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1.1.1.1 Ensure mounting of cramfs filesystems is disabled - modprobe

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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.

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 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/files/3397

Item Details

References: CSCv7|5.1

Plugin: Unix

Control ID: d6f1a6d6f651654bfe0fe2519854238f3b0cab7273ad18aa47ba1565d10bf75b