How to check if your JavaScript security is working


Few programming languages ​​generate the same love-hate relationship as JavaScript. For many websites, JavaScript (JS) is an essential coding component that drives client-side programming. Yet JS is also extremely vulnerable to attacks, as it is easy for hackers to enter query strings into website code to access, steal, or contaminate data. Knowing if your JavaScript is secure is crucial to maintaining a safe user experience for your customers and customers.

What is JavaScript?

JavaScript is a text-based programming language used in website development. Using JavaScript, businesses can create interactive and user-friendly web pages. The history of JavaScript dates back to the early days of the Internet, when web browsers were just under development. Founded in 1995 by Netscape Communications (the same company that made the Netscape Navigator, remember?), JS was developed to create websites with a more dynamic user experience. It also supported other types of activities, like validating input, which were historically limited to server-side languages.

But is JavaScript safe? – A common but controversial programming language

Some estimates suggest that today over 95% of all websites use JavaScript specifically for behavioral elements of client-side web pages. It is believed that 80% of all websites use a JS library or third-party web framework for their client-side scripts. Since there are no security permissions built into the JS framework, it is difficult to protect JavaScript code from malicious actors targeting clients through the client side. The most common JavaScript security vulnerabilities include:

  • Source code vulnerabilities
  • Validation of entries
  • Use of client-side validation
  • Unintentional script execution
  • Exposing session data
  • Unintentional user activity

By taking advantage of the above flaws and vulnerabilities, hackers can attack JavaScript to engage in malicious activity. Two of the most common types of attacks include cross-site scripting (XSS), which involves client-side code injection that allows malicious actors to steal data entered by the client, and cross-site request forgery (CSRF or XSRF), which forces users to perform malicious or unwanted actions on a web application. Other threats include JavaScript sniffers and JavaScript injection attacks.

How to protect JavaScript?

The best way to improve JavaScript security is to use analysis tools that detect, identify, and alert to behavioral anomalies, as well as automated JavaScript-specific security policies that can automatically apply security configurations. and permissions to help continuously monitor and protect malicious clients. Additional activities.

Organizations can do other things to improve their overall JavaScript security:

  • Use secure software development practices: Apply best practices that enable the development of more secure application code and help find and eliminate errors early in the application development process.
  • Move the security to the “left”: Security cannot occur only after creating or installing a web application on a system. It should be part of the whole website and app development process from start to finish.
  • Audit your web assets: Know what web assets you own and the type of data they contain, and regularly perform in-depth scans to reveal intrusions, behavioral anomalies, and unknown threats.
  • Maintain safe JavaScript libraries: Confirm the security of all external libraries by making sure they are not blacklisted. Patch and update your libraries regularly and avoid reliance on third-party library sources.
  • Be selective with third-party scripts: Third-party JavaScript is a great way to avoid the time and money associated with developing your own code, but third-party scripts can also contain vulnerabilities or intentionally malicious content.
  • Use automated monitoring and inspection: Monitoring and inspection activities are essential, but also take time if you don’t have an automated solution to regularly review JavaScript code. A specially designed solution that automates the process can be a quick and easy way to identify unauthorized scripting activity.
  • Validate the entry: XSS risk can be minimized by validating input before calling JavaScript functions.

Next steps

JavaScript poses risks to organizations by increasing the number of vulnerabilities that exist on the client side. Protect your customers and websites using the right types of JavaScript security. If you want to make sure your JavaScript is safe, check out our Inspector and PageGuard products. They are specially designed to continuously monitor, inspect and analyze websites that are running JavaScript to protect them from attacks. And if you would like to see our products in action, please request a demo here: link.

The article How to check if your JavaScript security is working appeared first on Feroot.

*** This is a syndicated Security Bloggers Network blog from Feroot written by [email protected]. Read the original post at:


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