![]() ![]() In order to be more helpful, provide a prominent way to contact a human in case an error should arise. Instead of returning “Your password for this account is incorrect,” try the more ambiguous feedback “Incorrect login information,” and avoid revealing whether the username or email is in the system. When dealing with accounts, emails, and PII, it’s most secure to err (?) on the side of less. While it may seem helpful to let users know whether a piece of data exists, it’s also very helpful to attackers. For more, see 1.3.5: Identify Input Purpose in WCAG 2.1. If your project must be WCAG compliant, disabling autocomplete can break your input for different modalities. It’s important to also weigh your risk profile against its trade-offs. Use these fields sparingly, and disable autofilled forms for particularly sensitive data. Many users aren’t even aware what information their browser’s autofill has stored up. Exploits using hidden fields can harvest PII previously captured by an autocomplete field. Autofill form fields can be convenient - for both users and attackers. When a user chooses to give you their Personally Identifiable Information (PII), it should be a conscious choice. Hiding checkboxes can be a neat hack for creating CSS-only switches, but hidden fields do little to contribute to security. With tools like ZapProxy and even inspection tools in plain ol’ web browsers, users can easily click to reveal tasty bits of invisible information. Beware of hidden fieldsĪdding type="hidden" is an enticingly convenient way to hide sensitive data in pages and forms, but unfortunately not an effective one. Don’t directly return any input to your site without thorough validation or sanitization.įor some further guidance on battling injection attacks, see the OWASP Injection Prevention Cheat Sheet. One of the fastest viruses to proliferate was the Samy worm on MySpace (yes, I’m old), thanks to code that Samy Kamkar was able to inject into his own profile page. While it may not be intuitive, even data that a user submits to their own area on a site should be validated. Sanitizing data can be done by removing or replacing contextually-dangerous characters, such as by using a whitelist or escaping the input data. Frameworks like Django also help by providing field types for this purpose. You can validate input by constraining it to known values, such as by using semantic input types or validation-related attributes in forms. To combat vulnerabilities like injection, it’s important to validate or sanitize user input. Control user inputĪ whole whack of crazy things can happen when developers build a form that fails to control user input. ![]() Here are a few areas of focus for front-end developers who want to help fight the good fight. While cybersecurity is often thought of in terms of databases and architecture, much of a strong security posture relies on elements in the domain of the front-end developer.įor certain potentially devastating vulnerabilities like SQL injection and Cross-Site Scripting (XSS), a well-considered user interface is the first line of defense. ![]()
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