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The secondary name servers in a BIND 9.x implementation must be configured to initiate zone update notifications to other authoritative zone name servers.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-272393BIND-9X-001370SV-272393r1124048_ruleCCI-000366medium
Description
It is important to maintain the integrity of a zone file. The serial number of the SOA record is used to indicate to secondary name server that a change to the zone has occurred and a zone transfer should be performed. The serial number used in the SOA record provides the DNS administrator a method to verify the integrity of the zone file based on the serial number of the last update and ensure that all secondary servers are using the correct zone file. When a primary name server notices that the serial number of a zone has changed, it sends a special announcement to all of the secondary name servers for that zone. The primary name server determines which servers are the secondaries for the zone by looking at the list of NS records in the zone and taking out the record that points to the name server listed in the MNAME field of the zone's SOA record as well as the domain name of the local host. When a secondary name server receives a NOTIFY announcement for a zone from one of its configured primary name servers, it responds with a NOTIFY response. The response tells the primary that the secondary received the NOTIFY announcement so that the primary can stop sending it NOTIFY announcements for the zone. Then the secondary proceeds just as if the refresh timer for that zone had expired: it queries the primary name server for the SOA record for the zone that the primary claims has changed. If the serial number is higher, the secondary transfers the zone. The secondary should next issue its own NOTIFY announcements to the other authoritative name servers for the zone. The idea is that the primary may not be able to notify all of the secondary name servers for the zone itself, since it is possible some secondaries cannot communicate directly with the primary (they use another secondary as their primary). Older BIND 8 secondaries do not send NOTIFY messages unless explicitly configured to do so.
STIGDate
BIND 9.x Security Technical Implementation Guide2026-02-25

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (8) 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.

CFG-01Configuration Management Program
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
MON-01Continuous Monitoring
1.00
MON-01.7File Integrity Monitoring (FIM)
1.00
CFG-02Secure Baseline Configurations
0.50
CFG-02.7Approved Configuration Deviations
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (100) 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-12Session Termination
1.00
AC-16(1)Dynamic Attribute Association
1.00
AC-17(1)Monitoring and Control
1.00
AC-2Account Management
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-24(1)Transmit Access Authorization Information
1.00
AC-25Reference Monitor
1.00

+90 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (2) 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.

3.4.1
1.00
3.4.2
1.00
CCI1 mapping
CCI-000366
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (5) 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.

DE.CM-09
1.00
PR.PS-01
1.00
PR.DS-10
0.50
PR.PSPlatform Security
0.50
PR.PS-05
0.50

Who does this work

10 NICE work roles and 9 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-272393r1124048_chk)

If this is a primary name server, this is not applicable. On a secondary name server, verify that the global notify is disabled. The global entry for the name server is under the "Options" section, and notify must be disabled at this section. Inspect the "named.conf" file for the following: options { notify no; }; If the "notify" statement is missing, this is a finding. If the "notify" statement is set to "yes", this is a finding. Verify that zones for which the secondary server is authoritative are configured to notify other authorized secondary name servers when a zone file update has been received from the primary name server for the zone. Each zone has its own zone section. Inspect the "named.conf" file for the following: zone example.com { notify explicit; also-notify { <ip_address>; | <address_match_list>; }; If an "address match list" is used, verify that each IP address listed is an authorized secondary name server for that zone. If the "notify explicit" statement is missing, this is a finding. If the "also-notify" statement is missing, this is a finding. If the "also-notify" statement is configured to notify name servers that are not authorized for that zone, this is a finding.

Fix Text (F-76350r1123896_fix)

Edit the "named.conf" file. Configure the "notify" sub-statement in the "options" statement block to "no": options { notify no; }; Configure the "notify explicit" and "also-notify" sub-statements in the zone statement block to limit zone transfer notifications to authorized secondary name servers: zone example.com { notify explicit; also-notify { <ip_address>; | <address_match_list>; }; Restart the BIND 9.x process.