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1.1.1.1 Ensure mounting of cramfs filesystems is disabled

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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.

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

and 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/benchmarks/8415

Item Details

References: CSCv7|5.1

Plugin: Unix

Control ID: b3121373ad2795934b3bee283547776a6fd41e2ad1f892275f5c674d6aff91d3