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I - Mission Critical Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-APP-000348-DNS-000042

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server must be configured to record who added/modified/deleted DNS zone information.

    &lt;VulnDiscussion&gt;Without a means for identifying the individual that produced the information, the information cannot be relied on. Identifyin...
    Rule Medium Severity
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  • SRG-APP-000350-DNS-000044

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server must notify the DNS administrator in the event of an error validating another DNS server's identity.

    &lt;VulnDiscussion&gt;Failing to act on validation errors may result in the use of invalid, corrupted, or compromised information. The validation o...
    Rule Medium Severity
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  • SRG-APP-000089-DNS-000004

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server log must be enabled.

    &lt;VulnDiscussion&gt;Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events r...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000500

    <GroupDescription></GroupDescription>
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  • The "Manage auditing and security log" user right must be assigned only to authorized personnel.

    &lt;VulnDiscussion&gt;Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events r...
    Rule Medium Severity
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  • SRG-APP-000214-DNS-000079

    <GroupDescription></GroupDescription>
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  • The validity period for the Resource Record Signatures (RRSIGs) covering the Delegation Signer (DS) Resource Record (RR) for a zone's delegated children 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-000218-DNS-000027

    <GroupDescription></GroupDescription>
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  • The Windows DNS name servers for a zone must be geographically dispersed.

    &lt;VulnDiscussion&gt;In addition to network-based separation, authoritative name servers should be dispersed geographically. In other words, in ad...
    Rule Medium Severity
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  • SRG-APP-000383-DNS-000047

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server must prohibit recursion on authoritative name servers for which forwarders have not been configured for external queries.

    &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

    <GroupDescription></GroupDescription>
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  • Forwarders on an authoritative Windows DNS Server, if enabled for external resolution, must forward only to an internal, non-Active Directory (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

    <GroupDescription></GroupDescription>
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  • The Windows 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 High Severity
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  • SRG-APP-000440-DNS-000065

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server must implement cryptographic mechanisms to detect changes to information during transmission.

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

    <GroupDescription></GroupDescription>
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  • The validity period for the Resource Record Signatures (RRSIGs) covering a zone's 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

    <GroupDescription></GroupDescription>
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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. This information r...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000085

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server's 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

    <GroupDescription></GroupDescription>
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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

    <GroupDescription></GroupDescription>
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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

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server must be configured to enable DNSSEC Resource Records (RRs).

    &lt;VulnDiscussion&gt;The specification for a digital signature mechanism in the context of the DNS infrastructure is in the Internet Engineering T...
    Rule High Severity
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  • SRG-APP-000516-DNS-000090

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  • The 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

    <GroupDescription></GroupDescription>
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  • For zones split between the external and internal sides of a network, the resource records (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

    <GroupDescription></GroupDescription>
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  • In a split DNS configuration 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-000095

    <GroupDescription></GroupDescription>
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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-DNS-000099

    <GroupDescription></GroupDescription>
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  • The Windows DNS Servers zone database files must not be accessible for edit/write by users and/or processes other than the Windows 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

    <GroupDescription></GroupDescription>
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  • The Windows 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 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-000113

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  • The Windows 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 could claim authority for a resource record in a domain for which it was not authoritative, this would pose ...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000114

    <GroupDescription></GroupDescription>
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  • The Windows DNS Server's 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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