t1599-001-network-address-translation-traversal

name	T1599.001_network-address-translation-traversal
description	Adversaries may bridge network boundaries by modifying a network device’s Network Address Translation (NAT) configuration.
category	configuration
version	18.1
author	cyberstrike-official
tags	["mitre-attack","enterprise","t1599.001","defense-evasion","network-devices","sub-technique"]
technique_id	T1599.001
tactic	defense-evasion
all_tactics	["defense-evasion"]
platforms	["Network Devices"]
mitre_url	https://attack.mitre.org/techniques/T1599/001
tech_stack	["network devices"]
cwe_ids	["CWE-693"]
chains_with	["T1599"]
prerequisites	["T1599"]
severity_boost	{"T1599":"Chain with T1599 for deeper attack path"}

T1599.001 Network Address Translation Traversal

Sub-technique of: T1599

High-Level Description

Adversaries may bridge network boundaries by modifying a network device’s Network Address Translation (NAT) configuration. Malicious modifications to NAT may enable an adversary to bypass restrictions on traffic routing that otherwise separate trusted and untrusted networks.

Network devices such as routers and firewalls that connect multiple networks together may implement NAT during the process of passing packets between networks. When performing NAT, the network device will rewrite the source and/or destination addresses of the IP address header. Some network designs require NAT for the packets to cross the border device. A typical example of this is environments where internal networks make use of non-Internet routable addresses.

When an adversary gains control of a network boundary device, they may modify NAT configurations to send traffic between two separated networks, or to obscure their activities. In network designs that require NAT to function, such modifications enable the adversary to overcome inherent routing limitations that would normally prevent them from accessing protected systems behind the border device. In network designs that do not require NAT, adversaries may use address translation to further obscure their activities, as changing the addresses of packets that traverse a network boundary device can make monitoring data transmissions more challenging for defenders.

Adversaries may use Patch System Image to change the operating system of a network device, implementing their own custom NAT mechanisms to further obscure their activities.

Kill Chain Phase

• Defense Evasion (TA0005)

Platforms: Network Devices

What to Check

• Identify if Network Address Translation Traversal technique is applicable to target environment
• Check Network Devices systems for indicators of Network Address Translation Traversal
• Verify mitigations are bypassed or absent (5 known mitigations)
• Assess detection coverage (1 detection strategies)

How to Test

Manual Testing

1. Identify Attack Surface: Determine if the target environment is susceptible to Network Address Translation Traversal by examining the target platforms (Network Devices).

2. Assess Existing Defenses: Review whether mitigations for T1599.001 are in place. If defenses are absent or misconfigured, this technique may be exploitable.