cis-ubuntu1604-v200-3-4-2

name	cis-ubuntu1604-v200-3-4-2
description	Ensure SCTP is disabled
category	cis-networking
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","networking"]
cis_id	3.4.2
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 3.4.2

Description

The Stream Control Transmission Protocol (SCTP) is a transport layer protocol used to support message oriented communication, with several streams of messages in one connection. It serves a similar function as TCP and UDP, incorporating features of both. It is message-oriented like UDP, and ensures reliable in-sequence transport of messages with congestion control like TCP.

Rationale

If the protocol is not being used, it is recommended that kernel module not be loaded, disabling the service to reduce the potential attack surface.

Impact

None.

Audit Procedure

Command Line

Run the following commands and verify the output is as indicated:

modprobe -n -v sctp | grep -E '(sctp|install)'

lsmod | grep sctp

Expected Result

install /bin/true

The lsmod command should return no output.

Remediation

Command Line

Edit or create a file in the /etc/modprobe.d/ directory ending in .conf

Example: vi /etc/modprobe.d/sctp.conf

and add the following line:

install sctp /bin/true

Default Value

SCTP module is available but typically not loaded by default.

References

1. CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0

CIS Controls

Version 7

9.2 Ensure Only Approved Ports, Protocols and Services Are Running - Ensure that only network ports, protocols, and services listening on a system with validated business needs, are running on each system.

Profile Applicability

• Level 2 - Server
• Level 2 - Workstation

Assessment Status

Automated