The firewall that once guarded your business like an impenetrable fortress has sprung a leak. Behind crumbling perimeter walls, cybercriminals continuously find ways to infiltrate vulnerable web applications to access precious data assets. Legacy defenses struggle to stem the tide, as sophisticated threats exploit an ever-widening attack surface. It’s time to modify your firewall strategy to strengthen your dynamic network environment.
While firewalls have been a core component of enterprise network security for decades now, the web applications that firewalls aim to protect have grown increasingly complex over time. Modern web apps utilize diverse protocols, encryption standards, and connection routes that traditional firewalls struggle to analyze. That means it’s time to shift to more advanced, application-aware firewall models.
In this post, we explored how firewall technology adapts to support better HTTP/HTTPS traffic, microservice architectures, and multicloud environments. We also examined how leading next-generation firewall (NGFW) solutions aim to future-proof enterprises against web-based threats.
The Limits of Legacy Firewalls
Traditional port-based firewalls operate by restricting connections to whitelisted ports and blocking all others. For example, a basic firewall may allow inbound web traffic on ports 80 and 443 for HTTP/HTTPS while blocking everything else.
This approach was effective when application architectures were simple. But modern apps don’t always stick to these standard ports. Developers now roll out many different components across dynamic containers and IP addresses, making it nearly impossible to maintain static allow lists. In other words, basic firewalls have nearly become obsolete in the modern workplace.
At the same time, TLS/SSL encryption hides application layer data from legacy firewalls. Traditional firewalls can’t tell malicious from benign traffic without decrypting and re-encrypting packets, which introduces latency and management overhead. To make matters worse, here are some of the other limitations of legacy firewalls that are becoming more vulnerable.
- Lack of application visibility: Traditional firewalls cannot decode HTTP, XML, JSON, and other file formats to analyze app-layer attacks hidden in seemingly safe protocols. As such, they are vulnerable to threats like SQL injections, remote file inclusions, and local and file disclosures.
- Inability to handle evolving protocols: Most firewall appliance vendors take years to add support for newer protocols, which means they often lag behind what modern web and mobile apps require.
- No user identity context: Legacy firewalls cannot tie traffic to user identities and apply granular policies based on roles, locations, behaviors, and risk levels of individual employees or customers.
- Performance bottlenecks: Legacy firewalls require additional devices, such as SSL intercepting proxies, to decrypt secure traffic for inspection. This approach introduces latency, which affects user experience and increases costs.
We are not saying traditional firewalls no longer have a place because they still do. However, given the rapid rise of cyber threats and the sophistication of attacks, businesses and enterprises with valuable data (i.e., prime targets for hackers) should consider looking for more advanced protection.
NGFWs Bridge the Gap
Speaking of advanced protection, NGFWs make up a new category of network firewalls that provide greater awareness of applications, users, and evolving threats compared with legacy firewalls. Think of them like the upgraded security guards of the network world.
Unlike traditional firewalls that simply check for basic threats, NGFWs analyze the full context of network traffic flows to provide granular visibility, control, and protection based on the specific applications, user identities, content within encrypted traffic, and intelligent threat detection.
Their capabilities include:
- Application awareness: NGFWs can decode traffic from thousands of web and mobile apps to understand application-layer attacks that exploit vulnerabilities in specific software frameworks and libraries.
- User identity integration: These newer firewalls can tie traffic to user identities with directories like Active Directory. This feature enables granular access policies based on factors like user roles, behaviors, and risk levels.
- Robust security stack: NGFWs incorporate modern systems like intrusion prevention, antimalware scanning, and sandboxing.
- Decryption of HTTPS traffic: NGFWs can decrypt encrypted traffic for inspection without compromising security or performance, providing visibility into threats that leverage HTTPS.
- Threat intelligence feeds: NGFWs ingest real-time intelligence on the latest vulnerabilities, exploits, and attacker infrastructures, enabling them to automatically block new threats.
By understanding apps and users in such granular detail, NGFWs unlock advanced traffic steering and precision access controls that are impossible with legacy port-based firewalls.
Microsegmentation and the Rise of ZTNA
Modern apps are now built using microservice architectures, breaking down app features into small, independent pieces that are easier to update. Microservices are packaged differently than traditional apps, making them particularly flexible and scalable, and bringing plenty of benefits to both developers and businesses. However, these modern setups also create some security issues, such as:
- They have complicated east-west internal traffic flows or the transfer of data to different servers that occur within a data center, which could take time to secure.
- They often use a mix of cloud and on-site servers, making security rules complex.
Microsegmentation has emerged as a way to handle these issues. It separates an app into isolated segments with firewalls between them, restricting hacker movement if one area is breached.
Zero-trust network access (ZTNA) takes microsegmentation further. It blocks access by default, even for users and devices inside the network. To grant access to specific app pieces, ZTNA first needs to check identities, verify security settings, grant limited access rights, and inspect traffic.
Many NGFWs now integrate ZTNA with other security tools, allowing organizations to closely monitor and maintain tight control over each app component and user. Therefore, in modern environments, firewalls shift from broad rules to specialized identity-based ones. This ability minimizes damage from breach and allows you to enjoy more streamlined app architectures.
Final Thoughts
The world of cyber threats is constantly evolving, and firewalls must keep pace, or company networks will soon become sitting ducks. One-dimensional application port blocking that firewalls use can no longer handle modern web applications that rely on complex protocols, encryptions, and diverse connection methods.
Thankfully, NGFWs have deep understanding of applications, user identities, and real-time threat information, providing a serious leap forward in network security.
