II - Mission Support Public
Rules and Groups employed by this XCCDF Profile
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SRG-APP-000516-DNS-000078
<GroupDescription></GroupDescription>Group -
The Zone Signing Key (ZSK) rollover interval must be configured to less than two months.
<VulnDiscussion>An attacker that has compromised a ZSK can use that key only during the KSK's signature validity interval. An attacker that h...Rule Medium Severity -
SRG-APP-000516-DNS-000084
<GroupDescription></GroupDescription>Group -
NSEC3 must be used for all internal DNS zones.
<VulnDiscussion>To ensure that RRs associated with a query are really missing in a zone file and have not been removed in transit, the DNSSEC...Rule Medium Severity -
SRG-APP-000516-DNS-000085
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>Poorly constructed NS records pose a security risk because they create conditions under which an adversary might be able to p...Rule Medium Severity -
SRG-APP-000516-DNS-000087
<GroupDescription></GroupDescription>Group -
All authoritative name servers for a zone must be located on different network segments.
<VulnDiscussion>Most enterprises have an authoritative primary server and a host of authoritative secondary name servers. It is essential tha...Rule Medium Severity -
SRG-APP-000516-DNS-000089
<GroupDescription></GroupDescription>Group -
An authoritative name server must be configured to enable DNSSEC Resource Records.
<VulnDiscussion>The specification for a digital signature mechanism in the context of the DNS infrastructure is in IETF's DNSSEC standard. In...Rule Medium Severity -
SRG-APP-000516-DNS-000090
<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 High Severity -
SRG-APP-000516-DNS-000091
<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-DNS-000092
<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-DNS-000093
<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-DNS-000099
<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
Node 2
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