Javascript to protect web app

In , malicious client-side scripts are still posing a problem for large organizations. This year, British Airways revealed that they suffered a data breach in which , records were exfiltrated. Now, NewEgg has been hit with a similar data breach. This follows a string of attacks from a group known as Magecart , who were also responsible for publicized data breaches of Ticketmaster and Feedlify. Any time malicious Javascript is loaded onto a critical page— for instance, a payments page— it has the potential to wreak havoc.

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• GET CODING!
• JavaScript Security and Risks
• What is EME?
• How to Secure Your React.js Application
• WebView security issues in Android applications
• Why Web Application Visibility Is Important to JavaScript Security
• Most common JavaScript vulnerabilities and how to fix them
• Single-Page Apps
• How JavaScript obfuscation enhances app security

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The most common JavaScript vulnerabilities include Cross-Site Scripting XSS , malicious code, Man-in-the-middle attack and exploiting vulnerabilities in the source code of web applications. These can be prevented by scanning your code for vulnerabilities during development and educating your developers about security. Like nearly any programming language, JavaScript is not without its share of potential security exposures. Exploiting JavaScript vulnerabilities can manipulate data, redirect sessions, modify and steal data, and much more.

Although JavaScript is typically thought of as a client-side application, JavaScript security issues can create problems on server-side environments as well. The best defense against common JavaScript security vulnerabilities is to be aware of them and implement the proper controls to reduce exposure.

JavaScript security is related to investigating, preventing, protecting, and resolving security issues in applications where JavaScript is used. JavaScript itself is a fundamental technology for building web applications and is also very popular for building server-side, desktop, and even mobile applications. Because JavaScript is used mostly in the front-end, it makes sense to focus first on JavaScript security issues in browsers. Software vendors have also recognized these JavaScript security issues, reacting with JavaScript security scanning software and a variety of JavaScript security testing tools that make applications more secure and greatly reduce JavaScript security risks.

Find and fix vulnerabilities in your application code in real-time during the development process. Of course, this list is by no means exhaustive; rather, it is more focused on the front-end aspect of web applications. Frequently, source code vulnerabilities may be combined with other—even a number of—JavaScript security holes. Unfortunately in such cases, using a single JavaScript obfuscation cannot prevent or hide these types of vulnerabilities.

Because JavaScript is an interpreted, not a compiled, language, it would be virtually impossible to protect application code from being examined by potential hackers with this method.

Nonetheless, obfuscation is still a good practice, as it slows down the hackers in their reverse-engineering attempts. Another cause of security holes in the source code is the widespread use of public packages and libraries.

NPM , a lead player in the JavaScript ecosystem, offers more than a million packages in its registry. While the sheer variety offered is certainly an advantage, this also means there are potentially a huge number of hidden vulnerabilities in these packages that are installed in web application projects. Moreover, developers often install packages even for the simplest tasks, thus expanding their project dependencies.

This of course can lead to security issues and have other far-reaching consequences. While monitoring and addressing all potential application dependency vulnerabilities can be time-consuming and labor-intensive, auditing tools can help to automate and thus accelerate the process.

A multi-pronged approach for preventing JavaScript security issues in source code should include:. The majority of unintended script execution attacks involve cross-site scripting XSS. A particular concern related to JavaScript is the way it interacts with the Document Object Model DOM on a web page, allowing scripts to be embedded and executed on client computers across the web.

If HTML or JavaScript are not properly encoded when they are part of of a message, this could enable unscrupulous users to post the following content in the forum:. Posting such a script would make every end user a victim unintentionally facilitating the attack by simply running the application, with the malicious code appearing to be part of the web page. While the above code is harmless, a real-life hacker could of course post far more dangerous code.

To prevent XSS attacks, developers should apply sanitization—a combination of escaping, filtering, and validating string data—when handling user input and output from the server. When the browser is rendering the web page and encounters these characters, it sees them as part of the code of the web page rather than a value to be displayed. This is what allows the attacker to break out of a text field and supply additional browser-side code that gets executed.

To prevent this, any time browser-supplied data will be returned in a response whether immediately reflected or retrieved from a database , these special characters should be replaced with escape codes for those characters. In some cases, it might be preferable to simply remove dangerous characters from the data received as input. This can provide some degree of protection but should not be relied on alone for protection from data manipulation.

There are various techniques attackers can use to evade such filters. Whenever possible, browser-supplied input should be validated to ensure it only contains expected characters. For instance, phone number fields should only be allowed to contain numbers and perhaps a dash or parentheses characters.

Input containing characters outside the expected set should be immediately rejected. These filters should be set up to look for acceptable characters and reject everything else. While all of the methods discussed above are good and work well in browsers, hackers may use special tools to send data directly to the server, thus avoiding client-side validations. This would allow entry of potentially malicious or unverified data to the server. Without additional server-side validation, stored data could be corrupted or replaced with erroneous data.

The recommended best practice for preventing such scenarios is to implement both client and server-side validation. This approach reduces the risk of bad data, while still providing the validation functions on the client that improve results for the end user. Server-only validation can be a nuisance to the user, since it may require filling out online forms multiple times before all validations are passed.

JavaScript validation should be used to inform the user immediately of issues with their input, while server validation ensures only expected data makes its way to the application. Client-side browser script can be very powerful in that it has access to all the content returned by a web application to the browser.

This includes cookies that could potentially contain sensitive data, including user session IDs. To prevent this, most browsers now support the Http-Only attribute on cookies. When the server sets a cookie on the browser, setting the Http-Only attribute tells the browser not to allow access to the cookie from the DOM.

