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NSM ICT Security Principles (Norway)
2.5.1: Control data flow between network zones

Requirement description

Control data flow between network zones. a) Use the segmentation in principle 2.2 – Establish a secure ICT architecture to filter legitimate (allowlisted) network traffic between zones and to the internet. The filtering can be based on criteria such as IP address, zone identifier, protocol, application, user etc. b) The rules (incl. changes) for the traffic between the zones should be documented and justified. c) Check regularly that the actual configuration of the data flow is in line with the desired data flow.

How to fill the requirement

NSM ICT Security Principles (Norway)

2.5.1: Control data flow between network zones

Task name
Priority
Status
Theme
Policy
Other requirements
Network segmentation and filtering practices within the classification level
Critical
High
Normal
Low
Fully done
Mostly done
Partly done
Not done
Technical cyber security
Network security
11
requirements

Examples of other requirements this task affects

I02: Verkon vyöhykkeistäminen ja suodatussäännöstöt
Katakri
TEK-02: Tietoliikenne-verkon vyöhykkeistäminen
Julkri
ARCHITECTURE-2: Implement Network Protections as an Element of the Cybersecurity Architecture
C2M2
I-02: VÄHIMPIEN OIKEUKSIEN PERIAATE - TIETOLIIKENNE-VERKON VYÖHYKKEISTÄMINEN JA SUODATUSSÄÄNNÖSTÖT KO. TURVALLISUUSLUOKAN SISÄLLÄ
Katakri 2020
PR.AC-5: Network integrity (network segregation, network segmentation… ) is protected.
CyberFundamentals
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Network segmentation and filtering practices within the classification level
1. Task description

Tietoliikenneverkon vyöhykkeistäminen ja suodatussäännöstöt on toteutettava monitasoisen suojaamisen periaatteen mukaisesti.

Tietoliikenneverkon jakaminen ko. turvallisuusluokan sisällä erillisille verkkoalueille (vyöhykkeet ja segmentit) voi tarkoittaa esimerkiksi tietojen suojaamisen näkökulmasta tarkoituksenmukaista työasema- ja palvelinerottelua, kattaen myös mahdolliset hankekohtaiset erottelutarpeet.

Vaatimus voidaan täyttää alla mainituilla toimenpiteillä:

  • Tietoliikenneverkko on jaettu ko. turvallisuusluokan sisällä erillisiin verkko-alueisiin (vyöhykkeet, segmentit).
  • Verkkoalueiden välistä liikennettä rajoitetaan ja ympäristöön sisäänpäin tulevaan liikenteeseen noudatetaan default-deny sääntöä.
  • Tietojenkäsittely-ympäristössä on varauduttu yleisiin verkkohyökkäyksiin.
Documenting and managing the firewall administration policies
Critical
High
Normal
Low
Fully done
Mostly done
Partly done
Not done
Technical cyber security
Network security
9
requirements

Examples of other requirements this task affects

FWL-02: Documenting and managing the firewall administration policies
Cyber Essentials
PR.AC-5: Network integrity (network segregation, network segmentation… ) is protected.
CyberFundamentals
2.4.1: Establish access control on as many network ports as possible
NSM ICT-SP
2.5.7: Maintain control of data flow between the organisation and its partners / service providers
NSM ICT-SP
2.4.4: Activate firewall on all clients and servers
NSM ICT-SP
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Documenting and managing the firewall administration policies
1. Task description

The organisation must have the following firewall rules configured and documented:

  • Firewall will by default block inbound connections
  • Firewall rules are accepted and documented by appropriate and authorized individual; the business need must be included in the documentation
  • Permissive firewall rules must be removed or disabled quickly when no longer needed
Monitoring configurations
Critical
High
Normal
Low
Fully done
Mostly done
Partly done
Not done
Technical cyber security
Network security
10
requirements

Examples of other requirements this task affects

8.9: Configuration management
ISO 27001
1.2.4: Definition of responsibilities with service providers
TISAX
DE.CM-7: Monitoring for unauthorized personnel, connections, devices, and software is performed.
CyberFundamentals
2.5.1: Control data flow between network zones
NSM ICT-SP
2.3.5: Verify that activated security configurations comply with the organisation’s approved security configurations
NSM ICT-SP
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Monitoring configurations
1. Task description

Configurations should be monitored with comprehensive system management tools (e.g. maintenance utilities, remote support, enterprise management tools, backup and recovery software) and reviewed regularly to assess settings, password strengths, and operations performed. Actual configurations can be compared to defined target models. Any discrepancies must be dealt with either automatically or by manual processing.

Any unauthorized changes must be corrected and cause investigated and reported.

Tasks included in the policy

Task name
Priority
Status
Theme
Policy
Other requirements
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