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What is Web Application Firewall ? How Does it Protect Your Web Application – Packet Guide

Well, we all know that businesses grow from traditionally-licensed enterprise software over software-as-a-service applications treated in the cloud. Hence the security of the application courses has now become more significant. Therefore, the course for protecting the application is often exceeding the scope of the traditional interference detection and restraint systems. 

Basically, a web application firewall simply assists to protect HTTP-based applications from outside attacks by watching and filtering connections that resemble irregularly. As the most popular charges against web applications are cross-site scripting assaults. In this circumstance, a shortage of proper escaping and input validation enables an attacker to insert JavaScript code that is placed and run by clients that demand the page.

XSS scripting charges are often applied to steal authentication cookies, providing attackers way to, and possibly control over a site. Moreover, a Web application firewalls are designed to block attacks of this species.

A WAF monitors all incoming attachments between HTTP clients and an application. Hence, they filter connections as per the given set of rules, including those fitted to block most SQL injection and cross-site scripting attacks. 

Therefore, WAF protection is expressly crucial for web applications that present a way to delicate medical or financial data. A Web Application Firewall is proficient in filtering this type of assault by avoiding trials to inject JavaScript or separating suspicious connections before they cracked the application.

So, the Attackers are always watching for ways around the security that WAFs offer; that’s why it’s essential to keep the firewall’s rules up-to-date.


What is a Web Application Firewall?

A Web Application Firewall (WAF) is a web application-specific security clarification intended to preserve internet applications that utilize HTTP to transmit and receive knowledge between clients and a web-server. Web Application Firewalls recognize and filter conceivably wicked traffic by practicing a set of rules and machine-learning algorithms. Thus it checks every HTTP application and makes sure that solely “good” traffic is transferred to the portal server, while “bad” traffic is obstructed or discarded. 

Hence, Web Application Firewalls preserve upon such threats as Denial of Service (DoS) attacks, SQL injections, and Cross-site scripting. As we all know that, Website assaults and cyber crimes, in general, are increasing in amounts every day, and the consequence of security in our everyday lives is overgrowing. 

So, remaining secure in the online world grows more and more powerful every day, and it is necessary to guard your website and the data it operates now. Therefore, we’ll explain what a web application firewall is and why it is essential. There is another excellent reason to hold a website application firewall as it saves your lot of time. 

After establishing a WAF, you no longer require to spend time pondering about measures to defend it. As if your website does get chopped, then you have to waste your several hours just for finding a proper solution to fix your issue. Therefore, possessing a powerful Web Application Firewall (WAF) grants companies and website owners peace of determination.


Web Application Firewalls vs. Firewalls

As per the information, the traditional firewalls restrict way to ports. Hence, the ports can be hindered wholly or enable specific sorts of traffic to cross through. So, the firewall does not consider the content of the traffic. Whereas, the web application firewalls concentrate on the content only. Thus, by placing up a website with https, you get traffic to the website protected, but encrypted, protected traffic can still be ill-disposed. 

Therefore, the Web application firewalls monitor the content of the traffic in series to identify potentially serious requests. Well, it depends on how you search your web application firewall, a possibly critical application can be obstructed completely, trigger an alarm, or completely be logged.

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How WAF (Web Application Firewall) work?

Now, after knowing all about the web application firewall. Now the question arises that how the web application firewall works? If you’re questioning how a WAF works, let’s see it from a high level. Before companies abandon your website, they go through the WAF to conclude if they’re reliable traffic and get obstructed if they are not reliable traffic. 

Application Profiling

The construction and functionality of web applications differ considerably, so it can be hard to understand what’s working the way it should and what describes a threat. With application profiling, the WAF receives the application’s difficulties to recognize signs of a threat.

Blacklist Signatures

Online articles are identifiable by their digital subscriptions. When an article is classified as ill-disposed, like a disease, its signature is attached to the WAF blacklist. That implies the virus gets detected and blocked before it can enter your website.

Correlation Engine

A correlation engine receives an application’s normal behavior and then relates that to the performance it displays in real-time.

DDoS Protection

In DDoS attacks, a hacker obtains control of various web applications to build a network called a botnet. The botnet then fluffs down a target by attaching up all its resources via multiple applications. However, if you have WAF then it will simply recognize the botnets and obstructs their requests so your site can function normally.

Content Delivery Network (CDN)

A WAF will promote up your website through a content distribution network. With your site cached on the CDN, content is delivered via the point of presence (PoP) nearest a visitor. So, the WAF promotes upload times, on medium, by 70%.

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Types of Web Application Firewalls

Generally, there are three main web application firewalls. They are network firewalls, local firewalls, and application firewalls. Now let’s review each of them one by one.

Network Firewalls

Network Firewalls are what we’re most accustomed to. Well, you can locate them in home routers, preserving our trusted zone (home network) from an untrusted area (the internet).

In large organizations, you’ll see comparable configurations, but with extra firewalls that separate various parts of a network, defending their network assets (trusted zones).

Well, these firewalls are intended to look at network connection efforts to different network ports, as well as examine incoming packets and their connected metadata.

