| SRG-APP-000243-DNS-000034 | Medium | The DNS server implementation must prevent unauthorized and unintended information transfer via shared system resources. | Preventing unauthorized information transfers mitigates the risk of information, including encrypted representations of information, produced by the actions of prior users/roles (or the actions of... |
| SRG-APP-000266-DNS-000038 | Medium | The DNS server implementation must generate error messages that provide information necessary for corrective actions without revealing information that could be exploited by adversaries. | Any application providing too much information in error messages risks compromising the data and security of the application and system. The structure and content of error messages needs to be... |
| SRG-APP-000428-DNS-000061 | Medium | The DNS server implementation must utilize cryptographic mechanisms to prevent unauthorized modification of DNS zone data. | Applications handling data requiring "data-at-rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.
Selection of a... |
| SRG-APP-000350-DNS-000044 | Medium | In the event of an error when validating the binding of another DNS server's identity to the DNS information, the DNS server implementation must log the event and send notification to the DNS administrator. | Failing to act on the validation errors may result in the use of invalid, corrupted or compromised information. The validation of bindings can be achieved, for example, by the use of cryptographic... |
| SRG-APP-000516-DNS-000114 | Medium | CNAME records must not point to a zone with lesser security for more than six months. | The use of CNAME records for exercises, tests or zone-spanning aliases should be temporary (e.g., to facilitate a migration). When a host name is an alias for a record in another zone, an... |
| SRG-APP-000516-DNS-000113 | Medium | A zone file must not include resource records which resolve to a fully qualified domain name residing in another zone.
| If a name server were able to claim authority for a resource record in a domain for which it was not authoritative, this would pose a security risk. In this environment, an adversary could use... |
| SRG-APP-000516-DNS-000112 | Medium | The private keys corresponding to both the ZSK and the KSK must not be kept on the DNSSEC-aware primary authoritative name server when the name server does not support dynamic updates. | The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys should be stored off-line (with respect to the Internet-facing, DNSSEC-aware... |
| SRG-APP-000348-DNS-000042 | Medium | The DNS server implementation must provide the means for authorized individuals to determine the identity of the source of the DNS server-provided information. | Without a means for identifying the individual that produced the information, the information cannot be relied upon. Identifying the validity of information may be delayed or deterred.
This... |
| SRG-APP-000516-DNS-000110 | Medium | The platform on which the name server software is hosted must be configured to send outgoing DNS messages from a random port. | OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Standards and Technology's (NIST’s) National Vulnerability Database (NVD),... |
| SRG-APP-000089-DNS-000004 | Medium | The DNS server implementation must be configured to provide audit record generation capability for DoD-defined auditable events within all DNS server components. | Without the capability to generate audit records, it would be difficult to establish, correlate, and investigate the events relating to an incident, or identify those responsible for one. The... |
| SRG-APP-000441-DNS-000066 | Medium | The DNS server implementation must maintain the integrity of information during preparation for transmission. | Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission including, for example, during aggregation, at protocol transformation points,... |
| SRG-APP-000001-DNS-000001 | Medium | The DNS implementation must limit the number of concurrent sessions for zone transfers and client connections to the number of secondary name servers and allowed dynamic update clients, respectively. | Limiting the number of concurrent sessions reduces the risk of Denial of Service (DoS) to the DNS implementation.
