Virtual Private Networks (VPNs) and firewalls are two of the most common and vital cybersecurity tools. Both security tools defend against external threats. However, they use different methods and play complementary roles.

If you are confused about VPNs and next-generation firewalls (NGFWs), now is the perfect time to learn. This blog will introduce firewalls and VPNs and help you choose the correct security measures for your business network.

What is a firewall and how does it work?

A firewall is a security tool that filters traffic at the network perimeter.

Pre-defined rules allow or deny traffic at the network edge. Deny and allow rules work in tandem to protect network assets and optimize performance.

Firewall users start with default actions applying to all traffic. Users then specify controls as needed by creating new rules. This provides flexibility to allow or deny access.Traditional firewalls analyze data packets before they reach network devices (or leave corporate networks). Businesses can implement them as hardware devices or choose as a software firewall installed on network servers.

Whatever style you choose, firewalls have significant security benefits. Business advantages include:

• Perimeter security: Companies can set rules to admit only authorized identities to access specific environments or services. Employees or trusted partners can access network resources relevant to their roles. The firewall enforces these rules, limiting or completely denying access to other resources, both to insiders and outsiders. This way, the firewall ensures that insiders have specific access rights based on what they need or don’t need for their role.”

• Content filtering: DNS-level firewalls can filter web traffic and block undesirable websites without compromising performance. Firewalls create segmented zones throughout the network where content is tightly controlled, ensuring different departments have appropriate access. For instance, social media may be restricted, but the marketing department could retain access if needed. Firewalls can also block the transmission of document formats or executable files, cutting the risk of phishing attacks.

Firewall capabilities vary, and companies must pick a solution to suit their security needs.

Basic firewalls assess surface information like IP address data. Stateful firewalls use contextual information to discover malicious traffic. Next-generation firewalls (NGFWs) are more powerful, adding capabilities like Deep Packet Inspection, sandboxing, and AI-powered application awareness.

Finally, cloud firewalls take NGFW functions and apply them to virtualized environments. These software firewalls reside in cloud environments but aren’t limited to SaaS security. Cloud firewalls are fully compatible with both physical and cloud-based networks, making them ideal for hybrid environments. They provide all-around protection, handling all firewall needs across various infrastructures.

What is a VPN and how does it work?

A Virtual Private Network encrypts data as it passes between your device and the VPN server, securing it across the internet. VPNs anonymize traffic by assigning data packets new IP addresses. End-to-end encrypted tunnels work with IP address reassignment to mask your identity. VPNs hide your browsing history from ISPs and enable organizations to test localized content and campaigns in different virtual locations conveniently.

VPN users install client software on their devices. Clients encrypt data and establish connections with VPN servers, which assign IP addresses. The server then routes traffic to its destination via the standard internet service provider.

VPNs became famous as individual users sought to evade geo-blockers and government censorship. However, nowadays, businesses use VPNs not only to secure network traffic but also to test localized content and campaigns in different virtual locations conveniently.

Benefits of using a VPN for business include:

• Secure remote access: Remote workers may send confidential data via public Wi-Fi or other unprotected networks, such as those in cafes, airports, or conferences. These are highly vulnerable environments, making VPNs mandatory to prevent man-in-the-middle attacks, which can lead to network breaches and sensitive data leaks. A remote access VPN secures remote connections, ensuring data safety while employees maintain flexibility.

  However, a simple business VPN alone may not be enough to ensure secure access and file transmission. Advanced VPN features, such as site-to-site or Smart Remote Access (SRA), provide stronger security.

  Additionally, advanced configurations can offer a unified IP address for the entire organization, simplifying IP allowlisting and enhancing network and resource access security.

• Safe file transmission: Companies often send sensitive documents and assets to partners and clients. More advanced VPN providers enable secure file transmission. Site-to-site encryption and SRA protect confidential data while making it available to relevant users.

• Unified IP addresses. Advanced VPN configurations provide a unified IP address for the entire organization. This makes IP allowlisting possible and easy to manage and use. Allowlisting increases network and resource access security.

Differences between firewalls and VPNs

The main difference between firewalls and VPNs is that firewalls filter traffic at the network edge. On the other hand, Virtual Private Networks create a secure connection over the external internet.

