The Datagram Congestion Control Protocol (DCCP) must be disabled unless required.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22514	GEN007080	SV-45970r1_rule		Medium

Description
The DCCP is a proposed transport layer protocol. This protocol is not yet widely used. Binding this protocol to the network stack increases the attack surface of the host. Unprivileged local processes may be able to cause the system to dynamically load a protocol handler by opening a socket using the protocol.

STIG	Date
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-43252r1_chk )

Verify the DCCP protocol handler is prevented from dynamic loading. # grep 'install dccp' /etc/modprobe.conf /etc/modprobe.conf.local /etc/modprobe.d/* | grep ‘/bin/true’ If no result is returned, this is a finding. # grep 'install dccp_ipv4' /etc/modprobe.conf /etc/modprobe.conf.local /etc/modprobe.d/* | grep /bin/true’ If no result is returned, this is a finding. # grep 'install dccp_ipv6' /etc/modprobe.conf /etc/modprobe.conf.local /etc/modprobe.d/* | grep ‘bin/true’ If no result is returned, this is a finding.

Fix Text (F-39335r1_fix)
Prevent the DCCP protocol handler for dynamic loading. # echo "install dccp /bin/true" >> /etc/modprobe.conf.local # echo "install dccp_ipv4 /bin/true" >> /etc/modprobe.conf.local # echo "install dccp_ipv6 /bin/true" >> /etc/modprobe.conf.local