Name servers do not have direct user connections but accept client connections... |
| SRG-APP-000349-DNS-000043 | Medium | The DNS server implementation must validate the binding of the other DNS server's identity to the DNS information for a server-to-server transaction (e.g., zone transfer). | Validation of the binding of the information prevents the modification of information between production and review. The validation of bindings can be achieved, for example, by the use of... |
| SRG-APP-000451-DNS-000069 | Medium | The DNS server implementation must follow procedures to re-role a secondary name server as the master name server should the master name server permanently loses functionality. | Failing to an unsecure condition negatively impacts application security and can lead to system compromise. Failure conditions include, for example, loss of communications among critical system... |
| SRG-APP-000185-DNS-000021 | Medium | The DNS server implementation must employ strong authenticators in the establishment of non-local maintenance and diagnostic sessions. | If maintenance tools are used by unauthorized personnel, they may accidentally or intentionally damage or compromise the system. The act of managing systems and applications includes the ability... |
| SRG-APP-000425-DNS-000058 | Medium | A DNS server implementation must perform data integrity verification on the name/address resolution responses the system receives from authoritative sources. | If data origin authentication and data integrity verification is not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been... |
| SRG-APP-000514-DNS-000075 | Medium | The application must implement NIST FIPS-validated cryptography for provisioning digital signatures, generating cryptographic hashes, and protecting unclassified information requiring confidentiality. | Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The application must implement cryptographic modules adhering to the higher standards... |
| SRG-APP-000226-DNS-000032 | Medium | In the event of a system failure, the DNS server implementation must preserve any information necessary to determine cause of failure and any information necessary to return to operations with least disruption to mission processes. | Failure to a known state can address safety or security in accordance with the mission/business needs of the organization. Failure to a known secure state helps prevent a loss of confidentiality,... |
| SRG-APP-000275-DNS-000040 | Medium | The DNS server implementation must be configured to generate audit records for failed security verification tests so that the IAO and IAM can be notified of the failures. | Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data... |
| SRG-APP-000179-DNS-000020 | Medium | The DNS server implementation must use mechanisms meeting the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module. | Unapproved mechanisms that are used for authentication to the cryptographic module are not verified, and therefore cannot be relied upon to provide confidentiality or integrity and DoD data may be... |
| SRG-APP-000516-DNS-000109 | Medium | The platform on which the name server software is hosted must be configured to respond to DNS traffic only. | OS configuration practices as issued by the US Computer Emergency Response Team (US CERT) and the National Institute of Standards and Technology's (NIST’s) National Vulnerability Database (NVD),... |
| SRG-APP-000516-DNS-000100 | Medium | The DNS implementation must generate audit records for the success and failure of zone transfers on the DNS server. | Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being performed on the system, where an event occurred, when an event... |
| SRG-APP-000516-DNS-000101 | Medium | The DNS implementation must implement internal/external role separation. | DNS servers with an internal role only process name/address resolution requests from within the organization (i.e., internal clients). DNS servers with an external role only process name/address... |
| SRG-APP-000516-DNS-000102 | Medium | The DNS must utilize valid root name servers in the local root zone file. | All caching name servers must be authoritative for the root zone because, without this starting point, they would have no knowledge of the DNS infrastructure and thus would be unable to respond to... |
| SRG-APP-000516-DNS-000103 | Medium | The DNS name server software must be at the latest version. | Each newer version of the name server software, especially the BIND software, generally is devoid of vulnerabilities found in earlier versions because it has design changes incorporated to take... |
| SRG-APP-000516-DNS-000104 | Medium | The DNS Name Server software must be configured to refuse queries for its version information. | Each newer version of the name server software, especially the BIND software, generally is devoid of vulnerabilities found in earlier versions because it has design changes incorporated to take... |
| SRG-APP-000516-DNS-000105 | Medium | The DNS Name Server software must run with restricted privileges. | Failure to provide logical access restrictions associated with changes to application configuration may have significant effects on the overall security of the system. When dealing with access... |
