I - Mission Critical Classified
Rules and Groups employed by this XCCDF Profile
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SRG-APP-000516-DNS-000099
<GroupDescription></GroupDescription>Group -
The permissions assigned to the core BIND 9.x server files must be set to utilize the least privilege possible.
<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-000091
<GroupDescription></GroupDescription>Group -
On a BIND 9.x server 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.
<VulnDiscussion>Authoritative name servers for an enterprise may be configured to receive requests from both external and internal clients. ...Rule Medium Severity -
SRG-APP-000516-DNS-000092
<GroupDescription></GroupDescription>Group -
On a BIND 9.x server 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.
<VulnDiscussion>Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two d...Rule Medium Severity -
SRG-APP-000516-DNS-000093
<GroupDescription></GroupDescription>Group -
On a BIND 9.x server 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.
<VulnDiscussion>Instead of having the same set of authoritative name servers serve different types of clients, an enterprise could have two d...Rule Medium Severity -
SRG-APP-000516-DNS-000101
<GroupDescription></GroupDescription>Group -
A BIND 9.x server implementation must implement internal/external role separation.
<VulnDiscussion>DNS servers with an internal role only process name/address resolution requests from within the organization (i.e., internal ...Rule High Severity -
SRG-APP-000516-DNS-000108
<GroupDescription></GroupDescription>Group -
On the BIND 9.x server the IP address for hidden master authoritative name servers must not appear in the name servers set in the zone database.
<VulnDiscussion>A hidden master authoritative server is an authoritative DNS server whose IP address does not appear in the name server set f...Rule Medium Severity -
SRG-APP-000516-DNS-000500
<GroupDescription></GroupDescription>Group -
A BIND 9.x implementation operating in a split DNS configuration must be approved by the organizations Authorizing Official.
<VulnDiscussion>BIND 9.x has implemented an option to use "view" statements to allow for split DNS architecture to be configured on a single ...Rule High Severity -
SRG-APP-000516-DNS-000111
<GroupDescription></GroupDescription>Group -
On the BIND 9.x server the private key corresponding to the ZSK, stored on name servers accepting dynamic updates, must be owned by root.
<VulnDiscussion>The private ZSK key must be protected from unauthorized access. This strategy is not feasible in situations in which the DNS...Rule Medium Severity -
SRG-APP-000516-DNS-000111
<GroupDescription></GroupDescription>Group -
On the BIND 9.x server the private key corresponding to the ZSK, stored on name servers accepting dynamic updates, must be group owned by root.
<VulnDiscussion>The private ZSK key must be protected from unauthorized access. This strategy is not feasible in situations in which the DNS...Rule Medium Severity -
SRG-APP-000215-DNS-000003
<GroupDescription></GroupDescription>Group -
A BIND 9.x server implementation must enforce approved authorizations for controlling the flow of information between authoritative name servers and specified secondary name servers based on DNSSEC policies.
<VulnDiscussion>A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design...Rule Medium Severity
Node 2
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