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: /etc/modprobe.d/cramfs.conf
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/3152

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-11, CSCv6|3.1, CSCv7|2.6

Plugin: Unix

Control ID: 0a0c2629e44e737a8ac4047d1767b3f1d231a5af2e7136a811086bc679536b3b