| SRG-APP-000516-DNS-000107 | Medium | The HINFO, RP, TXT and LOC RR types must not be used in the zone SOA. | A DNS administrator should take care when including HINFO, RP, TXT, LOC, or other RR types that could divulge information that would be useful to an attacker or the external view of a zone if... |
| SRG-APP-000353-DNS-000045 | Medium | The DNS server implementation must be configured to allow DNS administrators to change the auditing to be performed on all DNS server components, based on all selectable event criteria. | If authorized individuals do not have the ability to modify auditing parameters in response to a changing threat environment, the organization may not be able to effectively respond, and important... |
| SRG-APP-000225-DNS-000031 | Medium | The DNS server implementation must fail to a secure state if system initialization fails, shutdown fails, or aborts fail. | Failure to a known safe state helps prevent systems from failing to a state that may cause loss of data or unauthorized access to system resources. Applications or systems that fail suddenly and... |
| SRG-APP-000039-DNS-000003 | Medium | The DNS server implementation must enforce approved authorizations for controlling the flow of information between DNS servers and between DNS servers and DNS clients based on DNSSEC policies. | A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If information flow is not enforced based on approved authorizations,... |
| SRG-APP-000516-DNS-000089 | Medium | An authoritative name server must be configured to enable DNSSEC Resource Records. | The specification for a digital signature mechanism in the context of the DNS infrastructure is in IETF’s DNSSEC standard. In DNSSEC, trust in the public key (for signature verification) of the... |
| SRG-APP-000516-DNS-000088 | Medium | All authoritative name servers for a zone must have the same version of zone information. | The only protection approach for content control of DNS zone file is the use of a zone file integrity checker. The effectiveness of integrity checking using a zone file integrity checker depends... |
| SRG-APP-000516-DNS-000081 | Medium | The DNS implementation must generate audit records for the success and failure of zone transfers on the DNS server. | Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being performed on the system, where an event occurred, when an event... |
| SRG-APP-000516-DNS-000083 | Medium | The DNS server implementation must be configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs. | Configuration settings are the set of parameters that can be changed that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting... |
| SRG-APP-000516-DNS-000082 | Medium | The DNS implementation must generate audit records for the success and failure of zone transfer and dynamic update request events. | Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being performed on the system, where an event occurred, when an event... |
| SRG-APP-000516-DNS-000085 | Medium | The DNS implementation must ensure each NS record in a zone file points to an active name server authoritative for the domain specified in that record. | Poorly constructed NS records pose a security risk because they create conditions under which an adversary might be able to provide the missing authoritative name services that are improperly... |
| SRG-APP-000516-DNS-000084 | Medium | NSEC3 must be used for all DNS zone NS RR records. | Poorly constructed NS records pose a security risk because they create conditions under which an adversary might be able to provide the missing authoritative name services that are improperly... |
| SRG-APP-000516-DNS-000087 | Medium | All authoritative name servers for a zone must be located on different network segments. | Most enterprises have an authoritative primary server and a host of authoritative secondary name servers. It is essential that these authoritative name servers for an enterprise be located on... |
| SRG-APP-000516-DNS-000086 | Medium | The two files generated by the dnssec-keygen program must be made accessible only to the server administrator account, or deleted, after they have been copied to the key file in the name server. | To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key also can be used for securing other... |
| SRG-APP-000395-DNS-000050 | Medium | The DNS server implementation must authenticate another DNS server before establishing a remote and/or network connection using bidirectional authentication that is cryptographically based. | Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Bidirectional authentication provides stronger safeguards to validate... |
| SRG-APP-000423-DNS-000056 | Medium | A DNS server implementation must request data origin authentication verification on the name/address resolution responses the system receives from authoritative sources. | If data origin authentication and data integrity verification is not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been... |
| SRG-APP-000214-DNS-000025 | Medium | A DNS server implementation must provide the means to indicate the security status of child zones. | If name server replies are invalid or cannot be validated, many networking functions and communication would be adversely affected. With DNS, the presence of Delegation Signer (DS) records... |
