The IPS must check inbound traffic to ensure that the communications are coming from an authorized source and routed to an authorized destination.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
SRG-NET-000195-IDPS-000203	SRG-NET-000195-IDPS-000203	SRG-NET-000195-IDPS-000203_rule		Medium

Description
Spoofing source addresses occurs when a malicious user outside the network has created packets with source address belonging to the private address space of the target network. This is done in an attempt to slip through perimeter as a member host to gain access to internal resources or to conceal identity to perform an attack. It is imperative that all inbound and outbound traffic with spoofed or invalid source addresses are blocked. If inbound traffic is not monitored to make sure source and destination of packets are authorized, then malicious users outside the network may be able to send packets to the private, trusted network.

Description

Spoofing source addresses occurs when a malicious user outside the network has created packets with source address belonging to the private address space of the target network. This is done in an attempt to slip through perimeter as a member host to gain access to internal resources or to conceal identity to perform an attack. It is imperative that all inbound and outbound traffic with spoofed or invalid source addresses are blocked. If inbound traffic is not monitored to make sure source and destination of packets are authorized, then malicious users outside the network may be able to send packets to the private, trusted network.

STIG	Date
IDPS Security Requirements Guide (SRG)	2012-03-08

Details

Check Text ( C-43360_chk )
Verify signatures or rules exist that monitor inbound traffic to ensure the communications are coming from an authorized source and routed to an authorized destination If rules do not exist to monitor inbound traffic to ensure that the communications are coming from an authorized source and routed to an authorized destination, this is a finding.

Fix Text (F-43360_fix)
Implement rules to monitor inbound traffic to ensure the communications are coming from an authorized source and routed to an authorized destination.