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Domain Name System (DNS) Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-APP-000516

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  • The DNS Name Server software must run with restricted privileges.

    &lt;VulnDiscussion&gt;Failure to provide logical access restrictions associated with changes to application configuration may have significant effe...
    Rule Medium Severity
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  • SRG-APP-000516

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  • In a split DNS configuration, where separate name servers are used between the external and internal networks, the external name server must be configured to not be reachable from inside resolvers.

    &lt;VulnDiscussion&gt;Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two d...
    Rule Medium Severity
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  • SRG-APP-000516

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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.

    &lt;VulnDiscussion&gt;Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two d...
    Rule Medium Severity
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  • SRG-APP-000516

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  • Primary authoritative name servers must be configured to only receive zone transfer requests from specified secondary name servers.

    &lt;VulnDiscussion&gt;Authoritative name servers (especially primary name servers) should be configured with an allow-transfer access control subst...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS implementation must be conformant to the IETF DNS specification.

    &lt;VulnDiscussion&gt;Any DNS implementation must be designed to be able to conform to the Internet Engineering Task Force (IETF) specification. Do...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The IP address for hidden master authoritative name servers must not appear in the name servers set in the zone database.

    &lt;VulnDiscussion&gt;A hidden master authoritative server is an authoritative DNS server whose IP address does not appear in the name server set f...
    Rule Medium Severity
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  • SRG-APP-000516

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  • SRG-APP-000700

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  • The DNS server implementation must disable accounts when the accounts have expired.

    &lt;VulnDiscussion&gt;Disabling expired, inactive, or otherwise anomalous accounts supports the concepts of least privilege and least functionality...
    Rule Medium Severity
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  • SRG-APP-000705

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  • The DNS implementation must enforce a Discretionary Access Control (DAC) policy that limits propagation of access rights.

    &lt;VulnDiscussion&gt;Discretionary Access Control (DAC) is based on the premise that individual users are "owners" of objects and therefore have d...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS implementation must implement internal/external role separation.

    &lt;VulnDiscussion&gt;DNS servers with an internal role only process name/address resolution requests from within the organization (i.e., internal ...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS must utilize valid root name servers in the local root zone file.

    &lt;VulnDiscussion&gt;All caching name servers must be authoritative for the root zone because, without this starting point, they would have no kno...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS name server software must be at the latest version.

    &lt;VulnDiscussion&gt;Each newer version of the name server software, especially the BIND software, generally is devoid of vulnerabilities found in...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS server implementation must disable accounts when the accounts are no longer associated to a user.

    &lt;VulnDiscussion&gt;Disabling expired, inactive, or otherwise anomalous accounts supports the concepts of least privilege and least functionality...
    Rule Medium Severity
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  • SRG-APP-000745

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  • The platform on which the name server software is hosted must be configured to respond to DNS traffic only.

    &lt;VulnDiscussion&gt;OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Stand...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The platform on which the name server software is hosted must be configured to send outgoing DNS messages from a random port.

    &lt;VulnDiscussion&gt;OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Stand...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The private key corresponding to the ZSK, stored on name servers accepting dynamic updates, must have appropriate directory/file-level access control list-based or cryptography-based protections.

    &lt;VulnDiscussion&gt;The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys shoul...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The private keys corresponding to both the ZSK and the KSK must not be kept on the DNSSEC-aware primary authoritative name server when the name server does not support dynamic updates.

    &lt;VulnDiscussion&gt;The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys shoul...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS server implementation must implement the capability to centrally review and analyze audit records from multiple components within the system.

    &lt;VulnDiscussion&gt;Automated mechanisms for centralized reviews and analyses include Security Information and Event Management products.&lt;/Vul...
    Rule Medium Severity
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  • SRG-APP-000795

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  • SRG-APP-000915

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  • A zone file must not include resource records that resolve to a fully qualified domain name residing in another zone.

    &lt;VulnDiscussion&gt;If a name server were able to claim authority for a resource record in a domain for which it was not authoritative, this woul...
    Rule Medium Severity
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  • SRG-APP-000516

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  • CNAME records must not point to a zone with lesser security for more than six months.

    &lt;VulnDiscussion&gt;The use of CNAME records for exercises, tests, or zone-spanning aliases should be temporary (e.g., to facilitate a migration)...
    Rule Medium Severity
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  • SRG-APP-000516

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  • The DNS server implementation must be configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs.

    &lt;VulnDiscussion&gt;Configuration settings are the set of parameters that can be changed that affect the security posture and/or functionality of...
    Rule Medium Severity
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  • SRG-APP-000516

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  • A unique TSIG key must be generated for each pair of communicating hosts.

    &lt;VulnDiscussion&gt;To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...
    Rule Medium Severity
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  • SRG-APP-000516

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  • All authoritative name servers for a zone must be geographically disbursed.

    &lt;VulnDiscussion&gt;In addition to network-based dispersion, authoritative name servers should be dispersed geographically as well. In other word...
    Rule Medium Severity
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  • The DNS server implementation must alert organization-defined personnel or roles upon detection of unauthorized access, modification, or deletion of audit information.

    &lt;VulnDiscussion&gt;Audit information includes all information needed to successfully audit system activity, such as audit records, audit log set...
    Rule Medium Severity
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  • SRG-APP-000805

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  • The DNS server implementation must automatically generate audit records of the enforcement actions.

    &lt;VulnDiscussion&gt;Organizations log system accesses associated with applying configuration changes to ensure that configuration change control ...
    Rule Medium Severity
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  • SRG-APP-000810

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