Network devices must have DNS servers defined if it is configured as a client resolver.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3020	NET0820	SV-3020r3_rule		Low

Description
The susceptibility of IP addresses to spoofing translates to DNS host name and IP address mapping vulnerabilities. For example, suppose a source host wishes to establish a connection with a destination host and queries a DNS server for the IP address of the destination host name. If the response to this query is the IP address of a host operated by an attacker, the source host will establish a connection with the attacker's host, rather than the intended target. The user on the source host might then provide logon, authentication, and other sensitive data.

Description

The susceptibility of IP addresses to spoofing translates to DNS host name and IP address mapping vulnerabilities. For example, suppose a source host wishes to establish a connection with a destination host and queries a DNS server for the IP address of the destination host name. If the response to this query is the IP address of a host operated by an attacker, the source host will establish a connection with the attacker's host, rather than the intended target. The user on the source host might then provide logon, authentication, and other sensitive data.

STIG	Date
Firewall Security Technical Implementation Guide	2017-06-27

Details

Check Text ( C-3584r5_chk )
Review the device configuration to ensure DNS servers have been defined if it has been configured as a client resolver (name lookup). If the device is configured as a client resolver and DNS servers are not defined, this is a finding.

Fix Text (F-3045r2_fix)
Configure the device to include DNS servers or disable domain lookup.