cyberstrikeus Ensure mounting of jffs2 filesystems is disabled
Description
The jffs2 (journaling flash filesystem 2) filesystem type is a log-structured filesystem used in flash memory devices.
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 jffs2 | grep -E '(jffs2|install)'
# lsmod | grep jffs2
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/jffs2.conf
# and add the following line:
install jffs2 /bin/true
# Run the following command to unload the jffs2 module:
rmmod jffs2
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