Thus, based on rules, the firewall then concludes what is and isn’t permitted into the environment they are guarding.

If the network firewall remains in front of a mail server, it enables port 25, which supports SMTP. The list continues, based on the particular applications your environments have to receive.

Local Firewalls

These firewalls are also designed to shield from untrusted environments, but function at a separate level. They are concentrated on a particular situation, such as a server or your desktop.

You will find local firewalls on all of your devices. Each device may have its arrangement and entrance requirements, and your local environment enhances its advanced environment.

When running with your website host, your way to the local firewall may be limited depending on the type of arrangement you have (i.e., Shared, VPS, Dedicated or Managed Host). Most of the hosts, despite your configuration, should be leveraging both network and local firewalls over their entire network.

Hence, their network firewalls guard the perimeter, and the local firewalls defend the specific assets within the boundary. Comparable to the network firewall; however, the local firewalls have limited to do with the protection of your website.

Application Firewalls

These firewalls are similarly designed as local and network firewalls, which are interconnected technologies to existing security deployments.

Application firewalls move over the metadata of the packets being transported at the network level and concentrate on the original data in transfer.

They are created to understand the sort of data allotted within particular protocols, think SMTP or HTTP. There are personal firewalls for various applications, like email or website firewalls.

While the application firewalls can be deployed so that you can find them at the local or network level. Hence, it depends on how the company has them configured.

However, apart from this, the question that website proprietors should be asking their hosts is how do they manage specific warnings to their website.

Why do You Require a Web Application Firewall and Its Importance?

Well, Hackers are always innovating and discovering new methods to get entrance to your site. Thus, it implies that holding an excellent security-minded coding method and executing security standards now in the coding process might not be enough. Always remember that a web application firewall is an extremely functional security tool mainly created to preserve web applications, so if this is the only security-related investment your organization has, then in today’s world, it’s regrettably still not sufficient. Thus by extending a WAF in front of a web application, a protective shield is placed between the web application and the Internet. Whereas a proxy server shields a client machine’s connections by using a mediator, a WAF is a reverse-proxy, defending the server from disclosure by having clients pass through the WAF before entering the server.

Moreover, a WAF works through a set of rules, usually called policies. These policies intend to guard against bugs in the application by filtering out ill-disposed traffic. Thus the value of a WAF appears in part from the rate and efficiency with which policy adjustment can be achieved, enabling faster answers to different attack vectors; while a DDoS attack, rate limiting can be immediately implemented by changing WAF policies. Thus, it’s essential to have a good web application firewall.

Key Benefits of a WAF (Web Application Firewall)

Guards and accelerate the working of your web applications

Well, the well-known security company the Driz Group combined with IMPERVA, Incapsula, and other foremost WAF and DDoS mitigation companies to defend and stimulate websites and web applications for our clients, utilizing best in breed technology. Thus your application code and settings are never absolute. Therefore always remember that the first door to your data is well guarded against dispersed denial of service attacks, spammers, hackers, and bad bots. Consequently, it also protects your organization in the performance and your application that is running the ill-disposed code.

Moreover, Incapsula cloud, global CDN routes all traffic to your website and web applications, effectively profiling this traffic in real-time to obstruct all types of application cover threats as well as decreasing DDoS attacks. In the meantime, outgoing traffic is expedited and optimized with excellent caching and optimization methods, fulfilling welcome visitors rushing through while obstructing bad bots.

Enterprise-Grade Website Security

The PCI-certified Web Application Firewall and venerable bot protection abilities simply defend your website upon known and rising application-level warnings. Thus, it automatically adds PCI 6.6 compliance to your organization’s armory of agreement.

High-Capacity CDN & Optimizer

Establish on a globally dispersed network of data centers; the application-aware CDN passes Full Site Acceleration via intelligent caching and satisfied optimization devices. For instance, Canadian private and public organizations with rigorous agreement terms that record having the data on Canadian soil will take benefit of Toronto-based datacenter, to satisfy those conditions.

“Always On” DDoS Attack Protection

If you purchase the CDN and a devoted 24/7 NOC, then this simply secures the websites against the network, application, and DNS unmarked DDoS attacks – with zero company interruption. 


With the help of this article, we have given you a brief description of what WAF is, and how it works, what are the key benefits and much more. Thus we make no defenses for taking up site protection once again, as it is a really essential element for any website. Hence, if you’re running some professional site, security is even more necessary. 

Following all, an error concerning user data can steer you in firmly hot water. Thus, during this article, we’ve looked at a front-line preventive method that is, regrettably, low preference for many website proprietors.

A Web application firewall is a powerful tool that can be observed in plugins such as Wordfence, but if you are searching for a fully protected site, then it’s not your choice. A server-side resolution from the counterparts of Sucuri or Cloudflare is a more reliable solution and can have you preserved in times with little setup needed. 

So, what do you think about this? Simply share all your views and thoughts in the comment section below. And if you liked this article, then simply do not forget to share this article with your friends, family, and on your social media profiles as well.

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