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Cybersecurity Fundamentals
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PR.AC-1 PR.AC-2 PR.AC-3 PR.AC-4 PR.AC-5 PR.AC-6 PR.AC-7
Maturity Level 1
Maturity Level 2
Maturity Level 3
PR.AC-5.1
PR.AC-5.1: Firewalls shall be installed and activated on all the organization's networks.
  • Consider the following:
  • Install and operate a firewall between your internal network and the Internet. This may be a function of a (wireless) access point/router, or it may be a function of a router provided by the Internet Service Provider (ISP).
  • Ensure there is antivirus software installed on purchased firewall solutions and ensure that the administrator’s log-in and administrative password is changed upon installation and regularly thereafter.
  • Install, use, and update a software firewall on each computer system (including smart phones and other networked devices).
  • Have firewalls on each of your computers and networks even if you use a cloud service provider or a virtual private network (VPN). Ensure that for telework home network and systems have hardware and software firewalls installed, operational, and regularly updated.
  • Consider installing an Intrusion Detection / Prevention System (IDPS). These devices analyze network traffic at a more detailed level and can provide a greater level of protection.
Documentation Maturity
Not applicable - Not applicable in the selected scope.
Level 1 - Initial - No Process documentation or not formally approved by management.
Level 2 - Repeatable - Formally approved Process documentation exists but not reviewed in the previous 2 years.
Level 3 - Defined - Formally approved Process documentation exists, and exceptions are documented and approved. Documented and approved exceptions < 5% of the time.
Level 4 - Managed - Formally approved Process documentation exists, and exceptions are documented and approved. Documented and approved exceptions < 3% of the time.
Level 5 - Optimizing - Formally approved Process documentation exists, and exceptions are documented and approved. Documented and approved exceptions < 0,5% of the time.
Implementation Maturity
Not applicable - Not applicable in the selected scope.
Level 1 - Initial - Standard process does not exist.
Level 2 - Repeatable - Ad-hoc process exists and is done informally.
Level 3 - Defined - Formal process exists and is implemented. Evidence available for most activities. Less than 10% process exceptions.
Level 4 - Managed - Formal process exists and is implemented. Evidence available for all activities. Detailed metrics of the process are captured and reported. Minimal target for metrics has been established. Less than 5% of process exceptions.
Level 5 - Optimizing - Formal process exists and is implemented. Evidence available for all activities. Detailed metrics of the process are captured and reported. Minimal target for metrics has been established and continually improving. Less than 1% of process exceptions.
Description

Firewalls shall be installed and activated on all the organization's networks.

PR.AC-5.2
PR.AC-5.2: Where appropriate, network integrity of the organization's critical systems shall be protected by incorporating network segmentation and segregation.
  • Consider creating different security zones in the network (e.g. Basic network segmentation through VLAN’s or other network access control mechanisms) and control/monitor the traffic between these zones.
  • When the network is "flat", the compromise of a vital network component can lead to the compromise of the entire network.
Documentation Maturity
Not applicable - Not applicable in the selected scope.
Level 1 - Initial - No Process documentation or not formally approved by management.
Level 2 - Repeatable - Formally approved Process documentation exists but not reviewed in the previous 2 years.
Level 3 - Defined - Formally approved Process documentation exists, and exceptions are documented and approved. Documented and approved exceptions < 5% of the time.
Level 4 - Managed - Formally approved Process documentation exists, and exceptions are documented and approved. Documented and approved exceptions < 3% of the time.
Level 5 - Optimizing - Formally approved Process documentation exists, and exceptions are documented and approved. Documented and approved exceptions < 0,5% of the time.
Implementation Maturity
Not applicable - Not applicable in the selected scope.
Level 1 - Initial - Standard process does not exist.
Level 2 - Repeatable - Ad-hoc process exists and is done informally.
Level 3 - Defined - Formal process exists and is implemented. Evidence available for most activities. Less than 10% process exceptions.
Level 4 - Managed - Formal process exists and is implemented. Evidence available for all activities. Detailed metrics of the process are captured and reported. Minimal target for metrics has been established. Less than 5% of process exceptions.
Level 5 - Optimizing - Formal process exists and is implemented. Evidence available for all activities. Detailed metrics of the process are captured and reported. Minimal target for metrics has been established and continually improving. Less than 1% of process exceptions.
Description

Where appropriate, network integrity of the organization's critical systems shall be protected by incorporating network segmentation and segregation.