How to Protect Your Company Intranet from External Threats

intranet security
intranet security
intranet security

In today’s digital landscape, internal website security, or intranet security, is paramount for organisations. With the growing reliance on digital tools and data sharing within a company’s network, safeguarding sensitive information has become crucial.

Intranets serve as the backbone of internal communication, collaboration, and data storage, making them a treasure trove of valuable data. Therefore, ensuring the security of these internal digital ecosystems is imperative to protect against external threats and maintain the trust of clients and employees alike.

In the following sections, we will explore the various aspects of intranet security, exploring common threats and the best practices to safeguard your organisation’s internal website.

Increasing external threats faced by company intranets.

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In recent years, company intranets have faced a surge in external threats that pose significant risks to the security and confidentiality of sensitive information. 

These threats have evolved in complexity and sophistication, making robust intranet security measures more critical than ever. Here, we highlight some of the increasing external threats faced by company intranets:

  • Cyberattacks: Cybercriminals continuously develop new techniques to breach intranet security. These may include malware, ransomware, and phishing attacks that target vulnerabilities within the network.
  • Data Breaches: External actors often seek unauthorised access to steal, leak, or exploit sensitive data stored on intranets. Data breaches can result in severe financial and reputational damage.
  • DDoS Attacks: Distributed Denial of Service (DDoS) attacks aim to overwhelm intranet servers with excessive traffic, rendering them inaccessible. These attacks disrupt operations and can lead to data loss.
  • Social Engineering: Phishing attacks, a form of social engineering, trick users into revealing confidential information. These attacks can compromise intranet security by exploiting human vulnerabilities.
  • Third-Party Risks: External vendors and partners connected to the intranet may inadvertently introduce security vulnerabilities. Attackers can exploit weaknesses in third-party applications or services.
  • Mobile Device Vulnerabilities: With the increasing use of mobile devices to access intranets remotely, vulnerabilities in these devices can be exploited to gain unauthorised access to the network.
  • Insider Threats: While often considered internal, insider threats can also have external dimensions. Disgruntled employees or contractors may collude with external actors to compromise intranet security.

As these external threats evolve, organisations must implement robust security measures to protect their company intranets effectively. The following sections will explore best practices and strategies to safeguard against these growing challenges.

Common Vulnerabilities Exploited by External Threats

External threats leverage vulnerabilities within a company’s intranet to gain unauthorised access, disrupt operations, or compromise sensitive data. 

Recognising and addressing these vulnerabilities is essential for bolstering intranet security. Here are some of the most common vulnerabilities that external threats exploit:

  • Weak Passwords: Inadequate password policies and the use of easily guessable or commonly used passwords can provide a gateway for attackers. They may use techniques like brute-force attacks to crack weak passwords.
  • Unpatched Software: Failure to regularly update and patch intranet software and applications can leave known vulnerabilities open to exploitation. Attackers often target outdated software. This is especially true when you are using on-premises intranet software.
  • Insufficient Access Controls: Inadequate role-based permissions and access controls can allow unauthorised users to view, edit, or delete critical data. Attackers may exploit these gaps to gain access.
  • Unencrypted Data: Lack of encryption for data at rest and in transit can expose sensitive information to interception or theft. Data encryption is essential to protect against eavesdropping attacks.
  • Lax Mobile Device Security: The increasing use of mobile devices to access intranets, insecure device configurations, and missing security updates can make these devices vulnerable to external threats.
  • Third-Party Integration Issues: Integrating third-party tools or services with the intranet can introduce vulnerabilities if those services are not adequately secured. Attackers may target these weak points.
  • Insufficient Employee Training: Employees lacking security awareness may fall victim to phishing or social engineering attacks. Education and training are crucial to prevent such breaches.
  • Inadequate Network Monitoring: Failing to monitor intranet traffic and system logs can delay the detection of suspicious activities or breaches, giving attackers more time to operate undetected.
  • No DDoS Mitigation Plan: Without proper Distributed Denial of Service (DDoS) mitigation strategies and tools, intranets can become easy targets for disruptive attacks that overwhelm servers.
  • Unpatched Vulnerabilities in Third-Party Applications: Vulnerabilities in third-party applications integrated into the intranet can be exploited by attackers if these applications are not regularly updated and secured.
  • Weak Email Security: Inadequate email security measures can expose employees to phishing attacks that aim to compromise intranet credentials.

Effective Security Measures to protect intranet against external threats

Securing your intranet from external threats is paramount for safeguarding sensitive data and maintaining operational integrity. 

Implementing a comprehensive security strategy is crucial. Here are some effective security measures to protect your intranet:

