cyberstrikeus 2.24 Disable Mounting of udf Filesystems (Not Scored)
Profile Applicability
- Level 2
Description
The udf filesystem type is the universal disk format used to implement ISO/IEC 13346 and ECMA-167 specifications. This is an open vendor filesystem type for data storage on a broad range of media. This filesystem type is necessary to support writing DVDs and newer optical disc formats.
Rationale
Removing support for unneeded filesystem types reduces the local attack surface of the server. If this filesystem type is not needed, disable it.
Audit Procedure
Using Command Line
/sbin/modprobe -n -v udf
/sbin/lsmod | grep udf
Expected Result
The first command should output install /bin/true. The second command should produce no output (module not loaded).
Remediation
Using Command Line
Edit or create the file /etc/modprobe.d/CIS.conf and add the following line:
install udf /bin/true
Default Value
By default, the udf module is available for loading.
References
- CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
Profile
Level 2 - Not Scored