3.5.2 Ensure SCTP is disabled (Not Scored)

Level 1 - Server
Level 1 - Workstation 

The Stream Control Transmission Protocol (SCTP) is a transport layer protocol used to support message oriented communication, with several streams of messages in one connection. It serves a similar function as TCP and UDP, incorporating features of both. It is message-oriented like UDP, and ensures reliable in-sequence transport of messages with congestion control like TCP.

If the protocol is not being used, it is recommended that kernel module not be loaded, disabling the service to reduce the potential attack surface.

Run the following commands and verify the output is as indicated:

# modprobe -n -v sctp
install /bin/true 
# lsmod | grep sctp
<No output>

Edit or create the file /etc/modprobe.d/CIS.conf and add the following line:

install sctp /bin/true