| SRG-APP-000099-DNS-000010 | Medium | The DNS server implementation must produce audit records that contain information to establish the outcome of the events. | Without information about the outcome of events, security personnel cannot make an accurate assessment as to whether an attack was successful or if changes were made to the security state of the... |
| SRG-APP-000516-DNS-000076 | Medium | A unique TSIG key must be generated for each pair of communicating hosts. | To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key also can be used for securing other... |
| SRG-APP-000516-DNS-000077 | Medium | The salt value for zones signed using NSEC3 RRs must be changed every time the zone is completely re-signed. | NSEC3 RRs contain other options than just the (hashed) next name and RRType bitmap. There are also 2 values associated with the NSEC3 RR: the iterations (number of times each name is hashed) and... |
| SRG-APP-000100-DNS-000011 | Medium | The DNS server implementation must generate audit records containing information that establishes the identity of any individual or process associated with the event. | Without information that establishes the identity of the subjects (i.e., users or processes acting on behalf of users) associated with the events, security personnel cannot determine... |
| SRG-APP-000440-DNS-000065 | Medium | The DNS server implementation 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 Systems (PDS). | Encrypting information for transmission protects information from unauthorized disclosure and modification. Cryptographic mechanisms implemented to protect information integrity include, for... |
| SRG-APP-000516-DNS-000078 | Medium | The validity period for the RRSIGs covering a zone’s DNSKEY RRSet must be no less than two days and no more than one week. | The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs in the zone and in the parent zone. This strategy limits the time... |
| SRG-APP-000516-DNS-000079 | Medium | The validity period for the RRSIGs covering the DS RR for a zone's delegated children must be no less than two days and no more than one week. | The best way for a zone administrator to minimize the impact of a key compromise is by limiting the validity period of RRSIGs in the zone and in the parent zone. This strategy limits the time... |
| SRG-APP-000383-DNS-000047 | Medium | The DNS implementation must prohibit recursion on authoritative name servers. | A potential vulnerability of DNS is that an attacker can poison a name server's cache by sending queries that will cause the server to obtain host-to-IP address mappings from bogus name servers... |
| SRG-APP-000383-DNS-000046 | Medium | The DNS implementation must disable use of nonsecure protocols. | In this context an unsecure protocol is one that has not been evaluated and accepted for use as per the Ports, Protocols, and Services Category Assignments List (CAL) from DISA (PPSM).
Disabling... |
| SRG-APP-000176-DNS-000017 | Medium | The DNS server implementation, when using PKI-based authentication, must enforce authorized access to the corresponding private key. | The cornerstone of the PKI is the private key used to encrypt or digitally sign information. If the private key is stolen, this will lead to the compromise of the authentication and... |
| SRG-APP-000473-DNS-000072 | Medium | The DNS server implementation must perform verification of the correct operation of security functions: upon system start-up and/or restart; upon command by a user with privileged access; and/or every 30 days. | Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data... |
| SRG-APP-000516-DNS-000098 | Medium | The DNS implementation must employ FIPS-validated cryptography to implement digital signatures. | The most common vulnerabilities with cryptographic modules are those associated with poor implementation. FIPS 140-2 validation and NSA approval provide assurance that the relevant cryptography... |
| SRG-APP-000516-DNS-000099 | Medium | The DNS implementation must enforce a Discretionary Access Control (DAC) policy that limits propagation of access rights. | Discretionary Access Control (DAC) is based on the premise that individual users are "owners" of objects and therefore have discretion over who should be authorized to access the object and in... |
| SRG-APP-000516-DNS-000092 | Medium | 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. | Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two different sets of authoritative name servers.
One set, called external... |
| SRG-APP-000516-DNS-000093 | Medium | 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. | Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two different sets of authoritative name servers.
One set, called external... |
| SRG-APP-000516-DNS-000090 | Medium | Digital signature algorithm used for DNSSEC-enabled zones must be FIPS-compatible. | The choice of digital signature algorithm will be based on recommended algorithms in well-known standards. NIST’s Digital Signature Standard (DSS) [FIPS186] provides three algorithm choices:
•... |
| SRG-APP-000516-DNS-000091 | Medium | 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. | Authoritative name servers for an enterprise may be configured to receive requests from both external and internal clients.
