III - Administrative Sensitive
Rules and Groups employed by this XCCDF Profile
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SRG-APP-000516-DNS-000078
Group -
A BIND 9.x server validity period for the RRSIGs covering a zones DNSKEY RRSet must be no less than two days and no more than one week.
The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs in the zone and in the parent zone. This strategy limits the time durin...Rule Medium Severity -
SRG-APP-000516-DNS-000084
Group -
A BIND 9.x server NSEC3 must be used for all internal DNS zones.
To ensure that RRs associated with a query are really missing in a zone file and have not been removed in transit, the DNSSEC mechanism provides a means for authenticating the nonexistence of an RR...Rule Medium Severity -
SRG-APP-000516-DNS-000085
Group -
Every NS record in a zone file on a BIND 9.x server must point to an active name server and that name server must be 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
Group -
On a BIND 9.x server 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-000088
Group -
On a BIND 9.x server all authoritative name servers for a zone must have the same version of zone information.
It is important to maintain the integrity of a zone file. The serial number of the SOA record is used to indicate to secondary name server that a change to the zone has occurred and a zone transfer...Rule Medium Severity -
SRG-APP-000516-DNS-000102
Group -
On a BIND 9.x server all root name servers listed in the local root zone file hosted on a BIND 9.x authoritative name server must be valid for that zone.
All caching name servers must be authoritative for the root zone because, without this starting point, they would have no knowledge of the DNS infrastructure and thus would be unable to respond to ...Rule Low Severity -
SRG-APP-000516-DNS-000102
Group -
On a BIND 9.x server all root name servers listed in the local root zone file hosted on a BIND 9.x authoritative name server must be empty or removed.
A potential vulnerability of DNS is that an attacker can poison a name servers cache by sending queries that will cause the server to obtain host-to-IP address mappings from bogus name servers that...Rule Low Severity -
SRG-APP-000516-DNS-000113
Group -
On the BIND 9.x server a zone file must not include resource records that resolve to a fully qualified domain name residing in another zone.
If a name server were able to claim authority for a resource record in a domain for which it was not authoritative, this would pose a security risk. In this environment, an adversary could use illi...Rule Medium Severity -
SRG-APP-000516-DNS-000114
Group -
On the BIND 9.x server CNAME records must not point to a zone with lesser security for more than six months.
The use of CNAME records for exercises, tests, or zone-spanning aliases should be temporary (e.g., to facilitate a migration). When a host name is an alias for a record in another zone, an adversar...Rule Low Severity -
SRG-APP-000516-DNS-000500
Group -
The BIND 9.x server implementation must prohibit the forwarding of queries to servers controlled by organizations outside of the U.S. Government.
If remote servers to which DoD DNS servers send queries are controlled by entities outside of the U.S. Government the possibility of a DNS attack is increased. The Enterprise Recursive Service (E...Rule Medium Severity
Node 2
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