cis-bind-v100-8-5

DevOps & Security

Ensure each Zone has a Valid Digital Signature (Manual)

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CIS 8.5 — Ensure each Zone has a Valid Digital Signature

Profile Applicability

Authoritative Name Server Level 2

Description

For each zone of the authoritative name server, verify that the signed zone file has a valid signature for each algorithm in the zone DNSKEY RRSet.

Rationale

The zone must have a valid signature before it can be trusted by validating DNSSEC name resolvers.

Impact

Not specified.

Audit Procedure

Perform the following command on each zone providing the signed zone file. The example file name is 'cisecurity.org.signed' for the domain cisecurity.org. If the signed zone file is not generated from inline signing, then the format may be ASCII, and the -I raw should be omitted.

# dnssec-verify -I raw -o cisecurity.org cisecurity.org.signed
Loading zone 'cisecurity.org' from file 'cisecurity.org.signed'
Verifying the zone using the following algorithms: ECDSAP256SHA256.
Zone fully signed:
Algorithm: ECDSAP256SHA256: KSKs: 1 active, 0 stand-by, 0 revoked
                            ZSKs: 1 active, 0 stand-by, 0 revoked

The compliant output will include the string Zone fully signed:.

Remediation

Perform either of the following:

Enable in-line signing in each zone configuration by setting inline-signing to yes value. For example:

zone "cisecurity.org" {
      type master;
      file "/etc/named/masters/cisecurity.org";
      key-directory "/etc/named/keys";
      inline-signing yes;
      auto-dnssec maintain;
};

Reload the server configuration and zones.

rndc reload

Or if using manual or scripted zone signing instead of inline-signing, then perform the following.

Include the signing keys at the end of the zone file to be signed. Such as:

$include Kcisecurity.com.+013+09768.key
$include Kcisecurity.com.+013+45248.key

Then sign each zone file with the dnssec-signzone command such as:

dnssec-signzone -o cisecurity.com ../masters/cisecurity.com
Kcisecurity.com.+013+09768.key Kcisecurity.com.+013+45248.key

Reload the configuration and zones.

rndc reload

Default Value

Not specified.

References

None listed in benchmark.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v7	16.4 Encrypt or Hash all Authentication Credentials	N	Y	Y

MITRE ATT&CK Mappings

Tactic	Technique
Defense Evasion	T1562 Impair Defenses

Profile

Level 2 - Authoritative Name Server