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The BIND 9.x server private key corresponding to the zone-signing key (ZSK) pair must be the only DNSSEC key kept on a name server that supports dynamic updates.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-272372BIND-9X-001140SV-272372r1123853_ruleCCI-000186medium
Description
The private key in the ZSK key pair must be protected from unauthorized access. If possible, the private key should be stored offline (with respect to the internet-facing, DNSSEC-aware name server) in a physically secure, nonnetwork-accessible machine along with the zone file primary copy. This strategy is not feasible in situations in which the DNSSEC-aware name server has to support dynamic updates. To support dynamic update transactions, the DNSSEC-aware name server (which usually is a primary authoritative name server) has to have both the zone file primary copy and the private key corresponding to the zone-signing key (ZSK-private) online to immediately update the signatures for the updated RRsets. Failure to protect the private ZSK opens it to being maliciously obtained and opens the DNS zone to being populated with invalid data. The integrity of the DNS zone would be compromised, leading to a loss of trust whether a DNS response has originated from an authentic source, the response is complete and has not been tampered with during transit.
STIGDate
BIND 9.x Security Technical Implementation Guide2026-02-25

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

IAC-10.2PKI-Based Authentication
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (55) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-10Concurrent Session Control
1.00
AC-12Session Termination
1.00
AC-17(10)Authenticate Remote Commands
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(4)Discretionary Access Control
1.00

+45 more (top 10 by confidence shown)

CCI1 mapping
CCI-000186
1.00

Details

Check Text (C-272372r1123853_chk)

Verify that the ZSK private key is the only key stored on the name server. For each signed zone file, identify the ZSK "key id" number: # cat <signed_zone_file> | grep -i "zsk" ZSK; alg = ECDSAP256SHA256; key id = 22335 Using the ZSK "key id", verify that the only private key stored on the system matches the "key id". Kexample.com.+008+22335.private If any ZSK private keys exist on the server other than the one corresponding to the active ZSK pair, this is a finding.

Fix Text (F-76329r1123428_fix)

Remove any ZSK private keys existing on the server other than the one corresponding to the active ZSK pair.