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I - Mission Critical Classified

Rules and Groups employed by this XCCDF Profile

  • SRG-APP-000001-DNS-000001

    <GroupDescription></GroupDescription>
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  • Infoblox systems that perform zone transfers to non-Grid DNS servers must limit the number of concurrent sessions for zone transfers.

    &lt;VulnDiscussion&gt;Limiting the number of concurrent sessions reduces the risk of denial-of-service (DoS) to the DNS implementation. Infoblox...
    Rule Medium Severity
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  • SRG-APP-000001-DNS-000115

    <GroupDescription></GroupDescription>
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  • The Infoblox system must limit the number of concurrent client connections to the number of allowed dynamic update clients.

    &lt;VulnDiscussion&gt;Limiting the number of concurrent sessions reduces the risk of denial-of-service (DoS) to the DNS implementation. Name serv...
    Rule Medium Severity
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  • SRG-APP-000333-DNS-000107

    <GroupDescription></GroupDescription>
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  • The Infoblox DNS server must not reveal sensitive information to an attacker. This includes HINFO, RP, LOC resource, and sensitive TXT record data.

    &lt;VulnDiscussion&gt;There are several types of resource records (RRs) in the DNS that are meant to convey information to humans and applications ...
    Rule Medium Severity
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  • SRG-APP-000125-DNS-000012

    <GroupDescription></GroupDescription>
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  • The Infoblox system audit records must be backed up at least every seven days onto a different system or system component than the system or component being audited.

    &lt;VulnDiscussion&gt;Protection of log data includes ensuring that log data is not accidentally lost or deleted. Backing up audit records to a dif...
    Rule Medium Severity
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  • SRG-APP-000218-DNS-000027

    <GroupDescription></GroupDescription>
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  • All authoritative name servers for a zone must be geographically disbursed.

    &lt;VulnDiscussion&gt;In addition to network-based dispersion, authoritative name servers should be dispersed geographically as well. In other word...
    Rule Medium Severity
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  • SRG-APP-000383-DNS-000047

    <GroupDescription></GroupDescription>
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  • Recursion must be disabled on Infoblox DNS servers that are configured as authoritative name servers.

    &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-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 DNSSEC signed zones.

    &lt;VulnDiscussion&gt;To ensure that resource records (RRs) associated with a query are really missing in a zone file and have not been removed in ...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000085

    <GroupDescription></GroupDescription>
    Group
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  • The Infoblox DNS server must be configured so that each name server (NS) record in a zone file points to an active name server 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 Medium 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 DNS zone file is the use of a zone file integrity checker. The effectiven...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000089

    <GroupDescription></GroupDescription>
    Group
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  • An authoritative name 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 the Internet Engineering T...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000090

    <GroupDescription></GroupDescription>
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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 High 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, 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

    <GroupDescription></GroupDescription>
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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

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

    <GroupDescription></GroupDescription>
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  • The Infoblox system must use a security policy that limits the propagation of access rights.

    &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 DNS implementation 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

    <GroupDescription></GroupDescription>
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  • The Infoblox DNS server must use current and valid root name servers.

    &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

    <GroupDescription></GroupDescription>
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  • The Infoblox NIOS version must be at the appropriate 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-000108

    <GroupDescription></GroupDescription>
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  • The IP address for hidden master authoritative name servers must not appear in the name servers set in the zone database.

    &lt;VulnDiscussion&gt;A hidden master authoritative server is an authoritative DNS server in which the IP address does not appear in the name serve...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000109

    <GroupDescription></GroupDescription>
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  • The Infoblox system must be configured to respond to DNS traffic only.

    &lt;VulnDiscussion&gt;OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Stand...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000110

    <GroupDescription></GroupDescription>
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  • The Infoblox DNS server must send outgoing DNS messages from a random port.

    &lt;VulnDiscussion&gt;OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Stand...
    Rule Medium Severity
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  • SRG-APP-000516-DNS-000112

    <GroupDescription></GroupDescription>
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  • The private keys corresponding to both the Zone Signing Key (ZSK) and the Key Signing Key (KSK) must not be kept on the DNSSEC-aware primary authoritative name server when the name server does not support dynamic updates.

    &lt;VulnDiscussion&gt;The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys shoul...
    Rule High Severity
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