Details
The squashfs filesystem type is a compressed read-only Linux filesystem embedded in small footprint systems (similar to cramfs ). A squashfs image can be used without having to first decompress the image. Removing support for unneeded filesystem types reduces the local attack surface of the system. 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/squashfs.conf and add the following line: install squashfs /bin/true Run the following command to unload the squashfs module: # rmmod squashfs
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Unix.