BIND 9.x Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-APP-000125-DNS-000012
<GroupDescription></GroupDescription>Group -
The BIND 9.x server implementation must maintain at least 3 file versions of the local log file.
<VulnDiscussion>DNS software administrators require DNS transaction logs for a wide variety of reasons including troubleshooting, intrusion d...Rule Low Severity -
SRG-APP-000001-DNS-000001
<GroupDescription></GroupDescription>Group -
The BIND 9.x secondary name server must limit the number of zones requested from a single master name server.
<VulnDiscussion>Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation. Name serve...Rule Medium Severity -
SRG-APP-000001-DNS-000001
<GroupDescription></GroupDescription>Group -
The BIND 9.x secondary name server must limit the total number of zones the name server can request at any one time.
<VulnDiscussion>Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation. Name serve...Rule Medium Severity -
SRG-APP-000001-DNS-000115
<GroupDescription></GroupDescription>Group -
The BIND 9.x server implementation must limit the number of concurrent session client connections to the number of allowed dynamic update clients.
<VulnDiscussion>Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation. Name serv...Rule Medium Severity -
SRG-APP-000142-DNS-000014
<GroupDescription></GroupDescription>Group -
The BIND 9.x server implementation must be configured to use only approved ports and protocols.
<VulnDiscussion>In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e....Rule Medium Severity -
SRG-APP-000247-DNS-000036
<GroupDescription></GroupDescription>Group -
A BIND 9.x server implementation must manage excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of Denial of Service (DoS) attacks.
<VulnDiscussion>A DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot ...Rule Medium Severity -
SRG-APP-000246-DNS-000035
<GroupDescription></GroupDescription>Group -
A BIND 9.x server implementation must prohibit recursion on authoritative name servers.
<VulnDiscussion>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 -
SRG-APP-000516-DNS-000088
<GroupDescription></GroupDescription>Group -
The master servers in a BIND 9.x implementation must notify authorized secondary name servers when zone files are updated.
<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 -
SRG-APP-000516-DNS-000088
<GroupDescription></GroupDescription>Group -
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 -
SRG-APP-000516-DNS-000110
<GroupDescription></GroupDescription>Group -
The BIND 9.X implementation must not utilize a TSIG or DNSSEC key for more than one year.
<VulnDiscussion>Cryptographic keys are the backbone of securing DNS information over the wire, maintaining DNS data integrity, and the provid...Rule Medium Severity -
SRG-APP-000514-DNS-000075
<GroupDescription></GroupDescription>Group -
A BIND 9.x server must implement NIST FIPS-validated cryptography for provisioning digital signatures and generating cryptographic hashes.
<VulnDiscussion>The use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The applic...Rule High Severity -
SRG-APP-000231-DNS-000033
<GroupDescription></GroupDescription>Group -
The DNSSEC keys used with the BIND 9.x implementation must be owned by a privileged account.
<VulnDiscussion>Information at rest refers to the state of information when it is located on a secondary storage device within an organizatio...Rule Medium Severity -
SRG-APP-000231-DNS-000033
<GroupDescription></GroupDescription>Group -
The DNSSEC keys used with the BIND 9.x implementation must be group owned by a privileged account.
<VulnDiscussion>Information at rest refers to the state of information when it is located on a secondary storage device within an organizatio...Rule Medium Severity -
SRG-APP-000231-DNS-000033
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>Information at rest refers to the state of information when it is located on a secondary storage device within an organizatio...Rule Medium Severity -
SRG-APP-000176-DNS-000094
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>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 -
SRG-APP-000516-DNS-000112
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>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 -
SRG-APP-000516-DNS-000086
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...Rule Medium Severity -
SRG-APP-000516-DNS-000086
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...Rule Medium Severity -
SRG-APP-000516-DNS-000086
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every ...Rule Medium Severity -
SRG-APP-000176-DNS-000096
<GroupDescription></GroupDescription>Group -
The BIND 9.x server signature generation using the KSK must be done off-line, using the KSK-private key stored off-line.
<VulnDiscussion>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 -
SRG-APP-000213-DNS-000024
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>DNSSEC is required for securing the DNS query/response transaction by providing data origin authentication and data integrity...Rule High Severity -
SRG-APP-000214-DNS-000025
<GroupDescription></GroupDescription>Group -
A BIND 9.x server implementation must provide the means to indicate the security status of child zones.
<VulnDiscussion>If name server replies are invalid or cannot be validated, many networking functions and communication would be adversely aff...Rule Medium Severity -
SRG-APP-000214-DNS-000079
<GroupDescription></GroupDescription>Group -
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.
<VulnDiscussion>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 -
SRG-APP-000516-DNS-000099
<GroupDescription></GroupDescription>Group -
The core BIND 9.x server files must be owned by the root or BIND 9.x process account.
<VulnDiscussion>Discretionary Access Control (DAC) is based on the premise that individual users are "owners" of objects and therefore have d...Rule Medium Severity -
SRG-APP-000516-DNS-000099
<GroupDescription></GroupDescription>Group -
The core BIND 9.x server files must be group owned by a group designated for DNS administration only.
<VulnDiscussion>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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