Primary authoritative name servers must be configured to only receive zone transfer requests from specified secondary name servers.
An XCCDF Rule
Description
<VulnDiscussion>Authoritative name servers (especially primary name servers) should be configured with an allow-transfer access control sub-statement designating the list of hosts from which zone transfer requests can be accepted. These restrictions address the denial-of-service threat and potential exploits from unrestricted dissemination of information about internal resources. Based on the need-to-know, the only name servers that need to refresh their zone files periodically are the secondary name servers. Zone transfer from primary name servers should be restricted to secondary name servers. The zone transfer should be completely disabled in the secondary name servers. The address match list argument for the allow-transfer sub-statement should consist of IP addresses of secondary name servers and stealth secondary name servers.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-233871r621666_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
1. Navigate to the Data Management >> DNS >> Zones tab.
2. Select the zone and click "Edit". Select the "Zone Transfers" tab and configure access control (ACL or Access Control Entries [ACE]) on each grid member that communicates with an external secondary.
3. When complete, click "Save & Close" to save the changes and exit the "Properties" screen.
4. Perform a service restart if necessary.