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XCCDF
BIND 9.x Security Technical Implementation Guide
SRG-APP-000516-DNS-000109
The host running a BIND 9.X implementation must implement a set of firewall rules that restrict traffic on the DNS interface.
The host running a BIND 9.X implementation must implement a set of firewall rules that restrict traffic on the DNS interface.
An XCCDF Rule
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The host running a BIND 9.X implementation must implement a set of firewall rules that restrict traffic on the DNS interface.
Medium Severity
<VulnDiscussion>Configuring hosts that run a BIND 9.X implementation to only accept DNS traffic on a DNS interface allows a system firewall to be configured to limit the allowed incoming ports/protocols to 53/tcp and 53/udp. Sending outgoing DNS messages from a random port minimizes the risk of an attacker guessing the outgoing message port and sending forged replies. The TCP/IP stack in DNS hosts (stub resolver, caching/resolving/recursive name server, authoritative name server, etc.) could be subjected to packet flooding attacks (such as SYNC and smurf), resulting in disruption of communication. By implementing a specific set of firewall rules that limit accepted traffic to the interface, these risk of packet flooding and other TCP/IP based attacks is reduced.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>