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I - Mission Critical Sensitive

Rules and Groups employed by this XCCDF Profile

  • SRG-APP-000383-DNS-000047

    <GroupDescription></GroupDescription>
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  • Forwarders on an authoritative Windows 2012 DNS Server, if enabled for external resolution, must only forward to either an internal, non-AD-integrated DNS server or to the DoD Enterprise Recursive Services (ERS).

    &lt;VulnDiscussion&gt;A potential vulnerability of DNS is that an attacker can poison a name server's cache by sending queries that will cause the ...
    Rule Medium Severity
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  • SRG-APP-000383-DNS-000047

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  • The Windows 2012 DNS Server with a caching name server role must restrict recursive query responses to only the IP addresses and IP address ranges of known supported clients.

    &lt;VulnDiscussion&gt;A potential vulnerability of DNS is that an attacker can poison a name server's cache by sending queries that will cause the ...
    Rule Medium Severity
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  • SRG-APP-000383-DNS-000047

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  • The Windows 2012 DNS Server with a caching name server role must be secured against pollution by ensuring the authenticity and integrity of queried records.

    &lt;VulnDiscussion&gt;A potential vulnerability of DNS is that an attacker can poison a name server's cache by sending queries that will cause the ...
    Rule Medium Severity
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  • SRG-APP-000440-DNS-000065

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  • The Windows 2012 DNS Server must implement cryptographic mechanisms to detect changes to information during transmission unless otherwise protected by alternative physical safeguards, such as, at a minimum, a Protected Distribution System (PDS).

    &lt;VulnDiscussion&gt;Encrypting information for transmission protects information from unauthorized disclosure and modification. Cryptographic mec...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000078

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  • The validity period for the RRSIGs covering a zones DNSKEY RRSet must be no less than two days and no more than one week.

    &lt;VulnDiscussion&gt;The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000084

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  • NSEC3 must be used for all internal DNS zones.

    &lt;VulnDiscussion&gt;NSEC records list the resource record types for the name, as well as the name of the next resource record. With this informat...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000085

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  • The Windows 2012 DNS Servers zone files must have NS records that point to active name servers authoritative for the domain specified in that record.

    &lt;VulnDiscussion&gt;Poorly constructed NS records pose a security risk because they create conditions under which an adversary might be able to p...
    Rule High Severity
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  • SRG-APP-000516-DNS-000087

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  • All authoritative name servers for a zone must be located on different network segments.

    &lt;VulnDiscussion&gt;Most enterprises have an authoritative primary server and a host of authoritative secondary name servers. It is essential tha...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000088

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  • All authoritative name servers for a zone must have the same version of zone information.

    &lt;VulnDiscussion&gt;The only protection approach for content control of a DNS zone file is the use of a zone file integrity checker. The effectiv...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000089

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  • The Windows 2012 DNS Server must be configured to enable DNSSEC Resource Records.

    &lt;VulnDiscussion&gt;The specification for a digital signature mechanism in the context of the DNS infrastructure is in IETF's DNSSEC standard. I...
    Rule High Severity
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  • SRG-APP-000516-DNS-000090

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  • Digital signature algorithm used for DNSSEC-enabled zones must be FIPS-compatible.

    &lt;VulnDiscussion&gt;The choice of digital signature algorithm will be based on recommended algorithms in well-known standards. NIST's Digital Sig...
    Rule Medium Severity
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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.

    &lt;VulnDiscussion&gt;Authoritative name servers for an enterprise may be configured to receive requests from both external and internal clients. ...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000092

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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-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.

    &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-DNS-000095

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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 sub s...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000099

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  • The Windows 2012 DNS Servers zone database files must not be accessible for edit/write by users and/or processes other than the Windows 2012 DNS Server service account and/or the DNS database administrator.

    &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-DNS-000101

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  • The Windows 2012 DNS Server 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-DNS-000102

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  • The Windows 2012 DNS Server authoritative for local zones must only point root hints to the DNS servers that host the internal root domain.

    &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-DNS-000103

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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-DNS-000113

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  • The Windows 2012 DNS Servers zone files 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-DNS-000114

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  • The Windows 2012 DNS Servers zone files must not include CNAME records pointing 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 (pointing to zones with lesser security) aliases should be te...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000500

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  • Non-routable IPv6 link-local scope addresses must not be configured in any zone.

    &lt;VulnDiscussion&gt;IPv6 link-local scope addresses are not globally routable and must not be configured in any DNS zone. Similar to RFC1918 add...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000500

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  • AAAA addresses must not be configured in a zone for hosts that are not IPv6-aware.

    &lt;VulnDiscussion&gt;DNS is only responsible for resolving a domain name to an IP address. Applications and operating systems are responsible for...
    Rule Medium Severity
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  • SRG-APP-000142-DNS-000014

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  • The Windows 2012 DNS Server must be configured to prohibit or restrict unapproved ports and protocols.

    &lt;VulnDiscussion&gt;In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....
    Rule Medium Severity
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  • SRG-APP-000390-DNS-000048

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  • The Windows 2012 DNS Server must require devices to re-authenticate for each dynamic update request connection attempt.

    &lt;VulnDiscussion&gt;Without re-authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity...
    Rule Medium Severity
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