1.1.1.3 Ensure mounting of squashfs filesystems is disabled - lsmod

Information

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

See Also

https://workbench.cisecurity.org/files/2518

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7, CSCv7|5.1

Plugin: Unix

Control ID: c46076515dd228a8acccc7aaad2ab827324872cc17a5bc0f020922f6ad45435e