Title

The HYCU virtual appliance must be configured to prohibit the use of all unnecessary and/or nonsecure functions, ports, protocols, and/or services. (Cat I impact)

Discussion

To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable unused or unnecessary physical and logical ports/protocols on information systems. Network devices 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 operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., email and web services); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the network device must support the organizational requirements providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved. Some network devices have capabilities enabled by default; if these capabilities are not necessary, they must be disabled. If a particular capability is used, then it must be documented and approved.

Check Content

Verify the SSHD daemon has been disabled using the following command: $ sudo systemctl status sshd Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled) Active: inactive (dead) If the SSHD daemon is not disabled and inactive or is not documented and approved for use, this is a finding.

Fix Text

Stop the SSHD daemon using the following command: $ sudo systemctl stop sshd Disable the SSHD daemon using the following command: $ sudo systemctl disable sshd Note: The service must be stopped before it can be disabled.

Additional Identifiers

Rule ID: SV-268259r1038477_rule

Vulnerability ID: V-268259

Group Title: SRG-APP-000142-NDM-000245

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.