What is Network Security 

Gartner defines network security as “the measures taken to protect a communications pathway from unauthorized access to, and accidental or willful interference of, regular operations”. In simple, it means protecting the network from cyberattacks.

Network security involves a wide range of strategies from hardware to software, firewalls, intrusion detection systems (IDS), security protocols, and others.

Why Network Security is Important?

The importance of network security cannot be overstated. A breach in the network can cause devastating consequences for an organization from financial loss to reputational damage. Around 52% of malware can evade network security measures and only 4% of the organization considers their devices connected to the internet are fully secure. These stats highlight the importance of network security but also show how often it is underestimated. 

Here are some of the reasons why network security is important:

  • Data privacy: Organizations are now handling huge amounts of sensitive data from PII (Personally identifiable information) to intellectual property. Network security only ensures that this data is protected from unauthorized access. 
  • Business Continuity: A breach in the network can disrupt business operations which directly affects an organization’s revenue and reputation. For instance, ransomware attacks can lock critical files and render them useless crippling an organization’s ability to function. Proper network security measures can reduce downtime and even prevent the lateral movement of attackers in the network.
  • Compliance: Many organizations are obliged to comply with various regulations and compliance which cover certain areas in network security too. For example, PCI DSS has a specific requirement related to networks which mandates the organizations to install firewalls and more.
  • Financial Impact: Organizations need significant costs to recover from cyberattacks, which can be financially devastating. The costs associated include legal fees, regulatory fines, and remediation efforts. Strong network security reduces the risk of these unwanted financial repercussions.

Common Network Security Threats

Understanding the common network security threats is crucial for building an effective multi-layer cyber defense strategy. Below are some of the common security threats that a network needs to withstand:

Malware

Malware is software designed to do malicious work in the network. Types of malware include viruses, worms, trojans, ransomware, etc. Among all these ransomware attacks alone constitute 35% of overall cyberattacks with a whopping 84% increase over last year.

Solutions

  • Use Antivirus solutions: Keep anti-virus software updated to detect and mitigate known malware.
  • Employee Education: Train employees to recognize suspicious movements or changes in the network to prevent accidental malware infection.
  • Network Segmentation: Isolate critical systems from the rest of the network to limit the spread of malware. 
  • XDR(Managed Detection and Response): XDR solutions can even detect malware based on its movements, network traffic, and other factors.

DDoS(Distributed Denial-of-Service) Attack

In a DDoS attack, the attackers overwhelm the entire network with excess traffic, making it unusable to legitimate users. It is dangerous and can disrupt business operations if an organization gets targeted. For instance, during the Israel-Hamas war, Israeli websites got flooded with 1 million requests per second for six minutes.

Solutions

  • Traffic filtering: Use web application firewalls to filter out malicious traffic while allowing legitimate traffic to pass through.
  • Rate Limiting: Apply rate limits to incoming traffic to prevent overload and even block suspicious IP addresses that are sending huge requests.

Man-in-the-Middle(MiTM) Attacks

The attacker secretly intercepts the network and alters communication between two networks or parties.

Solutions

  • Use Strong Encryption: Ensure that data is encrypted during transmission(eg use SSL/TLS for web traffic).
  • Multi-Factor Authentication (MFA): Implement MFA to prevent unauthorized access to systems, even if communications are intercepted, attackers cannot gain access.
  • Secure Wi-Fi Networks: Ensure that wi-fi networks are secured with strong credentials and WPA3 or at least WPA2 to prevent attackers from gaining access.

4. SQL-Injection

SQL-injection occurs when threat actors exploit vulnerabilities in a web application’s database query processing. By inserting harmful and malicious SQL code, the attacker can gain unauthorized access to the database, steal data, or even delete it.

Solutions

  • Input Validation: Always validate and sanitize user inputs, ensuring don’t contain malicious SQL code.
  • Limit Database Permissions: Restrict database access to only administrators and necessary users to ensure that attackers cannot gain full control over the entire database.

How to Implement Network Security

To protect your network, a multi-layer security strategy is non-negotiable. Here’s a simple step-by-step example of how network security is implemented.

Step 1:Identify Assets

The first step is to identify all the digital assets in your organization’s IT infrastructure that are connected to the Internet. This should include all devices, from servers to employee mobiles, that store or access the organization’s data.

Step 2:Risk Profile

Integrating threat intelligence and classifying assets based on their exposure to cyber threats is critical for implementing effective network security. For instance, government contractors and defense industries are often targeted by advanced persistent threats(APT), designed to steal sensitive information. Threat intelligence helps to identify these risks and identify areas that need to be protected.

Step 3:Drafting Network Security Policy

Once organizations identify the assets and their risks, the security team must draft a network policy. This policy should outline the organization’s approach to securing its network, ensuring that all employees and stakeholders follow those practices to safeguard the network. A well-crafted network security policy should align with the organization’s overall business needs, risk tolerance, and regulatory requirements such as access control, data protection, incident response, etc.

Related Reading: How to Perform a Comprehensive Network Security Audit

Step 4:Plan into Action

The final step is to implement the network security policy. This involves deploying all the tools and configurations in the network. To ensure a smooth and successful implementation, organizations should train their employees on network policy and create a timeline to implement it properly.

Conclusion

Network is the main target for threat actors and organizations must protect it with all means to reduce the risk of cyberattacks. With the increase in sophistication of cyber threats and attack methodology, it is crucial to continuously update the network security measures to stay ahead of threat actors.