OL 8 must not have the stream control transmission protocol (SCTP) kernel module installed if not required for operational support.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-248831	OL08-00-040023	SV-248831r780059_rule		Medium

Description
The SCTP is a transport layer protocol, designed to support the idea of message-oriented communication, with several streams of messages within one connection. Disabling SCTP protects the system against exploitation of any flaws in its implementation.

STIG	Date
Oracle Linux 8 Security Technical Implementation Guide	2023-03-06

Details

Check Text ( C-52265r780057_chk )
Verify the operating system disables the ability to load the "sctp" kernel module. $ sudo grep -r sctp /etc/modprobe.d/* \| grep -i "/bin/false" \| grep -v "^#" install sctp /bin/true If the command does not return any output or the line is commented out, and use of SCTP 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 SCTP with the following command: $ sudo grep sctp /etc/modprobe.d/* \| grep -i "blacklist" \| grep -v "^#" blacklist sctp If the command does not return any output or the output is not "blacklist sctp", and use of SCTP is not documented with the ISSO as an operational requirement, this is a finding.

Check Text ( C-52265r780057_chk )

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

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

install sctp /bin/true

If the command does not return any output or the line is commented out, and use of SCTP 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 SCTP with the following command:

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

blacklist sctp

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

Fix Text (F-52219r780058_fix)
Configure OL 8 to disable the ability to use the "sctp" kernel module. Create a file under "/etc/modprobe.d" with the following command: $ sudo touch /etc/modprobe.d/sctp.conf Add the following line to the created file: install sctp /bin/true Configure OL 8 to disable the ability to use the sctp kernel module. $ sudo vi /etc/modprobe.d/blacklist.conf Add or update the line: blacklist sctp