External clients need to receive RRs that pertain only to public... |
| SRG-APP-000516-DNS-000096 | Medium | Signature generation using the KSK must be done off-line, using the KSK-private stored off-line. | Security-relevant information is any information within information systems that can potentially impact the operation of security functions or the provision of security services in a manner that... |
| SRG-APP-000516-DNS-000097 | Medium | The DNS implementation must be conformant to the IETF DNS specification. | Any DNS implementation must be designed to be able to conform to the Internet Engineering Task Force (IETF) specification. DoD utilizes many different DNS servers, and it is essential that core... |
| SRG-APP-000516-DNS-000094 | Medium | Only the private key corresponding to the ZSK alone must be kept on the name server that does support dynamic updates. | The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys should be stored off-line (with respect to the Internet-facing, DNSSEC-aware... |
| SRG-APP-000516-DNS-000095 | Medium | Primary authoritative name servers must be configured to only receive zone transfer requests from specified secondary name servers. | Authoritative name servers (especially primary name servers) should be configured with an allow-transfer access control substatement designating the list of hosts from which zone transfer requests... |
| SRG-APP-000125-DNS-000012 | Medium | The DNS server implementation's 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. | Protection of log data includes assuring log data is not accidentally lost or deleted. Backing up audit records to a different system or onto separate media than the system being audited on a... |
| SRG-APP-000504-DNS-000074 | Medium | The DNS implementation must generate audit records for the success and failure of start and stop of the name server service or daemon. | Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being performed on the system, where an event occurred, when an event... |
| SRG-APP-000516-DNS-000111 | Medium | The private key corresponding to the ZSK, stored on name servers accepting dynamic updates, must have appropriate directory/file-level access control list-based or cryptography-based protections. | The private keys in the KSK and ZSK key pairs must be protected from unauthorized access. If possible, the private keys should be stored off-line (with respect to the Internet-facing, DNSSEC-aware... |
| SRG-APP-000215-DNS-000026 | Medium | A DNS server implementation must provide the means to enable verification of a chain of trust among parent and child domains (if the child supports secure resolution services). | If name server replies are invalid or cannot be validated, many networking functions and communication would be adversely affected. With DNS, the presence of Delegation Signer (DS) records... |
| SRG-APP-000268-DNS-000039 | Medium | The DNS server implementation must, when a component failure is detected, activate a notification to the system administrator. | Predictable failure prevention requires organizational planning to address system failure issues. If components key to maintaining systems security fail to function, the system could continue... |
| SRG-APP-000175-DNS-000016 | Medium | The DNS server implementation, when utilizing PKI-based authentication, must validate certificates by constructing a certification path (which includes status information) to an accepted trust anchor. | Without path validation, an informed trust decision by the relying party cannot be made when presented with any certificate not already explicitly trusted.
A trust anchor is an authoritative... |
| SRG-APP-000394-DNS-000049 | Medium | The DNS server implementation must authenticate the other DNS server before responding to a server-to-server transaction. | Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. Device authentication is a solution enabling an organization to manage... |
| SRG-APP-000422-DNS-000055 | Medium | A DNS server implementation must provide additional integrity artifacts along with the authoritative name resolution data the system returns in response to external name/address resolution queries. | The major threat associated with DNS forged responses or failures are the integrity of the DNS data returned in the response. The principle of DNSSEC is to mitigate this threat by providing data... |
| SRG-APP-000439-DNS-000064 | Medium | The key file must be securely transmitted across the network to name servers that will be communicating with the name server that generated the key. | To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key also can be used for securing other... |
| SRG-APP-000439-DNS-000063 | Medium | The DNS server implementation must protect the integrity of transmitted information. | Without protection of the transmitted information, confidentiality and integrity may be compromised since unprotected communications can be intercepted and either read or altered.
