cis-bind-v100-7-2

DevOps & Security

Enable DNSSEC Validation (Automated)

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CIS 7.2 — Enable DNSSEC Validation

Profile Applicability

Caching Only Name Server Level 1
Authoritative Name Server Level 1

Description

DNS Security Extensions or DNSSEC for short provides authentication of the name servers through public key cryptography. With DNSSEC, the name server signs its responses with its private key. This allows other name servers that have the public key of the name server to verify the integrity and authenticity of the response. DNSSEC also provides for signing of public keys so that delegated sub-domains may have their keys signed by a higher-level authority. This creates a chain of trust so that any name server that trusts the public key of the higher-level signing authority can trust the signed key. It is recommended that DNSSEC be enabled and be configured to validate domains that are signed. DNSSEC and validation are enabled via the options dnssec-enable and dnssec-validation, respectively.

Rationale

DNSSEC reliably authenticates DNS responses to prevent the DNS spoofing and cache poisoning attacks.

Impact

Not specified in the PDF.

Audit Procedure

Perform the following to verify compliance.

To verify that the name server will validate the trust for DNSSEC signed domains, perform the following delv command on the name server. The command queries the name isc.org, which has a valid trusted DNSSEC signature.

$ delv @127.0.0.1 isc.org
; fully validated
isc.org.        60     IN     A     149.20.1.66
isc.org.        60     IN     RRSIG A 13 2 60 20200306020506
20200205011018 27566 isc.org.
VxlTxZDll9boCOG2jE+gt7w3memCLyyCd+thrwf5XRrKkrCjcJWL7cd0y82Pv5FHKqhgq4b
BKJOR4uNhUhWDg==

The compliant result should have ; fully validated as the initial response indicating the recursive server is DNSSEC aware.

To verify that the name server will properly reject DNSSEC signed domains with an invalid signature, perform the dig command below on the www.dnssec-failed.org name.

$ delv @127.0.0.1 www.dnssec-failed.org
;; resolution failed: SERVFAIL

The status value should be resolution failed: SERVFAIL.

Remediation

Perform the following for remediation:

Check the BIND configuration files, and in the global options set the option dnssec-enable to yes, and option dnssec-validation to either yes or auto as shown below. The auto setting is generally preferred as the trust anchor will not need to be manually configured.

dnssec-enable yes
dnssec-validation auto

Restart the named server.

Default Value

DNSSEC and DNSSEC validation are enabled by default.

References

https://kb.isc.org/docs/aa-01182

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v6	9 Limitation and Control of Network Ports, Protocols, and Services	Y	Y	Y
v7	16.4 Encrypt or Hash all Authentication Credentials	N	Y	Y

MITRE ATT&CK Mappings

Tactic	Technique
Credential Access	T1557 - Adversary-in-the-Middle
Command and Control	T1071.004 - Application Layer Protocol: DNS
Defense Evasion	T1556 - Modify Authentication Process

Profile

Level 1 - Caching Only Name Server
Level 1 - Authoritative Name Server