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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-239516	VROM-SL-000485	SV-239516r661999_rule		Medium

Description
The Datagram Congestion Control Protocol (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 kernel to dynamically load a protocol handler by opening a socket using the protocol.

STIG	Date
VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide	2021-07-01

Details

Check Text ( C-42749r661997_chk )

Check that the DCCP protocol handler is prevented from dynamic loading: # grep "install dccp /bin/true" /etc/modprobe.conf /etc/modprobe.conf.local /etc/modprobe.d/* If no result is returned, this is a finding. # grep "install dccp_ipv4 /bin/true" /etc/modprobe.conf /etc/modprobe.conf.local /etc/modprobe.d/* 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-42708r661998_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