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wycats's profile
Yehuda Katz 🥨
Yehuda Katz 🥨
Yehuda Katz  🥨
Verified account
@wycats

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Yehuda Katz  🥨Verified account

@wycats

Tilde Co-Founder, OSS enthusiast and world traveler.

Portland, OR
yehudakatz.com
Joined August 2007

Tweets

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    1. Rafael Dorado‏ @MrFlopis 14 Apr 2017
      Replying to @wycats @jlongster

      Same thoughts here, I wouldn't want to expose all the actions of my page to a future attacker.

      2 replies 0 retweets 2 likes
    2. James Long‏ @jlongster 14 Apr 2017
      Replying to @MrFlopis @wycats

      I seriously don't get this at all. Are you saying you want to write web apps in C and compile it webasm to obscure everything?

      1 reply 0 retweets 3 likes
    3. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
      Replying to @jlongster @MrFlopis

      I don't mind debugging tools that work on production apps. Same origin hole feels dangerous here, but that ship has sailed.

      2 replies 0 retweets 0 likes
    4. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
      Replying to @wycats @jlongster @MrFlopis

      If everyone agreed that JS code on the internet should be considered public and should never include authenticated content we'd agree 💯

      1 reply 0 retweets 7 likes
    5. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
      Replying to @wycats @jlongster @MrFlopis

      That's my perspective, but lots of people continue to try to defend the "authenticated JS code" perspective, which is ridiculous.

      4 replies 0 retweets 1 like
    6. James Long‏ @jlongster 14 Apr 2017
      Replying to @wycats @MrFlopis

      I don't think there's any way we can obscure things enough for any run-time inspection to be lessened. JS is too easy to monkey-patch

      1 reply 0 retweets 4 likes
    7. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
      Replying to @jlongster @MrFlopis

      And F.p.toString. Once you have a module registry it's game over.

      1 reply 0 retweets 1 like
    8. James Long‏ @jlongster 14 Apr 2017
      Replying to @wycats @MrFlopis

      Are you saying some people argue that their JS code is safe, even if a 3rd party can run JS on the same origin?

      1 reply 0 retweets 1 like
    9. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
      Replying to @jlongster @MrFlopis

      I'm saying some people believe that it's important to make "authenticated modules" a thing. Which is crazy.

      1 reply 0 retweets 0 likes
    10. James Long‏ @jlongster 14 Apr 2017
      Replying to @wycats @MrFlopis

      Never heard that term before :) I feel like there's some context I'm missing! But I agree with you.

      1 reply 0 retweets 0 likes
      Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
      Replying to @jlongster @MrFlopis

      Let me back the truck up. Today, for web-compat, <script> by default sends cookies, allowing websites to include secret, authed data 1/

      7:15 PM - 14 Apr 2017
      • 4 Likes
      • Saniya Tech Jon Kuperman Michael Head Ian De La Cruz
      2 replies 0 retweets 4 likes
        1. James Long‏ @jlongster 14 Apr 2017
          Replying to @wycats @MrFlopis

          (Totally read that as back the f*** up)

          0 replies 0 retweets 1 like
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        2. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          However, today, this is an extremely dubious practice, because of how easy it is for a third party origin to use a <script> to execute 2/

          1 reply 0 retweets 2 likes
        3. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          the code on *their* domain (http://evil.com ) with the user's credentials (say, for http://bank.com ). The most obvious 3/

          1 reply 0 retweets 0 likes
        4. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          issue is Function.prototype.toString, which allows you to see the contents of any function. So the exploit is: be aware that 4/

          1 reply 0 retweets 0 likes
        5. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          http://bank.com/account.js  contains authenticated, secret account data, <script src="http://bank.com/account.js "> on http://evil.com  5/

          1 reply 0 retweets 1 like
        6. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          Now you might be thinking, this seems like an awfully obscure exploit. But if http://bank.com  uses a module registry, that 6/

          1 reply 0 retweets 1 like
        7. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          <script> will populate a global `__registry__` (or something like it) on *http://evil.com * but with the user's 7/

          1 reply 0 retweets 0 likes
        8. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          *http://bank.com * cookies. So basically, it's a bad idea to use cookies as auth to put secret content in a JS file. 8/

          1 reply 0 retweets 0 likes
        9. Yehuda Katz  🥨‏Verified account @wycats 14 Apr 2017
          Replying to @wycats @jlongster @MrFlopis

          Even if you think you're safe, someone else can decide to switch to webpack and pwn you. So don't do it (put the secret in HTML instead) 9/

          2 replies 0 retweets 1 like
        10. 4 more replies

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