II - Mission Support Public
Rules and Groups employed by this XCCDF Profile
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SRG-APP-000516
<GroupDescription></GroupDescription>Group -
Digital signature algorithm used for DNSSEC-enabled zones must be FIPS-compatible.
<VulnDiscussion>The choice of digital signature algorithm will be based on recommended algorithms in well-known standards. NIST's Digital Sig...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>Authoritative name servers for an enterprise may be configured to receive requests from both external and internal clients. ...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two d...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two d...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
Primary authoritative name servers must be configured to only receive zone transfer requests from specified secondary name servers.
<VulnDiscussion>Authoritative name servers (especially primary name servers) should be configured with an allow-transfer access control subst...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The DNS implementation must be conformant to the IETF DNS specification.
<VulnDiscussion>Any DNS implementation must be designed to be able to conform to the Internet Engineering Task Force (IETF) specification. Do...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The DNS implementation must enforce a Discretionary Access Control (DAC) policy that limits propagation of access rights.
<VulnDiscussion>Discretionary Access Control (DAC) is based on the premise that individual users are "owners" of objects and therefore have d...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The DNS implementation must implement internal/external role separation.
<VulnDiscussion>DNS servers with an internal role only process name/address resolution requests from within the organization (i.e., internal ...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The DNS must utilize valid root name servers in the local root zone file.
<VulnDiscussion>All caching name servers must be authoritative for the root zone because, without this starting point, they would have no kno...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The DNS name server software must be at the latest version.
<VulnDiscussion>Each newer version of the name server software, especially the BIND software, generally is devoid of vulnerabilities found in...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The DNS Name Server software must run with restricted privileges.
<VulnDiscussion>Failure to provide logical access restrictions associated with changes to application configuration may have significant effe...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The IP address for hidden master authoritative name servers must not appear in the name servers set in the zone database.
<VulnDiscussion>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 -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The platform on which the name server software is hosted must be configured to respond to DNS traffic only.
<VulnDiscussion>OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Stand...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
The platform on which the name server software is hosted must be configured to send outgoing DNS messages from a random port.
<VulnDiscussion>OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Stand...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>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 -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>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 -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
A zone file must not include resource records that resolve to a fully qualified domain name residing in another zone.
<VulnDiscussion>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 -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
CNAME records must not point to a zone with lesser security for more than six months.
<VulnDiscussion>The use of CNAME records for exercises, tests, or zone-spanning aliases should be temporary (e.g., to facilitate a migration)...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>Configuration settings are the set of parameters that can be changed that affect the security posture and/or functionality of...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
A unique TSIG key must be generated for each pair of communicating hosts.
<VulnDiscussion>To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...Rule Medium Severity -
SRG-APP-000516
<GroupDescription></GroupDescription>Group -
All authoritative name servers for a zone must be geographically disbursed.
<VulnDiscussion>In addition to network-based dispersion, authoritative name servers should be dispersed geographically as well. In other word...Rule Medium Severity
Node 2
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