The BIND 9.x secondary name server must limit the total number of zones the name server can request at any one time.
An XCCDF Rule
Description
<VulnDiscussion>Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation. Name servers do not have direct user connections but accept client connections for queries. Original restriction on client connections should be high enough to prevent a self-imposed denial of service, after which the connections are monitored and fine-tuned to best meet the organization's specific requirements.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-207550r612253_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Edit the "named.conf" file.
Add the "transfers-in" sub statement to the "options" statement block.
The value of the "transfers-in" will be based on organizational requirements needed to support DNS operations.