Simon Willison’s Weblog

Items tagged quora, security, xss

Filters: quora × security × xss ×


What Javascript tools are there for cleansing input?

Don’t cleanse. Escape instead.

[... 18 words]

What are the best practices to avoid XSS and SQL Injections attacks (platform agnostic)?

Input validation is, in my opinion, a red herring. Sure—if you ask the user for an integer or date you should make sure they entered one before attempting to save it anywhere or use it for processing, but injection attacks often involve text fields (e.g. names, or comments posted on Quora) and validating those on input is a recipe for banning “Tim O’Reilly” from ever creating a proper profile on your site!

[... 316 words]

Why are XSS attacks spreading like fire these days?

XSS attacks are common and easy, and crop up all the time. What’s new is that the number of people who are aware of the potential for XSS worms has increased hugely, so when an XSS does crop up in something popular there’s a much higher chance of someone turning it in to a worm (as happened with Twitter the other day).

[... 96 words]

Why do some people disable JavaScript in their browser?

For security reasons.

[... 159 words]

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