Communication... |
| SRG-APP-000421-DNS-000054 | Medium | A DNS server implementation must provide data integrity protection artifacts for internal name/address resolution queries. | The major threat associated with DNS forged responses or failures is the integrity of the DNS data returned in the response. The principle of DNSSEC is to mitigate this threat by providing data... |
| SRG-APP-000095-DNS-000006 | Medium | The DNS server implementation must produce audit records containing information to establish what type of events occurred. | Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being performed on the system, where an event occurred, when an event... |
| SRG-APP-000251-DNS-000037 | Medium | The DNS server implementation must check the validity of all data inputs except those specifically identified by the organization. | Invalid user input occurs when a user inserts data or characters into an application's data entry fields and the application is unprepared to process that data. This results in unanticipated... |
| SRG-APP-000213-DNS-000024 | Medium | A DNS server implementation must provide additional data origin artifacts along with the authoritative data the system returns in response to external name/address resolution queries. | The major threat associated with DNS forged responses or failures is the integrity of the DNS data returned in the response. The principle of DNSSEC is to mitigate this threat by providing data... |
| SRG-APP-000447-DNS-000068 | Medium | The DNS server implementation must behave in a predictable and documented manner that reflects organizational and system objectives when invalid inputs are received. | A common vulnerability of applications is unpredictable behavior when invalid inputs are received. This requirement guards against adverse or unintended system behavior caused by invalid inputs,... |
| SRG-APP-000442-DNS-000067 | Medium | The DNS server implementation must maintain the integrity of information during reception. | Information can be either unintentionally or maliciously disclosed or modified during reception including, for example, during aggregation, at protocol transformation points, and during... |
| SRG-APP-000231-DNS-000033 | Medium | The DNS server implementation must protect the confidentiality and integrity of secret/private cryptographic keys at rest and the integrity of DNS information at rest. | Information at rest refers to the state of information when it is located on a secondary storage device within an organizational information system. Mobile devices, laptops, desktops, and storage... |
| SRG-APP-000219-DNS-000029 | Medium | The DNS implementation must protect the authenticity of communications sessions for dynamic updates. | DNS is a fundamental network service which is prone to various attacks, such as cache poisoning and man-in-the middle attacks. If communication sessions are not provided appropriate validity... |
| SRG-APP-000219-DNS-000028 | Medium | The DNS implementation must protect the authenticity of communications sessions for zone transfers. | DNS is a fundamental network service which is prone to various attacks, such as cache poisoning and man-in-the middle attacks.
If communication sessions are not provided appropriate validity... |
| SRG-APP-000416-DNS-000052 | Medium | The DNS server implementation must utilize NSA-approved cryptography to protect classified information in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards. | Use of weak or untested encryption algorithms undermines the purposes of utilizing encryption to protect data. The application must implement cryptographic modules adhering to the higher standards... |
| SRG-APP-000176-DNS-000018 | Medium | The key file must be owned by the account under which the name server software is run. | To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key can also be used for securing other... |
| SRG-APP-000176-DNS-000019 | Medium | The permission bits must be set so that the key file can be read or modified only by the account that runs the name server software. | To enable zone transfer (requests and responses) through authenticated messages, it is necessary to generate a key for every pair of name servers. The key can also be used for securing other... |
| SRG-APP-000347-DNS-000041 | Medium | The DNS server implementation must strongly bind the identity of the DNS server with the DNS information. | Weakly bound credentials can be modified without invalidating the credential; therefore, non-repudiation can be violated.
This requirement supports audit requirements that provide organizational... |
| SRG-APP-000516-DNS-000108 | Medium | The IP address for hidden master authoritative name servers must not appear in the name servers set in the zone database. | A hidden master authoritative server is an authoritative DNS server whose IP address does not appear in the name server set for a zone. All of the name servers that do appear in the zone database... |
| SRG-APP-000090-DNS-000005 | Medium | The DNS server implementation must allow only the IAM (or individuals or roles appointed by the IAM) to select which auditable events are to be audited. | Only authorized administrators should have access to configure the auditing for the DNS server. Without the capability to restrict which roles and individuals can select which events are audited,... |
| SRG-APP-000142-DNS-000014 | Medium | The DNS server implementation must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the PPSM CAL and vulnerability assessments. | In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must... |
| SRG-APP-000141-DNS-000013 | Medium | The DNS server implementation must be configured to disable non-essential capabilities. | Applications are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational... |
| SRG-APP-000427-DNS-000060 | Medium | If the DNS server is using SIG(0), the DNS server implementation must only allow the use of DoD PKI established certificate authorities for verification of the establishment of protected transactions. | Untrusted Certificate Authorities (CA) can issue certificates, but they may be issued by organizations or individuals that seek to compromise DoD systems or by organizations with insufficient... |
| SRG-APP-000401-DNS-000051 | Medium | The DNS server implementation, for PKI-based authentication, must implement a local cache of revocation data to support path discovery and validation in case of the inability to access revocation information via the network. | Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer authorized (users with revoked certificates).