Imagine a medieval castle. Firewalls defend your castle, only admitting friends. VPNs are like armor, protecting knights outside the walls as they carry messages throughout the land.

Beyond that general distinction, differences between firewalls and VPNs include:

• VPNs protect your privacy while sending and receiving data. Firewalls block malicious or suspect traffic, but they do not encrypt or anonymize traffic.

• VPNs use end-to-end encryption, which conceals the contents of data packets. Traditional firewalls don’t encrypt data; they only track and filter traffic according to firewall rules.

• Advanced next-generation firewalls (NGFWs) can detect malware before it enters the network, while VPNs do not actively scan for cyber threats.

• Firewalls enhance network security not only by handling external threats but also by controlling access to prevent internal threats. They stop lateral movement across the network and help prevent accidental data leaks. VPNs make data transfers more secure.

When to use a VPN vs. a firewall

Firewalls and VPNs have different use cases. Knowing how and when to use them effectively is critically important.

Use a Virtual Private Network when you:

• Need to secure remote access connections over public networks. VPNs allow secure connections from public Wi-Fi and home offices.

• Need to secure file transfers across the internet. Encrypted tunnels ensure that the transfer channels remain secure and confidential, preventing unauthorized access. This means that VPNs protect the transfer channels and do not act as a method for sending files.

• Worry about corporate espionage or surveillance. With a VPN, outsiders cannot monitor your online activity.

• Need to connect different work locations. Site-to-site VPN services securely connect distant offices, factories, or stores.

Use a firewall when you:

• Need to apply network segmentation to protect critical assets.

• Need to filter traffic entering or leaving your network.

• Need to implement access control lists and exclude unauthorized users or devices.

• Have specific content filtering needs. For example, schools may want to block any adult content at the network edge.

Firewall vs. VPN: does your business need both?

Firewalls and VPNs are different tools. However, the firewall versus VPN division is misleading. In most instances, using both will enhance your network security.

Firewalls provide a first line of defense to filter traffic entering and leaving the network. They detect malware, identify unauthorized access requests, and control the flow of sensitive data.

VPNs supplement these firewall functions. They hide user IP addresses and encrypt data, complicating life for external attackers. With a dependable Virtual Private Network, your data will remain private as it passes from remote work locations to central offices.

Firewalls police the boundary of your network. They exclude threats before they can cause harm. VPNs extend protection outside the network perimeter. Users can browse the web without adding extra cybersecurity risks.

Enhance your security with NordLayer’s business VPN and cloud firewall

Traditional firewalls don’t work well in modern business contexts. The rise of the cloud complicates cybersecurity. Data no longer resides locally, and employees access resources from many locations

NordLayer provides a comprehensive solution that adapts to your business needs. Whether you need a simple VPN, a site-to-site VPN, or advanced features like cloud firewalls, Deep Packet Inspection (DPI), and DNS filtering, our tools offer complete protection and network segmentation.

Our security solutions allow you to start with VPNs and later add firewalls, DNS filtering, DPI, and even Download Protection as your security needs evolve. This full suite of features meets the definition of Next-Generation Firewalls, with the added flexibility to enable each feature separately or all together, based on your needs. NordLayer ensures that your security grows with your business, providing a long-term, adaptable solution.

With NordLayer, you can easily lock down critical assets, segment networks, and protect both on-premises and cloud resources. Secure remote access is simple to implement, reducing the risk of data breaches. Whether you need VPNs, firewalls, or a complete NGFW solution, NordLayer’s adaptable tools have you covered.

Next-generation cybersecurity is available for all. Find out more by contacting NordLayer today.

Frequently asked questions

Does a VPN solve firewall needs?

Firewalls and VPNs have different use cases and play complementary security roles. Firewalls filter incoming and outgoing traffic, allowing you to apply network segmentation and block dangerous traffic. VPNs, on the other hand, shield network traffic via an encrypted tunnel.

Firewalls cannot be used as a replacement for VPNs or vice versa. They are discrete tools with separate uses. Only deploy them if you have a solid use case for doing so.

What comes first, VPN or firewall?

Companies usually adopt VPNs first. VPNs are simple to operate and provide a reliable level of protection. Employees can get to grips with VPNs quickly, and everyone understands the role they play.

More mature organizations often use firewalls as they require more complex configuration and maintenance.

