 defaults 1 2
/dev/mapper/vg_rhel6-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/sdc1 /media/usb vfat defaults,rw,noexec 0 0

If any of the identified removable media devices do not have "noexec" defined, this is a finding.
Fix Text (F-19502r377085_fix)
The "noexec" mount option prevents the direct execution of binaries on the mounted filesystem. Users should not be allowed to execute binaries that exist on partitions mounted from removable media (such as a USB key). The "noexec" option prevents code from being executed directly from the media itself, and may therefore provide a line of defense against certain types of worms or malicious code. Add the "noexec" option to the fourth column of "/etc/fstab" for the line which controls mounting of any removable media partitions.