OL 8 must not have the asynchronous transfer mode (ATM) kernel module installed if not required for operational support.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-248829	OL08-00-040021	SV-248829r943071_rule		Medium

Description
The ATM is a transport layer protocol designed for digital transmission of multiple types of traffic, including telephony (voice), data, and video signals, in one network without the use of separate overlay networks. Disabling ATM protects the system against exploitation of any flaws in its implementation.

STIG	Date
Oracle Linux 8 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-52263r943069_chk )
Verify the operating system disables the ability to load the "atm" kernel module. $ sudo grep -r atm /etc/modprobe.d/* \| grep -i "/bin/false" \| grep -v "^#" install atm /bin/false If the command does not return any output or the line is commented out, and use of ATM is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding. Verify the operating system disables the ability to use ATM with the following command: $ sudo grep atm /etc/modprobe.d/* \| grep -i "blacklist" \| grep -v "^#" blacklist atm If the command does not return any output or the output is not "blacklist atm", and use of ATM is not documented with the ISSO as an operational requirement, this is a finding.

Check Text ( C-52263r943069_chk )

Verify the operating system disables the ability to load the "atm" kernel module.

$ sudo grep -r atm /etc/modprobe.d/* | grep -i "/bin/false" | grep -v "^#"
install atm /bin/false

If the command does not return any output or the line is commented out, and use of ATM is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Verify the operating system disables the ability to use ATM with the following command:

$ sudo grep atm /etc/modprobe.d/* | grep -i "blacklist" | grep -v "^#"
blacklist atm

If the command does not return any output or the output is not "blacklist atm", and use of ATM is not documented with the ISSO as an operational requirement, this is a finding.

Fix Text (F-52217r943070_fix)
Configure OL 8 to disable the ability to use the "atm" kernel module. Create a file under "/etc/modprobe.d" with the following command: $ sudo touch /etc/modprobe.d/atm.conf Add the following line to the created file: install atm /bin/false Configure OL 8 to disable the ability to use the atm kernel module. $ sudo vi /etc/modprobe.d/blacklist.conf Add or update the line: blacklist atm