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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. yan‏ @bcrypt May 11

      yan Retweeted Alfredo Ortega

      Signal Desktop just pushed out a fix for a remote XSS vuln: https://github.com/signalapp/Signal-Desktop/commit/bfbd84f5d1308cdfcb08a1727821f7103be151ea … demo:https://twitter.com/ortegaalfredo/status/995017143002509313 …

      yan added,

      0:07
      Alfredo Ortega @ortegaalfredo
      Remote zero-click JavaScript code execution on signal desktop message app. Thanks @HacKanCuBa and @julianor pic.twitter.com/YgT8akGfBI
      Show this thread
      3 replies 154 retweets 275 likes
      Show this thread
    2. yan‏ @bcrypt May 11

      a lot of @electronjs devs have the attitude that their app doesn't need sandboxing or keeping up-to-date with Chromium bc "it doesn't execute untrusted code". the problem is that falls apart as soon as you get XSS. https://github.com/signalapp/Signal-Desktop/issues/1635 … (at least Signal has sandboxing)

      4 replies 63 retweets 140 likes
      Show this thread
    3. yan‏ @bcrypt May 11

      "should i build this as a web app or use Electron?" the difficulty gap between XSS and full RCE is much smaller in Electron compared to a browser like up-to-date Chrome, so plz make it a web app if u care about good things

      12 replies 77 retweets 172 likes
      Show this thread
    4. yan‏ @bcrypt May 12

      here's a recent example of XSS -> system RCE in Electron: https://www.trustwave.com/Resources/SpiderLabs-Blog/CVE-2018-1000136---Electron-nodeIntegration-Bypass/ … Electron has a flag that basically says "allow content to run system commands via Node" and it was possible for a context with that flag disabled to open a new context that had it enabled

      3 replies 16 retweets 40 likes
      Show this thread
    5. yan‏ @bcrypt May 12

      at least 3 reasons why XSS -> RCE is easier in Electron vs Chrome: 1. often behind latest Chrome so old 0days will sometimes work (ex: https://blog.ethereum.org/2017/12/15/security-alert-chromium-vulnerability-affecting-mist-browser-beta/ …) 2. no renderer sandboxing by default 3. privilege boundary b/w content with & without Node access is not well-enforced

      4 replies 36 retweets 92 likes
      Show this thread
    6. yan‏ @bcrypt May 12

      the Electron team knows about these issues and have made some great progress lately. in the meantime, keep in mind that it was designed primarily for Atom, an app that doesn't load remote content.

      3 replies 4 retweets 43 likes
      Show this thread
      Andrew Ayer‏ @__agwa May 12
      Replying to @bcrypt

      People don't use Atom to open files that come from remote and/or untrusted sources?

      10:27 AM - 12 May 2018
      • 1 Like
      • kmkz
      1 reply 0 retweets 1 like
        1. New conversation
        2. yan‏ @bcrypt May 12
          Replying to @__agwa

          but they probably don’t execute by default? idk much about atom but they’ve told me most of the issues are not applicable to them

          1 reply 0 retweets 0 likes
        3. Eric Lawrence  🎻‏ @ericlaw May 12
          Replying to @bcrypt @__agwa

          https://statuscode.ch/2017/11/from-markdown-to-rce-in-atom/ …

          1 reply 0 retweets 4 likes
        4. yan‏ @bcrypt May 12
          Replying to @ericlaw @__agwa

          lol didn't know they parse and render markdown

          2 replies 0 retweets 2 likes
        5. *((tweet *) &saleem)‏ @spudowiar May 12
          Replying to @bcrypt @ericlaw @__agwa

          so, atom is like emacs but javascript. can you implement emacs in atom and then atom in emacs and then emacs in atom and then-- InternalError: too much recursionpic.twitter.com/4JtlTAm2SD

          0 replies 1 retweet 2 likes
        6. End of conversation

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