Details

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 the file /etc/modprobe.d/CIS.conf and add the following line-install cramfs /bin/true

Supportive Information

The following resource is also helpful.

• https://workbench.cisecurity.org/files/91

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.

References

• 800-53|CM-6b.
• CSCv6|3.1

Source

• Tenable.com/audits