cis-bind-v100-8-6

name	cis-bind-v100-8-6
description	Ensure Full Digital Chain of Trust can be Validated (Automated)
category	cis-bind
version	1.0
author	cyberstrike-official
tags	["cis","bind","dns","isc-bind","bind9","dnssec"]
cis_id	8.6
cis_benchmark	CIS ISC BIND DNS Server 9.11 Benchmark v1.0.0
tech_stack	["bind","isc-bind","dns","linux"]
cwe_ids	["CWE-345"]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS 8.6 — Ensure Full Digital Chain of Trust can be Validated

Profile Applicability

• Authoritative Name Server Level 2

Description

For each authoritative domain ensure the digital signatures are is fully trusted starting from the root zone.

Rationale

In order for the the digital signatures to be trusted by other systems, The parent zone must be a DS (delegated signer) record that verifies the authenticity of he child zones KSK (key signing key). The delegated signature forms a chain of trust, delegated down from the root zone.

Impact

Not specified.

Audit Procedure

To audit the chain of trust use the delv command to query an external independent validating name server. Such as:

$ delv @8.8.8.8 cisecurity.org
; fully validated
cisecurity.org.21599   IN      A       10.1.2.3
cisecurity.org.21599   IN      RRSIG   A 8 2 43200 20200328213257
20200224211144 42363 cisecurity.org. gqTNFiJ. . .2n4Q==

The output of "fully validated" indicates the zone is compliant. Other answers are not compliant, and may include "no valid signature found" and "unsigned answer".

Remediation

If the zone has a valid signature but the signature is not trusted, the delegation from the parent zone, or the registrar may not be properly configured. Check with your parent zone administrator or with your name registrar's process to be sure the required information has been provided and that sufficient time has been allowed for new DS record to propagate. Each registrar may have slightly different processes. Generating a DS record from the KSK will liklkey provide some of the required information.

# dnssec-dsfromkey -a SHA-256 Kexample.com.+013+09798.key
example.com. IN DS 9798 13 2 D9AA106E44 . . .

Default Value

Not specified.

References

None listed in benchmark.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v7	N/A	N	N	N

MITRE ATT&CK Mappings

Tactic	Technique
Defense Evasion	T1562 Impair Defenses

Profile

• Level 2 - Authoritative Name Server