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__agwa's profile
Andrew Ayer
Andrew Ayer
Andrew Ayer
@__agwa

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Andrew Ayer

@__agwa

Founder of @SSLMate, author of Cert Spotter. I do #webpki and #CertificateTransparency stuff.

San Francisco Bay Area
agwa.name
Joined November 2011

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    1. Andrew Ayer‏ @__agwa Jan 6

      Very dangerous conclusion in this post. Content-Security-Policy does NOT make it safe to run untrusted JavaScript on your site. https://hackernoon.com/im-harvesting-credit-card-numbers-and-passwords-from-your-site-here-s-how-9a8cb347c5b5 … 1/3

      3 replies 46 retweets 55 likes
      Show this thread
    2. Andrew Ayer‏ @__agwa Jan 6

      Even with a 100% locked-down CSP (including experimental navigate-to; probably impractical for most sites), there are likely ways to exfiltrate data using endpoints on the same origin (e.g. new user form with payload in name field + attacker-controlled email) 2/3

      1 reply 9 retweets 15 likes
      Show this thread
      Andrew Ayer‏ @__agwa Jan 6

      CSP is already over-hyped as XSS protection (it's a mitigation; real solution is injection-proof templates). It's irresponsible to say it also lets you run untrusted JavaScript safely. You can't. You HAVE to scrutinize your dependencies. 3/3

      1:42 PM - 6 Jan 2018
      • 6 Retweets
      • 23 Likes
      • Paweł Skarżyński Jason Allen Bob Benschneider koto David Gilbertson Christian Hansen Artur Janc Benjamin Emir Ilhan
      2 replies 6 retweets 23 likes
        1. New conversation
        2. Andrew Ayer‏ @__agwa Jan 6

          Andrew Ayer Retweeted Artur Janc

          https://twitter.com/arturjanc/status/949677592306700288 …

          Andrew Ayer added,

          Artur Janc @arturjanc
          An entertaining article about the dangers of untrusted JS dependencies. But it gets one crucial thing wrong: CSP is absolutely not capable of preventing data exfiltration once the attacker's script runs in the context of your app https://lists.w3.org/Archives/Public/public-webappsec/2016Sep/0012.html … http://www.cse.chalmers.se/~andrei/asiaccs16.pdf … https://twitter.com/D__Gilbertson/status/949563399272361984 …
          Show this thread
          1 reply 2 retweets 4 likes
          Show this thread
        3. Andrew Ayer‏ @__agwa Jan 7

          Now that it doesn't claim CSP is a solution anymore, the article is a pretty good and entertaining read about the risk of dependencies. https://hackernoon.com/im-harvesting-credit-card-numbers-and-passwords-from-your-site-here-s-how-9a8cb347c5b5 … 👍 to @D__Gilbertson for making the correction.

          1 reply 11 retweets 10 likes
          Show this thread
        4. End of conversation
        1. David Gilbertson‏ @D__Gilbertson Jan 6
          Replying to @__agwa

          I've updated the post to roll back my "100% safe" comment (I should have known better). Thanks for the feedback!

          0 replies 0 retweets 0 likes
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