← Back to SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

V-22514

CAT II (Medium)

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

Rule ID

SV-45970r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000382

Discussion

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.

Check Content

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

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