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What serious security threats are there that solely rely on the client JavaScript code that the browser allows? One risk are buggy implementations which can be used to crash the browser or execute code by using heap spraying attacks or similar. These can be kind of mitigated within modern browsers by using ASLR, DEP, sandboxes and similar ...
- What Are The Security Risks Associated With PDF Files
Javascript, embedded multi-media (including, but not limited...
- What Are The Security Issues With "Eval()" in JavaScript
The security issue arises when a 'bad guy' can execute...
- What Are The Security Risks Associated With PDF Files
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Many Internet Web sites contain JavaScript, a scripting programming language that runs on the web browser to make specific features on the web page functional. If JavaScript has been disabled within your browser, the content or the functionality of the web page can be limited or unavailable. This article describes the steps for enabling JavaScript ...
Internet Explorer
To allow all websites within the Internet zone to run scripts within Internet Explorer: 1.On the web browser menu, click Tools or the "Tools" icon (which looks like a gear), and select Internet Options. 2.When the "Internet Options" window opens, select the Security tab. 3.On the "Security" tab, make sure the Internet zone is selected, and then click on the "Custom level..." button. 4.In the Security Settings – Internet Zone dialog box, click Enable for Active Scripting in the Scripting section. 5.When the "Warning!" window opens and asks, "Are you sure you want to change the settings for this zone?" select Yes. 6.Click OK at the bottom of the Internet Options window to close the dialog. 7.Click the Refresh button to refresh the page and run scripts. To allow scripting on a specific website, while leaving scripting disabled in the Internet zone, add the specific Web site to the Trusted sites zone: 1.On the web browser menu, click Tools, or the "Tools" icon (which looks like a gear) and select Internet Options. 2.When the "Internet Options" window opens, select the Security tab. 3.On the "Security" tab, select the Trusted sites zone and then click the Sites button. 4.For the website(s) you would like to allow scripting, enter the address within the Add this website to the zone text box and click Add. Note: If the address does not begin with "https:", you many need to uncheck "Require server verification (https:) for all sites in this zone". 5.Click Close and then click OK at the bottom of the Internet Options window to close the dialog. 6.Click the Refresh button to refresh the page and run scripts.
Google Chrome
To enable JavaScript in Google Chrome, please review and follow the instructions provided at Enable JavaScript in your browser to see ads on your site.
Mozilla Corporation’s Firefox
To enable JavaScript in Firefox, please review and follow the instructions provided at JavaScript settings for interactive web pages.
- Validation and Sanitization of Inputs. Validating and sanitizing user inputs constitutes a pivotal step in securing your JavaScript applications. By implementing robust input validation, you can effectively preempt common vulnerabilities like Cross-Site Scripting (XSS) attacks.
- Steering Clear of Eval() Utilizing the eval() function has emerged as a significant security hazard, given its potential to execute arbitrary code, thereby enabling code injection vulnerabilities.
- Preventing Cross-Site Scripting (XSS) Cross-Site Scripting (XSS) incidents occur when untrusted data is rendered in browsers without adequate escape measures.
- Safeguarding Against Cross-Site Request Forgery (CSRF) To avert CSRF attacks, your JavaScript applications must integrate robust CSRF protection mechanisms.
- Use a JavaScript linter. The easiest and simplest way of avoiding JavaScript security issues is linting your code. Linters are static code analysis tools that check your code for programmatic and stylistic errors, code smells, and known security exploits.
- Audit dependencies using a package manager. To keep third-party JavaScript security vulnerabilities in check, you need to track all the packages you’re using on your website.
- Add Subresource Integrity (SRI) checking to external scripts. As third-party or external scripts can be easily manipulated, checking their integrity before fetching them from the external server is one of the most essential JavaScript security best practices.
- Avoid using inline JavaScript and establish a Content Security Policy. Using inline script tags makes your website or application more vulnerable to cross-site scripting (XSS) attacks.
- Avoid Eval() The function in JavaScript is used to evaluate a string as JavaScript code and execute it. While this function can be convenient for some dynamic programming tasks, it poses a significant security risk when misused.
- Validate and Sanitize Input. Always validate and sanitize user input to prevent cross-site scripting (XSS) and other injection attacks. Example: // the input string const userInput = ""; // sanatize the input string before use const sanitizedInput = userInput.replace(/.*?
- Use Content Security Policy (CSP) CSP helps prevent XSS attacks by controlling which resources can be loaded. Example: Content-Security-Policy: default-src 'self';
- Avoid Inline Event Handlers. Inline event handlers can be a vector for XSS attacks. Example: Avoid this: Instead, use
Jul 6, 2021 · With client-side JavaScript, you can set a breakpoint right where it sets the value. This breakpoint gets hit right as the event fires. The value that gets set through var value = '2'; can change at will. The debugger halts execution and allows a person to tamper with the page.
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May 10, 2024 · While not all of these are JavaScript-related, many of the recurring issues we see each year could be avoided by prioritizing JavaScript security. Let’s review some of the common JavaScript vulnerabilities, many of which have, and continue to, appear on the list. 1. Cross-Site Scripting (XSS)
