Imagine a scenario where users can input any HTML code into their 'profile' section on a website. How can I ensure that any embedded JavaScript in this HTML does not run?
Is it possible to place an infinite loop for(;;); somewhere as a preventive measure? If so, where should it be placed?
What other potential security risks should be considered when taking this approach?
It's crucial to prevent an infinite loop in order to avoid hanging the browser.
When it comes to PHP, I highly recommend using HTML Purifier to filter out malicious HTML and only allow safe content :)
For Python, Python HTML Sanitizer seems like a promising choice, although I have yet to test it myself. Alternatively, you can check out some DIY HTML sanitizing solutions on this StackOverflow thread that use BeautifulSoup. Just be cautious with the approach mentioned in the first answer, as it lacks an attribute whitelist which is essential for ensuring code safety.
Consider implementing a white-list strategy for secure data display. Begin by HTML-encoding all content within the profile, then selectively decode only approved HTML elements and attributes. This approach ensures that only pre-approved elements can be utilized, effectively preventing any unauthorized code injection attempts.
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