  • Strong Authentication: Enforce strong password policies, two-factor authentication (2FA), and single sign-on (SSO) to enhance user authentication. Implement regular password changes and ensure that default passwords are never used.
  • Access Controls: Implement role-based access controls (RBAC) to restrict access to sensitive data. Only authorised users should have access to specific information or features within the intranet.
  • Regular Updates and Patching: Keep all software, including the intranet platform and third-party applications, updated with security patches. Vulnerabilities in outdated software are a common target for attackers.
  • Data Encryption: Encrypt data both at rest and in transit. Use secure protocols like SSL/TLS for data in transit and technologies like BitLocker for data at rest.
  • Mobile Device Management (MDM): Implement MDM solutions to manage and secure mobile devices accessing the intranet, including remote wipe capabilities for lost or stolen devices.
  • Third-Party Integration Security: Vet third-party applications and services thoroughly for security before integration. Regularly assess their security posture and ensure they meet your organisation’s standards.
  • Employee Training: Conduct regular security awareness training for employees to educate them about phishing, social engineering, and safe browsing practices. Ensure they understand the importance of security.
  • Network Monitoring: Deploy intrusion detection systems (IDS) and intrusion prevention systems (IPS) to monitor network traffic for suspicious activities. Log and analyse events to detect anomalies.
  • Firewalls and Load Balancers: Utilize firewalls to filter incoming traffic and load balancers to distribute it evenly. This can help protect against DDoS attacks and unauthorised access.
  • Phishing Protection: Use email filtering solutions to identify and block phishing attempts. Train employees to recognise phishing emails and report them promptly.
  • Incident Response Plan: Develop an incident response plan to address security breaches promptly. Define roles, responsibilities, and communication procedures for handling security incidents.
  • Regular Security Audits: Conduct security audits and penetration testing to identify vulnerabilities. Remediate any issues promptly.
  • Backup and Recovery: Implement robust backup and disaster recovery plans to ensure data can be restored in case of a security incident. Test these plans regularly.
  • Vendor Security Assessment: Assess the security of vendors and service providers accessing your intranet. Ensure they comply with your security standards.
  • User Behavior Analytics (UBA): Employ UBA tools to monitor user behaviour and detect anomalies that could indicate a security threat.
  • Security Information and Event Management (SIEM): Implement SIEM solutions to centralise and analyse security event data for real-time threat detection and response.
  • Regular Security Updates: Stay informed about the latest security threats and vulnerabilities. Apply relevant security updates promptly.
  • Employee Exit Procedures: Implement procedures to revoke access for employees who leave the organisation to prevent unauthorised access.

Importance of role-based permissions and user training.

Role-based permissions and user training are critical to safeguarding your intranet from external threats. Here’s why they are of paramount importance:

Role-Based Permissions:

  • Data Segmentation: Role-based permissions ensure that individuals have access only to the information necessary for their job roles, preventing unauthorised access to sensitive data. For example, HR staff should not have access to financial records, and vice versa.
  • Minimised Insider Threats: Even within your organisation, not all employees should have the same level of access. Role-based permissions reduce the risk of insider threats by limiting access to sensitive data or critical systems.
  • Regulatory Compliance: Many industries have strict regulatory requirements governing data access. Role-based permissions help organisations comply with these regulations by controlling who can access sensitive data.
  • Response to Staff Changes: When employees change roles or leave the organisation, role-based permissions make it easier to adjust access rights accordingly, reducing the chances of former employees retaining unauthorised access.

User Training:

  • Phishing Awareness: Phishing attacks are a common entry point for external threats. User training educates employees about recognising phishing attempts and avoiding falling victim to them. This awareness is a potent defence.
  • Password Security: Weak passwords are a significant vulnerability. Training can encourage employees to create strong, unique passwords and to change them regularly. They should also understand the importance of not sharing passwords.
  • Safe Browsing Practices: Users should be trained to avoid suspicious websites, not download files from untrusted sources, and be cautious with email attachments. Many external threats originate from seemingly innocuous online activities.
  • Mobile Device Security: In today’s mobile workforce, securing devices is crucial. Training can teach employees how to connect their mobile devices and avoid risks associated with using them to access the intranet remotely.
  • Reporting Suspicious Activity: Employees should know how and where to report suspicious activities or potential security incidents. Early reporting can help IT teams respond swiftly to threats.
  • Data Handling Best Practices: User training should cover how to handle and store sensitive data securely, including encryption, data sharing restrictions, and secure disposal of physical documents.
  • Compliance Education: Some industries have specific compliance requirements related to security. User training ensures that employees understand these requirements and know how to adhere to them.

Real-World Examples of External Security Attacks on Intranets and Their Consequences

2014 Cyberattack

In 2014, a hacker group targeted a major entertainment company. They breached the company’s network, accessing sensitive employee data, internal emails, and unreleased content. The attackers demanded that the company cancel the release of a particular movie. This breach resulted in significant financial losses, damaged the company’s reputation, and underscored the importance of robust intranet security.

2017 Data Breach

 A significant data breach occurred in 2017 when cybercriminals exploited a vulnerability in a major credit reporting agency’s website application. The breach exposed millions of consumers’ personal and financial information, leading to legal repercussions, financial penalties, and a loss of public trust.

2019 Cyber Incident

In 2019, an individual with inside knowledge exploited a vulnerability in a company’s servers, gaining unauthorised access to the personal information of many customers. This breach resulted in substantial financial costs, legal settlements, and reputational damage.

2020 Supply Chain Attack

A supply chain attack occurred in 2020 when attackers compromised the software updates of a prominent IT management company, allowing them to infiltrate numerous organisations, including government agencies and major corporations. The consequences included compromised security, extensive investigations, and heightened awareness of supply chain security risks.

2021 Ransomware Attack

A ransomware attack in 2021 disrupted critical infrastructure services. Attackers exploited vulnerabilities in the targeted organisation’s network. The incident led to operational disruptions, financial losses, and regulatory scrutiny, highlighting the importance of securing vital systems.


Safeguarding your company’s intranet from external threats is not merely a choice; it’s imperative to maintain operational continuity, protect sensitive data, and uphold your organisation’s reputation. As demonstrated by real-world examples, the consequences of security breaches can be devastating, leading to financial losses, legal repercussions, and damage to brand trust.

Adopting proactive security measures ensures your intranet remains resilient against external attacks. These measures encompass robust firewalls, intrusion detection systems, regular vulnerability assessments, and timely software updates. Moreover, role-based permissions and ongoing employee training are essential to a comprehensive security strategy.

Organisations must stay vigilant and adaptive as the threat landscape continues to evolve. Investing in the right security tools, maintaining a security-first culture, and learning from past incidents can fortify your company’s intranet against external threats, enabling your business to thrive in an increasingly digital world. Remember, your intranet’s security is an investment in your organisation’s future, safeguarding its integrity and ensuring peace of mind for all stakeholders.

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