However, the answer isn’t always straightforward. VPNs and firewalls address different security needs, so the implementation strategy should reflect the specific requirements of your company. It’s important to assess your needs carefully and implement the right tools for your situation.

What is the difference between a VPN server and a VPN firewall?

A VPN server processes network traffic and assigns the client a new IP address for the session. VPN servers also establish encrypted tunnels between clients and servers to protect the user’s data and identity.

While a VPN firewall can be configured to allow only VPN traffic, this is not its only purpose. A VPN firewall functions similarly to a regular firewall but with added rules or configurations specific to VPN traffic.

A VPN firewall functions like a standard firewall but includes additional rules and configurations specific to VPN traffic. This allows admins to combine VPN and firewall protection seamlessly. While it can be configured to allow or block only authorized VPN traffic, its purpose extends beyond that. It provides the same filtering and security features as a regular firewall, with added capabilities for managing and securing VPN traffic.

Can a firewall block a VPN?

Yes. VPNs may use network ports that firewalls automatically block. For example, the PPTP protocol uses TCP port 1723, and the OpenVPN protocol uses UDP port 1194. Firewalls identify traffic passing through those ports as suspicious and may prevent network access. Port blocking makes it vital to configure firewalls before adding VPN protection.

Imagine this: Your new accounting employee receives a call from what seems to be your company’s financial service provider. The caller sounds professional and mentions a suspicious transaction in the company’s account. 

Reassuring your employee that it’s a routine check, they ask for a one-time password (OTP) that has just been sent to secure the account. In a rush to safeguard the business, your employee shares the OTP—unaware they’ve fallen victim to a sophisticated scam involving an OTP bot.

Such real-life scenarios show how serious the threat of OTP bots has become in our digitalized environment. Understanding what OTP bots are and how to protect yourself from them is crucial to safeguarding your personal and business information. Let’s take a closer look at this emerging threat and explore ways to defend against it.

What is an OTP bot?

An OTP bot is a malicious automated software that cybercriminals use to steal one-time passwords (OTPs). OTPs are temporary verification codes sent to a user’s phone or email as part of two-factor authentication (2FA) or multi-factor authentication (MFA) processes. These codes provide extra security for online accounts, ensuring that even if someone knows your password, they still need the OTP to gain unauthorized access.

OTP bots exploit the trust and urgency associated with these security codes, tricking users into revealing their OTPs. Once the bot obtains the OTP, it can bypass security measures and access personal data and accounts.

How do OTP bots work?

OTP bots operate through a combination of social engineering and automated technology. Here’s how they typically work:

1. The attacker initiates contact with the victim, often posing as a legitimate entity such as a bank, service provider, or even a tech support representative. The goal is to trick a user by creating a sense of urgency and trust, convincing them that sharing their OTP is necessary.

2. Once the victim is convinced, the attacker uses an OTP bot to trigger a legitimate OTP request from the service provider. The attacker then attempts to log into the victim’s account using their credentials (often obtained through a previous phishing attack or data breach).

3. The bot waits for the victim to receive the verification code and then relays the request to the victim, often through a phone call or text message. The bot uses convincing language and scenarios to persuade the victim to share their OTP.

4. Once the bot receives the OTP from the victim, it immediately uses it to complete the login process, gaining unauthorized access to the victim’s account.

By automating this process, attackers can efficiently target multiple victims simultaneously, increasing their chances of success.

Process of OTP bot attacks

Understanding the step-by-step process of OTP-related attacks can help you recognize and avoid them. Let’s consider another example. You receive a call from someone claiming to be from a popular online retailer. They inform you that there is an issue with your recent order and they need to verify your identity to proceed with the correction.

They ask you to provide the verification code sent to your phone to confirm the changes. In reality, the caller is an attacker using an OTP bot. They have already initiated a password reset request on your retailer account, triggering the OTP.

As soon as you share the OTP code, the attacker uses it to change your account password and gain access, potentially making unauthorized transactions with your stored payment information. Here’s how these attacks typically unfold in a particular order:

1. Reconnaissance: Malicious actors gather information about potential targets through phishing emails, social media, and other online sources. This information helps them craft convincing scenarios for the social engineering phase.

2. Initial contact: The attacker contacts the victim by phone, often using spoofed numbers or email addresses to appear legitimate. They create a sense of urgency or importance, prompting the victim to act quickly.

