TMA-FREEBSD-1.1.1.2
Ensure msdosfs kernel module is not available
MediumLevel 1Automatedfreebsd
Description
The msdosfs driver will permit the FreeBSD kernel to read and write MS-DOS based file systems. Removing support for unneeded file system types reduces the local attack surface of the system. This module is required only when reading or writing from MS-DOS based filesystems such as FAT16 or FAT32 file systems. Audit: `kldstat -q -m msdosfs` must report the module is not loaded.
How it is checked
Audit method: Shell command
shell
command -v kldstat >/dev/null 2>&1 || exit 1; kldstat -q -m msdosfs && echo "msdosfs kernel module is loaded" || echo compliant- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
kldunload -f msdosfs; printf 'msdosfs_load="NO"\n' >> /boot/loader.conf (remove any msdosfs_load="YES" and kld_list entry)
Properties
- Operating systems
- Any
- Tags
- freebsdhardening
- Reference
- CIS FreeBSD 14 Benchmark v1.0.1 - 1.1.1.2 Ensure msdosfs kernel module is not available
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
shell
tmaegis scan --target freebsd