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BIND 9.x Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The secondary name servers in a BIND 9.x implementation must be configured to initiate zone update notifications to other authoritative zone name servers.

    <VulnDiscussion>It is important to maintain the integrity of a zone file. The serial number of the SOA record is used to indicate to secondar...
    Rule Low Severity
    Show

  • SRG-APP-000516-DNS-000110

    <GroupDescription></GroupDescription>
    Group
    Show

  • On the BIND 9.x server the platform on which the name server software is hosted must be configured to send outgoing DNS messages from a random port.

    &lt;VulnDiscussion&gt;Hosts that run the name server software should not provide any other services and therefore should be configured to respond t...
    Rule Low Severity
    Show

  • SRG-APP-000447-DNS-000068

    <GroupDescription></GroupDescription>
    Group
    Show

  • A BIND 9.x caching name server must implement DNSSEC validation to check all DNS queries for invalid input.

    &lt;VulnDiscussion&gt;A common vulnerability of applications is unpredictable behavior when invalid inputs are received. This requirement guards ag...
    Rule Medium Severity
    Show

  • SRG-APP-000001-DNS-000001

    <GroupDescription></GroupDescription>
    Group
    Show

  • A BIND 9.x master name server must limit the number of concurrent zone transfers between authorized secondary name servers.

    &lt;VulnDiscussion&gt;Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation. Name serve...
    Rule Medium Severity
    Show

  • SRG-APP-000246-DNS-000035

    <GroupDescription></GroupDescription>
    Group
    Show

  • A BIND 9.x implementation configured as a caching name server must restrict recursive queries to only the IP addresses and IP address ranges of known supported clients.

    &lt;VulnDiscussion&gt;Any host that can query a resolving name server has the potential to poison the servers name cache or take advantage of other...
    Rule Medium Severity
    Show

  • SRG-APP-000158-DNS-000015

    <GroupDescription></GroupDescription>
    Group
    Show

  • The BIND 9.x server implementation must uniquely identify and authenticate the other DNS server before responding to a server-to-server transaction, zone transfer and/or dynamic update request using cryptographically based bidirectional authentication to protect the integrity of the information in transit.

    &lt;VulnDiscussion&gt;Server-to-server (zone transfer) transactions are provided by TSIG, which enforces mutual server authentication using a key t...
    Rule High Severity
    Show

  • SRG-APP-000158-DNS-000015

    <GroupDescription></GroupDescription>
    Group
    Show

  • The BIND 9.x server implementation must utilize separate TSIG key-pairs when securing server-to-server transactions.

    &lt;VulnDiscussion&gt;Server-to-server (zone transfer) transactions are provided by TSIG, which enforces mutual server authentication using a key t...
    Rule Medium Severity
    Show

  • SRG-APP-000176-DNS-000018

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TSIG keys used with the BIND 9.x implementation must be owned by a privileged account.

    &lt;VulnDiscussion&gt;Incorrect ownership of a TSIG key file could allow an adversary to modify the file, thus defeating the security objective.&lt...
    Rule Medium Severity
    Show

  • SRG-APP-000176-DNS-000018

    <GroupDescription></GroupDescription>
    Group
    Show

  • The TSIG keys used with the BIND 9.x implementation must be group owned by a privileged account.

    &lt;VulnDiscussion&gt;Incorrect ownership of a TSIG key file could allow an adversary to modify the file, thus defeating the security objective.&lt...
    Rule Medium Severity
    Show

  • SRG-APP-000176-DNS-000019

    <GroupDescription></GroupDescription>
    Group
    Show

  • The read and write access to a TSIG key file used by a BIND 9.x server must be restricted to only the account that runs the name server software.

    &lt;VulnDiscussion&gt;Weak permissions of a TSIG key file could allow an adversary to modify the file, thus defeating the security objective.&lt;/V...
    Rule Medium Severity
    Show

  • SRG-APP-000516-DNS-000500

    <GroupDescription></GroupDescription>
    Group
    Show

  • The BIND 9.X implementation must not utilize a TSIG or DNSSEC key for more than one year.

    &lt;VulnDiscussion&gt;Cryptographic keys are the backbone of securing DNS information over the wire, maintaining DNS data integrity, and the provid...
    Rule Medium Severity
    Show

  • SRG-APP-000514-DNS-000075

    <GroupDescription></GroupDescription>
    Group
    Show

  • A BIND 9.x server must implement NIST FIPS-validated cryptography for provisioning digital signatures and generating cryptographic hashes.

    &lt;VulnDiscussion&gt;The use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The applic...
    Rule High Severity
    Show

  • The DNSSEC keys used with the BIND 9.x implementation must be owned by a privileged account.

