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10 JavaScript Security Best Practices for Business Websites

The increase in website attacks makes JavaScript security a priority for any business. Here are 10 JavaScript security best practices for businesses to protect against e-skimming or other types of client-side attacks and ensure better client-side security of web applications.

Customers of the Segway Online Store have recently found themselves decidedly off balance as they move forward with their anticipated purchase of a Segway. Using an e-skimming technique, Magecart attackers stole customers’ credit card information by adding a malicious favicon to JavaScript on Segway’s website. As the researchers who uncovered the attack pointed out, while the malicious favicon script contained an image and was correctly displayed in the browser, the script also included a credit card skimmer. (Learn more about What is a Magecart attack.)

Find out what you can do to improve your JavaScript security best practices for your business.

Websites are not secure

Very little in the world today doesn’t involve a website. They are essential to business productivity and e-commerce. Traditional security tools like web application firewalls (WAFs), policy controls, and threat intelligence simply don’t protect the client side of a website. Why? Because of vulnerabilities in website code, increased use of third-party and fourth-party scripting, and use of JavaScript, all websites are ripe for attack.

Is JavaScript secure?

JavaScript was not designed with security in mind. And because there are no built-in security permissions in the JS framework, it is difficult to protect JavaScript code against client-side attacks. The most common JavaScript security vulnerabilities include:

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

By taking advantage of these vulnerabilities, hackers can leverage JavaScript to engage in malicious activity. Two of the most prominent attack types are cross-site scripting (XSS), which involves the injection of client-side code that allows threat actors to steal customer-entered data, 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.

Over 99% of all websites use JavaScript. It is believed that 80% of all websites use a JS library or third-party web framework for their client-side scripting. It is therefore essential to apply JavaScript security best practices.

How do I protect my JavaScript code?

Improving JavaScript security on a website or web application is quite easy. Here are the top 10 JavaScript security best practices for businesses:

  1. Use secure software development practices: Apply best practices that enable the development of more secure application code and make it easier to detect and eliminate errors early in the application development process.
  2. Use automated monitoring and inspection: Monitoring and inspection activities are essential, but also time-consuming if you don’t have an automated solution to regularly review JavaScript code. A purpose-built solution that automates the process can be a quick and easy way to identify unauthorized scripting activity.
  3. Audit your web resources: Know what web assets you own and the type of data they contain, and perform deep scans regularly to reveal intrusions, behavior anomalies, and unknown threats.
  4. Be selective with third-party and fourth-party scripts, plugins, and tools: 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 intentional malicious content. Always inspect third-party and fourth-party additions for vulnerabilities.
  5. Avoid embedded JavaScript and use a content security policy: Prevent cross-site scripting (XSS) attacks by avoiding the use of inline JavaScript and establishing a Content Security Policy (CSP).
  6. Perform JavaScript integrity checks: Include integrity code on websites to verify manipulation in any imported or retrieved JavaScript code.
  7. Validate entry: Where possible, add validations for input to prevent malicious JavaScript injection.
  8. Maintain secure JavaScript libraries: Confirm the security of all external libraries by ensuring that they are not blacklisted. Patch and update your libraries regularly and avoid reliance on third-party library sources.
  9. Avoid eval(): Avoid using this command when writing code, as it can enable a cross-site scripting or injection attack.
  10. Keep strict mode enabled: Strict mode can optimize code and minimize potential vulnerabilities by highlighting and removing errors.

Improve your website security

JavaScript has risks. The only way to prevent your business and your customers from falling victim to a client-side attack is to apply JavaScript security best practices to your website and web application development process. To learn more about JavaScript security, check out our new e-book The Ultimate Guide to JavaScript Security.

The post 10 JavaScript Security Best Practices for Business Websites appeared first on Feroot.

*** This is a Feroot Security Bloggers Network syndicated blog written by the Feroot Security Team. Read the original post at: https://www.feroot.com/blog/10-javascript-security-best-practices-for-business/