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arturjanc's profile
Artur Janc
Artur Janc
Artur Janc
@arturjanc

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Artur Janc

@arturjanc

Making the web platform more secure one Twitter flamewar at a time.

Zurich, Switzerland
Joined February 2012

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    1. Mike West‏ @mikewest 26 Jan 2017

      `node.innerHTML`'s setter can't execute script, but it can inject an `<iframe srcdoc>` that can. Let's change that: https://github.com/whatwg/html/issues/2300 ….

      4 replies 1 retweet 7 likes
    2. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @mikewest @github

      that innerHTML does not execute script actually causes more CSP bypasses than it prevents XSS.

      1 reply 0 retweets 2 likes
    3. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @slekies @mikewest

      libraries work around these restrictions and eval/recreate all scripts they can find.

      2 replies 0 retweets 1 like
    4. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @slekies @mikewest

      I don't want to see the same behavior for event handlers and friends. It will create more harm than good.

      1 reply 0 retweets 0 likes
    5. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @slekies @mikewest

      that innerHTML does not execute scripts is against the principle of least surprise.

      1 reply 0 retweets 1 like
    6. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @slekies @mikewest

      devs expect that inner_HTML_ executes all of HTML and not just a subset.

      1 reply 0 retweets 0 likes
    7. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @slekies @mikewest

      that's why jquery and other libraries have magic html() methods to replace innerHTML with a function that also executes scripts.

      1 reply 0 retweets 1 like
    8. Sebastian Lekies‏ @slekies 28 Jan 2017
      Replying to @slekies @mikewest

      if you want to strengthen CSP allow scripts in innerHTML and libraries will not implement insecure code for not surprising devs.

      2 replies 0 retweets 0 likes
      Artur Janc‏ @arturjanc 28 Jan 2017
      Replying to @slekies @mikewest

      If libraries hack around hardened, safe APIs against developer intent, the libraries need changing, not the APIs.

      5:31 AM - 28 Jan 2017
      • 1 Like
      • baseband javascript rce nightmare scenario
      1 reply 0 retweets 1 like
        1. New conversation
        2. Sebastian Lekies‏ @slekies 28 Jan 2017
          Replying to @arturjanc @mikewest

          if the API does not fullfill the needs, devs will hack around it. Also innerHTML is not a safe, hardened API.

          1 reply 1 retweet 1 like
        3. Sebastian Lekies‏ @slekies 28 Jan 2017
          Replying to @slekies @arturjanc @mikewest

          these hacks are also not introduced against the devs intend, but for the opposite.

          1 reply 0 retweets 1 like
        4. Artur Janc‏ @arturjanc 28 Jan 2017
          Replying to @slekies @mikewest

          If I set a flag to opt my app into a mode that prevents script execution via parser-based APIs, intent is fairly obvious

          1 reply 0 retweets 0 likes
        5. Artur Janc‏ @arturjanc 28 Jan 2017
          Replying to @arturjanc @slekies @mikewest

          It doesn't get much clearer than a flag that says 'stop-executing-scripts-added-via-parser-based-JS-apis'.

          1 reply 0 retweets 0 likes
        6. Eduardo Vela‏ @sirdarckcat 28 Jan 2017
          Replying to @arturjanc @mikewest

          I think @slekies point is that developers will want both things. Like what happened with ng-csp. It's a valid point IMO

          1 reply 0 retweets 0 likes
        7. Artur Janc‏ @arturjanc 28 Jan 2017
          Replying to @sirdarckcat @mikewest @slekies

          If convenience damages security and developer explicitly chose security, libraries need to conform. Simple.

          1 reply 0 retweets 0 likes
        8. Sebastian Lekies‏ @slekies 28 Jan 2017
          Replying to @arturjanc @sirdarckcat @mikewest

          I was thinking more about the default behavior. But if security is inconvenient, no one will adopt it.

          2 replies 0 retweets 0 likes
        9. Eduardo Vela‏ @sirdarckcat 28 Jan 2017
          Replying to @slekies @arturjanc @mikewest

          FWs will want to *work* when developers "turn on" security features. So they will work around them. Simple.

          1 reply 0 retweets 0 likes
        10. 18 more replies

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