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

From VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

Associated with: CCI-000382

SV-99153r1_rule The Datagram Congestion Control Protocol (DCCP) must be disabled unless required.

Vulnerability discussion

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.

Check content

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

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

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