What exactly is meant by the term "Web Application Firewall"?

What exactly is meant by the term "Web Application Firewall"?

One type of firewall is known as a web application firewall. This type of firewall analyzes, processes, and stops data packets as they travel to and from a website or online service. A web application firewall can be either network-based, host-based, or cloud-based; it is frequently implemented through a reverse proxy, and it is positioned in front of one or more websites or apps. Other possible implementations include cloud-based, host-based, or cloud-based. The Software web application firewall could indeed operate as an internet backbone appliance, a server plugin, or as a cloud service. web application firewall performs an inspection on each packer, applies a rule base to conduct an analysis of layer seven web application logic, and filters out possibly hazardous traffic. Web loopholes could be enabled as a result.

Web application firewalls are a typical type of security control that businesses implement to safeguard their web systems from zero-day exploits, malware infestations, impersonation, plus various other unknown and known flaws and threats.

A web application firewall is capable of identifying and immediately preventing several of the most threatening web application firewall security vulnerabilities through the use of customized inspections. web application firewall something that traditional network firewalls and other intrusion prevention systems and infringement protection technologies may not be able to do.

Web application firewalls are enormously beneficial to businesses that provide products or services over the internet, such as e-commerce shopping, online banking, and other interactions between clients or business partner organizations. Web application firewalls can also be used to prevent unauthorized access to a company's network.

How does web application firewall work?

The hypertext transfer protocol (HTTP) queries sent to a web application firewall are analyzed, and then a set of rules are applied to determine which aspects of the dialogue are safe and which aspects could potentially cause harm. Get and post requests are the primary components of HTTP dialogues that are analyzed by the web application firewall. The get request is used to obtain information from the server, whereas the post demand is used to give data to a server in order to update its site.

When evaluating and filtering the content that is included in these HTTP requests, a web app firewall has the ability to choose either of the following two techniques or a mixed version of the two.

1. Whitelisting in web application firewall: When using a whitelisting strategy, the web application firewall will, by default, refuse any and all requests and will only grant access to requests that are known to be trustworthy. It gives a rundown of what IP addresses are recognized to be secure in the network. When compared to blacklisting in web application firewall, whitelisting in web application firewall uses fewer of a company's resources. The disadvantage of using a Whitelisting strategy is that it has the potential to block communication that is not malicious. In spite of the fact that it has the potential to be both effective and fast, the results may be less than exact in web application firewall.

2. Blacklisting in web application firewall: A blacklisting strategy in web application firewall is a way of allowing packets to pass through while blocking harmful online traffic and protecting websites or web apps from having weaknesses. This approach utilizes predefined fingerprints. It is a set of criteria that can recognize potentially harmful packets. Because public websites and web applications receive a significant amount of traffic from unknown IP addresses that aren't proven to be either malicious or benign, blacklisting in web application firewall is more suited for these types of web pages and services. Instead of reverting to trusted IPs, using a blacklisting strategy in web application firewall uses more resources since it takes more information to filter signals based on specific criteria. This is in contrast to the whitelisting approach, which uses trusted IPs.

3. Hybrid security in web application firewall: A hybrid security model combines aspects of blacklisting and whitelisting in web application firewall into one cohesive whole. Essentially, a web application firewall job is to evaluate HTTP exchanges and decrease or, in the best-case scenario, delete harmful traffic before it reaches a server to be processed. This is true despite the security framework that the web application firewall employs.

Different kinds of firewalls for online applications:

Web application firewalls that are based on networks:- Are typically built on equipment and have the ability to reduce latency due to the fact that they are deployed locally on facilities through the use of a dedicated appliance. This places them as near to the application as is physically possible. Large-scale installation, setup, and administration are facilitated by the majority of major network-based web application firewall vendors' support for the replication of rules and settings over numerous devices. The cost of this sort of web application firewall product is the most significant disadvantage, there is an initial investment expense, as well as recurring operational costs for the upkeep purpose.

Web application firewalls that are host-based can be completely incorporated into the application's source code itself. A host-based deployment of web application firewall offers a number of benefits, including expanded choices for customization and cheaper overall costs. In order to function properly, host-based web application firewall need app frameworks, and they are reliant on the resources that are available on the local server. This might make them difficult to administer. Because of this, it is possible that more staff skills, such as those of developers, and system analysts, will be necessary.

Hosted in the cloud Web application firewall: Could be integrated into the user's source code in its entirety. The placement of web application firewall on a host, rather than on a separate server, offers a number of benefits, notably increased options for customization and lower expenses overall. App frameworks are required for host-based web application firewall, and these types of web application firewall are also dependent on the assets that are present on the local server in order to perform their functions correctly. Because of this, it could be hard to administrate them. As a consequence of this, it is probable that an increased number of staff capabilities, such as those of system developers and analyzers, would be required.

Benefits of web application firewall.

Benefit of a web application firewall is that it may protect web-based applications without actually requiring knowledge of the original program itself. This is a significant advantage. The program can be protected by a cloud-hosted web application firewall even though it does not have access to the application's code, in contrast to a host-based web application firewall, which can be included in the application code. Furthermore, a cloud web application firewall is simple to deploy and operate, and it offers users quick virtual patching options that allow them to rapidly customize their configurations so that they can respond to newly discovered risks.


Since it helps prevent information leakage, a custom application firewall (WAF) is an essential element for the expanding number of businesses that offer their goods and services over the internet. This includes online banking services, social media platform suppliers, and smartphone app designers. Back-end databases, which are accessible through web apps, store a significant amount of sensitive data, including credit card information and customer records, amongst other types of data. These programs are commonly targeted by attackers in order to obtain access to the data linked with them.

In the case of banks, for example, a web application firewall could assist them in fulfilling the requirements of the Payment Card Industry Data Security Standard, which is a collection of standards designed to safeguard cardholder information. a web application firewall is an essential component of the security architecture of a contemporary company.

Although a web application firewall is vital to network security, it is only useful when used in conjunction with other security measures, such as traditional or next-generation firewalls, intrusion prevention systems, and intrusion detection systems.

Professional Web application firewalls are contrasted with open-source Web application firewalls.

There are open-source and commercial web application firewall alternatives available to choose from. Popular commercial vendors include Cloudflare.

The Web application firewall versus the firewall

The word "firewall" refers to a more general category of protective software for computer networks that filter entering data packets. Inside this overarching description, there are a few subcategories that are separated from one another based on the type of security they offer and the manner in which they offer it. Packet filtering, stateful inspection, proxies, and next-generation firewall are some of the classifications that fall under this category.


A web application firewall is another category of firewall, differentiated by how specifically it filters data packets. The web application firewall is unique because it focuses on solely web-based attackers at the application layer, whereas other types such as packet filtering and stateful inspection may not be able to defend against these attacks.


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