The IAO/NSO will implement tcp intercept features provided by the router or implement a filter to rate limit tcp syn to protect servers from any TCP SYN flood attacks from an outside network.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3165	NET0960	SV-16143r1_rule	ECSC-1	Medium

Description
The TCP SYN attack involves transmitting a volume of connections that cannot be completed at the destination. This attack causes the connection queues to fill up, thereby denying service to legitimate TCP users.

STIG	Date
Perimeter L3 Switch Security Technical Implementation Guide - Cisco	2015-04-06

Details

Check Text ( C-3603r2_chk )
Review the device configuration to determine if TCP Intercept has been configured to mitigate TCP SYN Flood attacks. If TCP Intercept has not been implemented, this is a finding.

Fix Text (F-3190r2_fix)
Configure the device to use TCP Intercept to protect against TCP SYN attacks from outside the network.