    &lt;VulnDiscussion&gt;Information at rest refers to the state of information when it is located on a secondary storage device within an organizatio...
    Rule Medium Severity
    Show

  • SRG-APP-000231-DNS-000033

    <GroupDescription></GroupDescription>
    Group
    Show

  • The DNSSEC keys used with the BIND 9.x implementation must be group owned by a privileged account.

    &lt;VulnDiscussion&gt;Information at rest refers to the state of information when it is located on a secondary storage device within an organizatio...
    Rule Medium Severity
    Show

  • SRG-APP-000231-DNS-000033

    <GroupDescription></GroupDescription>
    Group
    Show

  • Permissions assigned to the DNSSEC keys used with the BIND 9.x implementation must enforce read-only access to the key owner and deny access to all other users.

    &lt;VulnDiscussion&gt;Information at rest refers to the state of information when it is located on a secondary storage device within an organizatio...
    Rule Medium Severity
    Show

  • SRG-APP-000176-DNS-000094

    <GroupDescription></GroupDescription>
    Group
    Show

  • The BIND 9.x server private key corresponding to the ZSK pair must be the only DNSSEC key kept on a name server that supports dynamic updates.

    &lt;VulnDiscussion&gt;The private key in the ZSK key pair must be protected from unauthorized access. If possible, the private key should be stored...
    Rule High Severity
    Show

  • SRG-APP-000516-DNS-000112

    <GroupDescription></GroupDescription>
    Group
    Show

  • On the BIND 9.x server the private keys corresponding to both the ZSK and the KSK must not be kept on the BIND 9.x 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 Medium Severity
    Show

  • SRG-APP-000516-DNS-000086

    <GroupDescription></GroupDescription>
    Group
    Show

  • The two files generated by the BIND 9.x server dnssec-keygen program must be owned by the root account, or deleted, after they have been copied to the key file in the name server.

    &lt;VulnDiscussion&gt;To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...
    Rule Medium Severity
    Show

  • SRG-APP-000516-DNS-000086

    <GroupDescription></GroupDescription>
    Group
    Show

  • The two files generated by the BIND 9.x server dnssec-keygen program must be group owned by the server administrator account, or deleted, after they have been copied to the key file in the name server.

    &lt;VulnDiscussion&gt;To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...
    Rule Medium Severity
    Show

  • SRG-APP-000516-DNS-000086

    <GroupDescription></GroupDescription>
    Group
    Show

  • Permissions assigned to the dnssec-keygen keys used with the BIND 9.x implementation must enforce read-only access to the key owner and deny access to all other users.

    &lt;VulnDiscussion&gt;To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...
    Rule Medium Severity
    Show

  • SRG-APP-000176-DNS-000096

    <GroupDescription></GroupDescription>
    Group
    Show

  • The BIND 9.x server signature generation using the KSK must be done off-line, using the KSK-private key stored off-line.

    &lt;VulnDiscussion&gt;The private key in the KSK key pair must be protected from unauthorized access. The private key should be stored off-line (wi...
    Rule High Severity
    Show

  • SRG-APP-000213-DNS-000024

    <GroupDescription></GroupDescription>
    Group
    Show

  • A BIND 9.x server implementation must maintain the integrity and confidentiality of DNS information while it is being prepared for transmission, in transmission, and in use and t must perform integrity verification and data origin verification for all DNS information.

    &lt;VulnDiscussion&gt;DNSSEC is required for securing the DNS query/response transaction by providing data origin authentication and data integrity...
    Rule High Severity
    Show

  • SRG-APP-000214-DNS-000025

    <GroupDescription></GroupDescription>
    Group
    Show

  • A BIND 9.x server implementation must provide the means to indicate the security status of child zones.

    &lt;VulnDiscussion&gt;If name server replies are invalid or cannot be validated, many networking functions and communication would be adversely aff...
    Rule Medium Severity
    Show

  • SRG-APP-000214-DNS-000079

    <GroupDescription></GroupDescription>
    Group
    Show

  • The BIND 9.x server validity period for the RRSIGs covering the DS RR for zones 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
    Show

  • SRG-APP-000516-DNS-000099

    <GroupDescription></GroupDescription>
    Group
    Show

  • The core BIND 9.x server files must be owned by the root or BIND 9.x process account.

    &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
    Show

  • SRG-APP-000516-DNS-000099

    <GroupDescription></GroupDescription>
    Group
    Show

  • The core BIND 9.x server files must be group owned by a group designated for DNS administration only.

    &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
    Show

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