This prevents client-side script-based attacks from accessing the sensitive data stored in those cookies. Local and session storage browser data can also be stolen in the same way, though it cannot be secured through DOM access. It is therefore best to avoid storing sensitive information, such as tokens, in browser storage unless necessary due to specific features of the web application architecture.

Cross-site request forgery CSRF attacks attempt to trick a browser into executing malicious requests on the websites the user is already logged in to, even if the site is not actually opened at that time.

If sessions on the target site are cookie-based, requests to that site can be automatically enriched with authorization cookies. Hackers can also implement their own web pages and have them perform malicious requests to other sites in the background when the user opens it.

The general technique for avoiding this vulnerability is implementing tokenization of client-server communication in which an additional token is introduced that is not stored in cookies. Tokens should be generated for each form on the website upon session establishment and should be sent together with each request while the user is present on the website.

Protecting applications and servers from JavaScript vulnerabilities can be managed through the adoption of JavaScript security best practices and the use of sophisticated scanning tools.

In the world of web development, software engineers must constantly keep on top of new JavaScript security risks that arise.

Not only is it important to conduct functionality tests on applications; using JavaScript security testing tools on a regular basis is also key for preventing vulnerabilities. Last, following some simple and common best practices will definitely increase the durability of your applications.

Identifying potential JavaScript security problems is an essential first step toward preventing vulnerabilities in application development. Test your code with an open-source vulnerability scanner now. The good news is that many potential exploits and attacks can be prevented through writing better and more secure source code. It is essentially Code Security In this section. More in this series JavaScript security Secure coding practices every developer should know The Importance of Code Quality Code security auditing 7 best Java code review tools for developers.

Want to try it for yourself? Book a demo. JavaScript security timelapse 13 min read. Javascript Security Vulnerabilities in The most common JavaScript vulnerabilities include Cross-Site Scripting XSS , malicious code, Man-in-the-middle attack and exploiting vulnerabilities in the source code of web applications. What Is JavaScript Security? Secure your JavaScript code Find and fix vulnerabilities in your application code in real-time during the development process Sign up for free.

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When it comes to application security, in addition to securing your hardware and platform, you also need to write your code securely. This article will explain how to keep your application secure and less vulnerable to hacking. The following are the best habits that a programmer can develop in order to protect his or her application from attack:. While designing your application, you should be striving to guard your app against bad input. Although your app is intended for good people, there is always a chance that some bad user will try to attack your app by entering bad input.

JavaScript Security and Risks

JavaScript is used everywhere today. It runs in your browser as well as in your backend. Besides, JavaScript is a highly dependent ecosystem on third-party libraries. Therefore, securing JavaScript requires following best practices to reduce the attack surface. But, how do we keep JavaScript applications secure? Have you thought about the security risks of doing so? What if the third-party resource has been tampered with? Yes, these are things that can happen when you render external resources on your site. As a result, your site may face a security vulnerability.

What is EME?

When a vulnerability is reported, it immediately becomes our top concern, with a full-time contributor dropping everything to work on it. To report a vulnerability, please email security vuejs. While the discovery of new vulnerabilities is rare, we also recommend always using the latest versions of Vue and its official companion libraries to ensure your application remains as secure as possible. The most fundamental security rule when using Vue is never use non-trusted content as your component template. Doing so is equivalent to allowing arbitrary JavaScript execution in your application - and worse, could lead to server breaches if the code is executed during server-side rendering.

How to Secure Your React.js Application

Moreover, it expands its horizons to protect web services such as APIs from online security threats. In this article, we will discuss web application security, why it is needed, how it works, and what are the best practices for secure web application development. Most of the time, cybercriminals target applications and the associated vulnerabilities. It ensures that best practices are in place to validate user input. The intent is to determine that the source of user input is not malicious and can be processed without posing a threat to information security. Similar to application security best practices, users often need to check for online threats on their personal computers.

WebView security issues in Android applications

Website security requires vigilance in all aspects of website design and usage. This introductory article won't make you a website security guru, but it will help you understand where threats come from, and what you can do to harden your web application against the most common attacks. The Internet is a dangerous place! With great regularity, we hear about websites becoming unavailable due to denial of service attacks, or displaying modified and often damaging information on their homepages. In other high-profile cases, millions of passwords, email addresses, and credit card details have been leaked into the public domain, exposing website users to both personal embarrassment and financial risk. The purpose of website security is to prevent these or any sorts of attacks.

Why Web Application Visibility Is Important to JavaScript Security

It owes its popularity to its omni-platform capabilities, stable frameworks, and inherent ease of use. Through JavaScript, organizations can develop the back-ends and front-ends of dynamic web pages that offer enhanced user experiences such as animations, activity tracking, form submissions, and more. While JavaScript continues to be a popular programming language for web application development, JavaScript vulnerabilities are widely exploited by attackers and malicious users to manipulate data or gain control of web systems. As a result, it takes a focused approach to tackle security concerns that involve activities undertaken to detect, investigate, prevent and solve such vulnerabilities.

Most common JavaScript vulnerabilities and how to fix them

A free and efficient obfuscator for JavaScript including support of ES Make your code harder to copy and prevent people from stealing your work. This tool is a Web UI to the excellent and open source javascript-obfuscator 4. This tool transforms your original JavaScript source code into a new representation that's harder to understand, copy, re-use and modify without authorization. The obfuscated result will have the exact functionality of the original code.

Single-Page Apps

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How JavaScript obfuscation enhances app security

However, in the world of microservices, you can find it pretty much everywhere, playing different and important roles in a bigger application stack. One of the advantages of Node. Additionally, the more popular the framework, the more chances that hackers will try to find vulnerabilities. Therefore, you should always take Node.