Guide to the Secure Configuration of Red Hat Enterprise Linux 8
Rules, Groups, and Values defined within the XCCDF Benchmark
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Disable DHCP Client in ifcfg
For each interface on the system (e.g. eth0), edit <code>/etc/sysconfig/network-scripts/ifcfg-<i>interface</i></code> and make the following change...Rule Unknown Severity -
Disable DHCP Server
The DHCP server <code>dhcpd</code> is not installed or activated by default. If the software was installed and activated, but the system does not n...Group -
Uninstall DHCP Server Package
If the system does not need to act as a DHCP server, the dhcp package can be uninstalled. The <code>dhcp-server</code> package can be removed with...Rule Medium Severity -
Disable DHCP Service
The <code>dhcpd</code> service should be disabled on any system that does not need to act as a DHCP server. The <code>dhcpd</code> service can be ...Rule Medium Severity -
DNS Server
Most organizations have an operational need to run at least one nameserver. However, there are many common attacks involving DNS server software, a...Group -
Disable DNS Server
DNS software should be disabled on any systems which does not need to be a nameserver. Note that the BIND DNS server software is not installed on R...Group -
Uninstall bind Package
The <code>named</code> service is provided by the <code>bind</code> package. The <code>bind</code> package can be removed with the following comman...Rule Low Severity -
Disable named Service
Thenamedservice can be disabled with the following command:$ sudo systemctl mask --now named.service
Rule Medium Severity -
Isolate DNS from Other Services
This section discusses mechanisms for preventing the DNS server from interfering with other services. This is done both to protect the remainder of...Group -
Run DNS Software in a chroot Jail
Install the <code>bind-chroot</code> package: <pre>$ sudo yum install bind-chroot</pre> Place a valid named.conf file inside the chroot jail: <pre>...Group -
Run DNS Software on Dedicated Servers
Since DNS is a high-risk service which must frequently be made available to the entire Internet, it is strongly recommended that no other services ...Group -
Protect DNS Data from Tampering or Attack
This section discusses DNS configuration options which make it more difficult for attackers to gain access to private DNS data or to modify DNS data.Group -
Authenticate Zone Transfers
If it is necessary for a secondary nameserver to receive zone data via zone transfer from the primary server, follow the instructions here. Use dn...Rule Medium Severity -
Disable Dynamic Updates
Is there a mission-critical reason to enable the risky dynamic update functionality? If not, edit <code>/etc/named.conf</code>. For each zone speci...Rule Unknown Severity -
Disable Zone Transfers from the Nameserver
Is it necessary for a secondary nameserver to receive zone data via zone transfer from the primary server? If not, follow the instructions in this...Rule Unknown Severity -
Use Views to Partition External and Internal Information
If it is not possible to run external and internal nameservers on separate physical systems, run BIND9 and simulate this feature using views. Edit ...Group -
Run Separate DNS Servers for External and Internal Queries
Is it possible to run external and internal nameservers on separate systems? If so, follow the configuration guidance in this section. On the exter...Group -
Docker Service
The docker service is necessary to create containers, which are self-sufficient and self-contained applications using the resource isolation fe...Group -
Enable the File Access Policy Service
The File Access Policy service should be enabled. The <code>fapolicyd</code> service can be enabled with the following command: <pre>$ sudo system...Rule Medium Severity -
Configure Fapolicy Module to Employ a Deny-all, Permit-by-exception Policy to Allow the Execution of Authorized Software Programs.
The Fapolicy module must be configured to employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs and ...Rule Medium Severity
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