HTML5 Security Cheat Sheet

https://www.owasp.org/index.php/HTML5_Security_Cheat_Sheet

by dhruvbhatia • 11 years ago

75 8 11 years ago

I've tried to get Content Security Policy (CSP) rolled out in our new development at work, and to be frank I'm starting to lose faith that it is workable.

We're on report only at the moment, and it seems like every major JavaScript library depends on Eval() in one way or another (mostly new function()).

Just this week someone wanted to use Angular (1.3.1) and it generates dozens of CSP reports without ng-csp in the HTML element, but when the attribute exists $http responses (which depend on function()) aren't working (e.g. success(function(data, status, headers, config) {}).

Unfortunately Angular's documentation on CSP is a single page with nothing particularly helpful, and tons of stackoverflow results about Google Chrome extension development.

This is just the tip of the iceberg. Seems like every single major JavaScript library (even things you just take for granted) break CSP or need tons of exceptions.

homborg• 11 years ago

As far as I can tell, the are no issues with the `function` keyword in csp mode, but the `Function` constructor, eg.

`Function("a", "console.log(a);")`

Your example is a callback with an anonymous function.

Do you have any links to discussions about your issue?

AgentME• 11 years ago

Just turn on CSP's unsafe-eval option. You still get the XSS attack prevention unless your code is doing something very silly already and eval'ing stuff from the DOM.

borski3• 11 years ago

You can scan for a huge chunk of this with https://www.tinfoilsecurity.com, and we're adding more every day. Most importantly, you should make it a regular part of your Dev cycle.

Note: this isn't an ad, it just seemed relevant to those interested in a "cheat sheet." Automating it by calling out to our API seems really relevant. :)

passfree• 11 years ago

The problem with your approach is that you are assuming that people are fine that scan for in production for security issues. While it is true that everyone does it, this arguments falls flat because there are plenty of systems which will avoid the risk and for good reasons.

borski3• 11 years ago

Nope, in fact you can scan in staging or Dev too, by using Bifrost: https://www.tinfoilsecurity.com/developer/bifrost

Mahn• 11 years ago

Not a big fan of being forced to sign up to see the results of the free test.

borski3• 11 years ago

I really really wish this didn't have to be the case. Legally, in order for us to show you results, we have to verify you have authorization / own the site. Part of doing that is to make you register. If we could show results without making you register and verify, we would, but we'd be on very very shaky legal ground if we did, for obvious reasons.

HTML5 Security Cheat Sheet

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