1.1.1.6 Ensure mounting of squashfs filesystems is disabled - lsmod

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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.
Rationale:
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/2429

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7, CSCv6|13, CSCv7|13

Plugin: Unix

Control ID: 98bf670d284fd3b7d158b7d36ffa6d31a8d678de2d43a2de85589608985abe41