Infoblox 7.x DNS Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-APP-000516-DNS-000084
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SRG-APP-000516-DNS-000085
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The Infoblox system must ensure each NS record in a zone file points to an active name server authoritative for the domain specified in that record.
Poorly constructed NS records pose a security risk because they create conditions under which an adversary might be able to provide the missing authoritative name services that are improperly speci...Rule Medium Severity -
SRG-APP-000516-DNS-000087
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All authoritative name servers for a zone must be located on different network segments.
Most enterprises have an authoritative primary server and a host of authoritative secondary name servers. It is essential that these authoritative name servers for an enterprise be located on diffe...Rule Medium Severity -
SRG-APP-000516-DNS-000089
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An authoritative name server must be configured to enable DNSSEC Resource Records.
The specification for a digital signature mechanism in the context of the DNS infrastructure is in IETF's DNSSEC standard. In DNSSEC, trust in the public key (for signature verification) of the sou...Rule Medium Severity -
SRG-APP-000516-DNS-000090
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SRG-APP-000516-DNS-000091
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For zones split between the external and internal sides of a network, the RRs for the external hosts must be separate from the RRs for the internal hosts.
Authoritative name servers for an enterprise may be configured to receive requests from both external and internal clients. External clients need to receive RRs that pertain only to public servic...Rule Medium Severity -
SRG-APP-000516-DNS-000092
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SRG-APP-000516-DNS-000093
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In a split DNS configuration, where separate name servers are used between the external and internal networks, the internal name server must be configured to not be reachable from outside resolvers.
Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two different sets of authoritative name servers. One set, called external ...Rule Medium Severity -
SRG-APP-000516-DNS-000099
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The DNS implementation must enforce a Discretionary Access Control (DAC) policy that limits propagation of access rights.
Discretionary Access Control (DAC) is based on the premise that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in whic...Rule Medium Severity -
The platform on which the name server software is hosted must be configured to send outgoing DNS messages from a random port.
OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Standards and Technology's (NIST's) National Vulnerability Database (NVD), ba...Rule Medium Severity -
SRG-APP-000516-DNS-000112
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SRG-APP-000516-DNS-000103
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The Infoblox NIOS version must be at the appropriate version.
Infoblox NIOS is updated on a regular basis to add feature support, implement bug fixes, and address security vulnerabilities. NIOS is a hardened system with no direct user access to the software c...Rule Medium Severity -
SRG-APP-000516-DNS-000108
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Node 2
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