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V-240420

CAT II (Medium)

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

Rule ID

SV-240420r671001_rule

STIG

VMware vRealize Automation 7.x SLES Security Technical Implementation Guide

Version

V2R2

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 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