cyberstrikeus Ensure mounting of hfs filesystems is disabled
Description
The hfs filesystem type is a hierarchical filesystem that allows you to mount Mac OS filesystems.
Rationale
Removing support for unneeded filesystem types reduces the local attack surface of the system. If this filesystem type is not needed, disable it.
Impact
None noted.
Audit Procedure
Command Line
# modprobe -n -v hfs | grep -E '(hfs|install)'
# lsmod | grep hfs
Expected Result
install /bin/true
The lsmod command should return no output.
Remediation
Command Line
# Edit or create a file in the /etc/modprobe.d/ directory ending in .conf
# Example: vi /etc/modprobe.d/hfs.conf
# and add the following line:
install hfs /bin/true
# Run the following command to unload the hfs module:
rmmod hfs
Default Value
Not disabled by default.
References
- CIS Controls Version 7 - 5.1 Establish Secure Configurations: Maintain documented, standard security configuration standards for all authorized operating systems and software.
Profile
Level 1 - Server / Level 1 - Workstation, Assessment: Automated