1.1.1.6 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 the file `/etc/modprobe.d/CIS.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/1863

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7b., CSCv6|13

Plugin: Unix

Control ID: dcebadf501e0d1f5fe0edf724e101d184c53467c14994f88e6dd27f42b15eb60