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DS5.10 - Network Security

This topic is intended to enable collaboration and sharing of information to facilitate a better understanding and approach to implementing this COBIT control objective based on the risk, value and guidance provided by its corresponding control practices.

COBIT Control Objective DS5.10 - Network Security is contained within Process Popup Ensure Systems Security.

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Network Security

Use security techniques and related management procedures (e.g., firewalls, security appliances, network segmentation, intrusion detection) to authorise access and control information flows from and to networks.

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Value Drivers

  • Corporate security technology protected
  • Reliable information secured
  • Corporate assets protected
  • Network security managed in a consistent manner
  Risk Drivers
  • Failure of firewall rules to reflect the organisation’s security policy
  • Undetected unauthorised modifications to firewall rules
  • Compromised overall security architecture
  • Security breaches not detected in a timely manner

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  1. Establish, maintain, communicate and enforce a network security policy (e.g., provided services, allowed traffic, types of connections permitted) that is reviewed and updated on a regular basis (at least annually).
  2. Establish and regularly update the standards and procedures for administering all networking components (e.g., core routers, DMZ, VPN switches, wireless).
  3. Properly secure network devices with special mechanisms and tools (e.g., authentication for device management, secure communications, strong authentication mechanisms). Implement active monitoring and pattern recognition to protect devices from attack.
  4. Configure operating systems with minimal features enabled (e.g., features that are necessary for functionality and are hardened for security applications). Remove all unnecessary services, functionalities and interfaces (e.g., graphical user interface [GUI]). Apply all relevant security patches and major updates to the system in a timely manner.
  5. Plan the network security architecture (e.g., DMZ architectures, internal and external network, IDS placement and wireless) to address processing and security requirements. Ensure that documentation contains information on how traffic is exchanged through systems and how the structure of the organisation’s internal network is hidden from the outside world.
  6. Subject devices to reviews by experts who are independent of the implementation or maintenance of the devices.

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Documents & Publications: 105 total

Events & Online Learning: 16 total

Journal Articles: 226 total

Volume 3, 2107
by Jayakumar Sundaram, CISA, ISO 27001 LA
The SoA is a continuously updated and controlled document that provides an overview of information security implementation.
Volume 6, 2106
by Venkatasubramanian Ramakrishnan, CISM, CRISC, CHFI
Bayesian networks can capture the complex interdependencies among risk factors and can effectively combine data with expert judgment.
Volume 2, 2018
by Dan Blum, CISSP
How the digital transformation turns out may depend on how well it supports core values such as prosperity, fairness, integrity, transparency and privacy atop an Internet that erodes some of these values.
Volume 2, 2018
by Ofir Eitan, CISM, CCSK, CTI
In the wake of the Target breach, the threat of cyberattacks using an enterprise’s supply chain as a delivery vector has become a common concern within the information security community.
Volume 2, 2018
by Indrajit Atluri, CRISC, CISM, CISSP, HCISPP, ITILv3
Cyber insurance, along with cyberrisk, has become a very common agenda item on the boardroom discussion list in recent times.
Volume 1, 2018
by Aditya K. Sood, Ph.D., and Rehan Jalil
With the robust requirements listed by upcoming regulations, such as GDPR, the importance of a cloud app security solution cannot be ignored.

Wikis: 2 total

Blog Posts: 58 total

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Posted By : Dragan Pleskonjic | 5 comments
My personal thoughts after listening to C-level executives at the CxO Roundtable Series sponsored by Intel, IBM, HyTrust & ReedSmith. For an invite, please reach out to me. Data Protection under the GDPR For past few months, I’ve been helping to org...
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What do you think: when artificial intelligence (AI) will be smarter than humans? Can you predict it and if yes, when it will approximately happen in your opinion? Vote in poll at link below, please:
Posted By : Dragan Pleskonjic | 2 comments
16 Jan 2018
Is it possible to use crowd-sourced security intelligence to predict future events? For this exercise, experimental web site Security Predictions has been built to harness the ‘wisdom of crowds’....
Posted By : Dragan Pleskonjic | 3 comments
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Posted By : Dragan Pleskonjic | 0 comments
My previous blog under name "Dragan on Security" was at location: It was active from August 28, 2005 to October 3, 2012. By beginning of 2017 it is moved to new location With possibility to...
Posted By : Dragan Pleskonjic | 0 comments