1.1.1.1 Ensure mounting of cramfs filesystems is disabled - modprobe

Information

The cramfs filesystem type is a compressed read-only Linux filesystem embedded in small footprint systems. A cramfs image can be used without having to first decompress the image.

Rationale:

Removing support for unneeded filesystem types reduces the local attack surface of the server. If this filesystem type is not needed, disable it.

Solution

Edit or create a file in the /etc/modprobe.d/ directory ending in .conf
Example: vim /etc/modprobe.d/cramfs.conf
and add the following line:

install cramfs /bin/true

Run the following command to unload the cramfs module:

# rmmod cramfs

See Also

https://workbench.cisecurity.org/files/3397

Item Details

Category: CONFIGURATION MANAGEMENT, SYSTEM AND SERVICES ACQUISITION

References: 800-53|CM-1, 800-53|CM-2, 800-53|CM-6, 800-53|CM-7, 800-53|CM-7(1), 800-53|CM-9, 800-53|SA-3, 800-53|SA-8, 800-53|SA-10, CSCv7|5.1

Plugin: Unix

Control ID: daf0959dca4e8bb49696a0b95c09b90ea8b829b07b5b42d5487744fcd90ed5e1