AlmaLinux OS 9 must disable mounting of udf.
An XCCDF Rule
Description
Removing support for unneeded filesystem types reduces the local attack surface of the server. The UDF filesystem is used to write DVDs and so could assist in data exfiltration, the so-called "sneakernet". Note that Microsoft Azure uses UDF.
- ID
- SV-269348r1050230_rule
- Version
- ALMA-09-030380
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
To configure the system to prevent the udf kernel module from being loaded, create a *.conf file in /etc/modprobe.d/ with the following content:
install udf /bin/false
blacklist udf