Choosing a Javascript Vulnerability Scanner

JavaScripts are very complex for an automated scanner to understand. That is why Netsparker has a dedicated JavaScript engine that executes them and emulates a real user, so it can analyze, understand and find security issues in them.

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JavaScript has emerged as one of the modern World Wide Web's foundational technologies. It has enabled businesses to engage their markets with increasingly rich web applications.

The most recent OWASP Top 10 report, released in 2017, pays special attention to JavaScript. It notes that between node.js on the server side as well as web apps built on Angular and React that run traditionally server-side functions on the client side, "the fundamental technology and architecture of applications has changed significantly." (OWASP Top 10 - 2017, page 4)

But, with increased functionality come security risks.

Vulnerabilities Put Users at Risk

Cross-Site Scripting (XSS) describes, at its heart, an application vulnerability that allows users to run arbitrary scripts due to poor user input sanitation. In addition to classic stored and reflected forms of XSS, the rise of JavaScript has also been accompanied with a rise in Document Object Model based XSS, also known as DOM XSS.

The traditional types of XSS require some interaction with the server, but DOM-based XSS typically happens inside a web browser like Google Chrome or Mozilla Firefox. In a DOM-based XSS attack, the attacker takes advantage of a vulnerable JavaScript framework or single-page application that will dynamically include and run user-supplied code. They convince a target to click a link that has malicious code in a parameter. The vulnerable application will run in the user's web browser, complete with the attacker's added JavaScript code. This allows the attacker to steal their target's sessions and credentials, log keypresses, or install malware.

Using components with known vulnerabilities is another common point of failure. Tools like the open-source retire.js mean that vulnerable JavaScript libraries cannot stay hidden for long. An attacker can clone retire.js from Github, open up a command line or a Firefox extension, and scan for web applications that are using outdated libraries. This requires businesses that develop and implement web applications to monitor and update the underlying libraries.

Insecure web applications can erode trust by putting credentials and data at risk. Whether you develop from scratch or start with an open-source content management system or other third-party platform, you need a vulnerability scanner that can quickly and accurately identify JavaScript vulnerabilities.

Identify Real Security Vulnerabilities in JavaScript More Quickly

The first step in managing the security of JavaScript-based applications is getting a scanner that can quickly and easily identify JavaScript vulnerabilities. Netsparker's Web Application Security Scanner can bring you that solid foundation.

The Netsparker dashboard makes it easy to scope and schedule scans. And, thanks to our Proof-Based Scanning™ technology, the results are easy to understand and act upon. The scanning reports show proof of exploit: what string in the HTTP request caused the exploit, and what was compromised as a result. That way, your security team will not have to waste time performing tedious manual validation because the scanner proves the reported security vulnerabilities are not false positives. Security analysts can move on to more valuable tasks, and developers can begin to develop, test, and deploy security fixes.

Get Netsparker Today

See for yourself how we can help you build the foundation for better JavaScript security. Contact us today to begin your 15-day free trial of Netsparker Web Application Security Scanner.

What our customers are saying

"I had the opportunity to compare external expertise reports with Netsparker ones. Netsparker was better, finding more breaches. It’s a very good product for me."
"As opposed to other web application scanners, Netsparker is very easy to use. An out of the box installation can detect more vulnerabilities than any other scanner."
"We chose Netsparker because it is more tailored to web application security and has features that allow the university to augment its web application security needs."