3. Requesting the OTP: Using stolen login credentials, the attacker tries to log into the victim’s account, triggering an OTP request from the service provider.

4. Interception: The attacker’s OTP bot waits for the victim to receive the OTP codes. The bot then contacts the victim, often through a phone call, claiming to need the OTP to resolve a supposed urgent issue.

5. Persuasion: The bot uses persuasive language and convincing scenarios to convince the victim to share the OTP. This might involve claims of fraud prevention, account recovery, or urgent security updates.

6. Exploitation: Once the OTP is obtained, the attacker uses it to complete the login process and gain unauthorized access to the victim’s account. This access can lead to unauthorized transactions, financial theft, data breaches, and other forms of cybercrime.

The impact of OTP bot attacks on organizations and networks

OTP bot attacks can have severe consequences for both individuals and organizations. Beyond what was mentioned earlier, here are some potential impacts:

• Financial loss: Unauthorized access to accounts can result in significant financial losses, particularly for businesses handling large sums of money

• Data breaches: Access to sensitive data can lead to data breaches, exposing personal and business data to misuse

• Reputational damage: Victims of OTP-related attacks, especially businesses, can suffer reputational damage, while customers and clients may lose trust in the organization’s ability to protect their digital information

• Operational disruption: Attacks can disrupt business operations, causing downtime and lost productivity

One notable example is the attack on Twitter in 2020, in which attackers used social engineering and OTP bots to gain access to high-profile accounts. They then used these accounts to promote a cryptocurrency scam, causing financial and reputational damage to the platform.

How to protect your business from OTP bots

Protecting your business from OTP threats involves a combination of technological solutions and best practices. Here are detailed strategies to safeguard your organization:

1. Implement multi-factor authentication (MFA)

Multi-factor authentication (MFA) is a critical safety measure that adds an extra layer of protection beyond passwords. Implement MFA to ensure that unauthorized access is prevented even if a password is compromised.

Consider MFA methods that don’t depend solely on text messages, such as app-based authenticators or hardware tokens, which are more secure alternatives. Additionally, integrate two-factor authentication (2FA) into your regular protocols, as it can significantly enhance your overall security posture.

2. Educate employees

Employee awareness is a key component in defending against all kinds of threats. Regularly train your employees about the risks of OTP bots and social engineering tactics. Ensure they recognize suspicious requests for OTPs or other sensitive information.

Develop clear security protocols for verifying the legitimacy of such requests, and encourage employees to report any unusual or suspicious activity immediately.

3. Monitor & analyze

Keep monitoring your systems for early detection of OTP threats. Use advanced analytics tools to track and analyze user behavior, looking for patterns indicating an ongoing or attempted attack.

Implement monitoring solutions that provide real-time insights and alerts about anomalous activities. By maintaining a vigilant watch over your network and systems, you can quickly identify and respond to potential breaches before they cause significant damage.

4. Secure communication channels

Ensuring the security of communication channels used for OTP delivery is crucial. Choose encrypted communication methods to send OTPs, such as app-based authenticators or secure email services.

By encrypting your OTPs and other sensitive communications, you can prevent attackers from intercepting and using them to gain access to your systems.

5. Regularly audit security

Regular security audits help identify and address vulnerabilities in your authentication processes and overall security infrastructure. During these audits, assess the effectiveness of your current security protocols, review access controls, and test your systems for potential weaknesses.

Regularly auditing your security practices ensures that your defenses remain robust and up-to-date.

Tools that can help mitigate OTP bot risks

To keep your organizational walls secure, some useful tools and technologies can help detect and prevent OTP bot attacks:

Behavioral analytics

Behavioral analytics tools can be instrumental in identifying and mitigating OTP threats. Tools designed to analyze user behavior and detect anomalies—that may indicate a security threat—provide real-time alerts and detailed reports, enabling organizations to respond swiftly to potential attacks and prevent unauthorized access.

Advanced authentication solutions

Implementing advanced authentication solutions can significantly enhance security against attacks. Tools like Google Authenticator offer more secure methods for generating and verifying one-time passwords.

Such solutions reduce reliance on text messages, which are more vulnerable to interception by OTP bots. Using app-based authenticators or hardware tokens adds an extra layer of security, making it harder for attackers to infiltrate.