SIG(0) is used for... |
| SRG-APP-000219-DNS-000030 | Medium | The DNS implementation must protect the authenticity of communications sessions for queries. | The underlying feature in the major threat associated with DNS query/response (i.e., forged response or response failure) is the integrity of DNS data returned in the response. An integral part of... |
| SRG-APP-000098-DNS-000009 | Medium | The DNS server implementation must produce audit records containing information to establish the source of the events. | Without establishing the source of the event, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. Associating information about the source of... |
| SRG-APP-000424-DNS-000057 | Medium | A DNS server implementation must request data integrity verification on the name/address resolution responses the system receives from authoritative sources. | If data origin authentication and data integrity verification is not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been... |
| SRG-APP-000158-DNS-000015 | Medium | The DNS server implementation must uniquely identify the other DNS server before responding to a server-to-server transaction. | Without identifying devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. This applies to server-to-server (zone transfer) transactions only and is... |
| SRG-APP-000218-DNS-000027 | Medium | All authoritative name servers for a zone must be geographically disbursed. | In addition to network-based dispersion, authoritative name servers should be dispersed geographically as well. In other words, in addition to being located on different network segments, the... |
| SRG-APP-000247-DNS-000036 | Medium | The DNS server implementation must manage excess capacity, bandwidth, or other redundancy to limit the effects of information flooding types of Denial of Service (DoS) attacks. | A DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.
In the... |
| SRG-APP-000390-DNS-000048 | Medium | The DNS server implementation must require devices to re-authenticate for each zone transfer and dynamic update request connection attempt. | Without re-authenticating devices, unidentified or unknown devices may be introduced; thereby facilitating malicious activity.
In addition to the re-authentication requirements associated with... |
| SRG-APP-000190-DNS-000022 | Medium | The DNS server implementation must terminate all network connections associated with a communications session at the end of the session, whether successful or unsuccessful. | Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port... |
| SRG-APP-000420-DNS-000053 | Medium | A DNS server implementation must provide data origin artifacts for internal name/address resolution queries. | The major threat associated with DNS forged responses or failures are the integrity of the DNS data returned in the response. The principle of DNSSEC is to mitigate this threat by providing data... |
| SRG-APP-000096-DNS-000007 | Medium | The DNS server implementation must produce audit records containing information to establish when (date and time) the events occurred. | Without establishing when events occurred, it is impossible to establish, correlate, and investigate the events relating to an incident.
Associating event types with detected events in the... |
| SRG-APP-000429-DNS-000062 | Medium | The DNS server implementation must utilize cryptographic mechanisms to prevent unauthorized disclosure of non-DNS data stored on the DNS server. | Applications handling data requiring "data-at-rest" protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest.
Selection of a... |
| SRG-APP-000204-DNS-000023 | Medium | The DNS server implementation must validate the integrity of transmitted security attributes. | Security attributes are values associated with data content/structure and source/destination objects. These attributes are bound to the user and data objects and may include information about the... |
| SRG-APP-000246-DNS-000035 | Medium | The DNS server implementation must restrict the ability of individuals to use the DNS server to launch Denial of Service (DoS) attacks against other information systems. | A DoS is a condition where a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. ... |
| SRG-APP-000097-DNS-000008 | Medium | The DNS server implementation must produce audit records containing information to establish where the events occurred. | Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events relating to an incident. Associating information about where the event occurred... |
| SRG-APP-000023-DNS-000002 | Medium | The DNS server implementation must provide automated mechanisms for supporting account management functions. | As most accounts in the domain name system are privileged or system level accounts, account management and distribution is vital to the security of the DNS implementation and infrastructure. If an... |
| SRG-APP-000426-DNS-000059 | Medium | A DNS server implementation must perform data origin verification authentication on the name/address resolution responses the system receives from authoritative sources. | If data origin authentication and data integrity verification is not performed, the resultant response could be forged, it may have come from a poisoned cache, the packets could have been... |
| SRG-APP-000474-DNS-000073 | Medium | The DNS server implementation must log the event and notify the system administrator when anomalies in the operation of the signed zone transfers are discovered. | Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data... |