Fraud detection systems

Fraud detection systems can help detect and prevent fraudulent activities, such as an OTP bot attack. These systems use advanced algorithms and machine learning to analyze transaction patterns and identify suspicious behavior.

By integrating these systems into your security protocols, you can proactively detect and mitigate potential threats before they result in unauthorized transactions or data breaches.

IP allowlisting

Even if an attacker has access to your credentials, including a one-time password (OTP), they still won’t be able to connect to sensitive databases or tools without the correct IP address. With IP allowlisting, only pre-approved IP addresses are granted access to your network, adding a critical layer of security.

NordLayer supports this by enabling organizations to create virtual private gateways with fixed IP addresses, ensuring that unauthorized users are blocked, even if they possess valid login credentials.

Device posture security

Device posture security helps prevent unauthorized devices from accessing sensitive resources. With features like NordLayer’s Device Posture Security (DPS), organizations can ensure that only approved devices—whether personal or company-issued—are granted access. Even if an attacker has all the correct login credentials, access will be restricted if they’re not using a recognized, authorized device. This adds another layer of protection, ensuring that only compliant devices can interact with your network.

Step-up authentication

Step-up authentication involves implementing additional verification steps when high-risk activities are detected. For example, suppose a user logs in from a new location or attempts a high-value transaction. In that case, the system can require additional authentication methods, such as biometric verification or a hardware token. This approach ensures that only legitimate users can perform sensitive actions, reducing the risk of unauthorized transactions.

These tools and technologies can help businesses significantly reduce the risk of OTP threats and protect their data. Staying vigilant and implementing these security measures is essential to maintaining a robust defense against evolving threats.

Best practices for enhancing security against OTP bots

To enhance your security posture against OTP bots, consider the following practices:

• Regular software updates. Update all software and systems regularly to fix security holes. Keeping everything up to date helps protect against known vulnerabilities.

• Implement strong password policies. Enforce complex and unique passwords for different accounts. Use password managers to help you manage and generate secure passwords and regularly prompt password changes.

• Train your employees. Conduct regular training sessions to inform employees about the latest phishing tactics, social engineering schemes, and specific threats, such as OTP bots. Establish protocols for verifying unusual requests for sensitive information.

• Encrypt communication channels. Encrypted messaging services or app-based authenticators, including OTPs, are used to transmit sensitive information. Avoid SMS-based OTPs for critical transactions due to their vulnerability to interception.

• Conduct regular security audits. Perform periodic security audits to identify vulnerabilities and weaknesses in your authentication processes. Work with third-party security experts to conduct comprehensive audits and provide improvement recommendations.

• Develop a robust incident response plan. Create a well-defined incident response plan for managing and mitigating the impact of security breaches. Include steps for responding to OTP bot attacks, such as isolating affected systems and notifying stakeholders.

• Implement access controls & the principle of least privilege. Ensure employees have access only to the resources necessary for their roles. Regularly review and adjust access permissions, and utilize role-based access control (RBAC) to manage user permissions.

• Use threat intelligence & monitoring services. Integrate threat intelligence services for real-time information about emerging threats. Continuous monitoring tools and security information and event management (SIEM) systems should be used to detect suspicious activities early.

• Stay informed about new threats. Stay updated on new threats, vulnerabilities, and best practices by participating in industry forums, attending conferences, and subscribing to security bulletins. Proactively adapt your security measures based on the latest developments.

Conclusion

While OTP bots pose a serious threat, staying vigilant and proactive puts you in the strongest position to prevent their constantly evolving tactics. OTP attacks will only grow more advanced if we fail to upgrade our defenses. Here are the core items to remember:

1. Conduct regular employee training to spotlight the latest social engineering techniques. Aware, informed staff are your first line of prevention.

2. Implement robust, at least two-factor authentication wherever possible. Removing reliance on single-factor OTPs starves bots of their favorite phishing fuel.

3. Consider additional verification for high-risk events like fund transfers. Extra authentication layers prevent bots’ most enticing break-in targets.

Cybersecurity is an ongoing process that needs effort and adaptation. While challenges will always exist, empowering your organization with strategic security practices makes you resilient against sophisticated online threats. Stay proactive and keep your digital defenses strong.