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berendjanwever's profile
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹
@berendjanwever

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𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹

@berendjanwever

ASCII art evangelist | motivational coder | full stack IoT blockchain machine learning cyber-cloud threat actor | berendj@nwever.nl | http://skylined.nl/gpg 

 🇳🇱 The Netherlands
blog.skylined.nl
Joined June 2009

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    1. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 8
      Replying to @symeonp

      Yeah, I'll get you one as soon as I'm over the flu 🤒

      1 reply 0 retweets 0 likes
    2. symeon‏ @symeonp Jan 8
      Replying to @berendjanwever

      Hey, thank you so much and get well soon!

      1 reply 0 retweets 0 likes
    3. symeon‏ @symeonp Jan 11
      Replying to @symeonp @berendjanwever

      Hey skylined, are you feeling better? Are you still happy to share a null-ptr case? Chrome/Edge would be great if you don't mind! 😅 Working on how to catch those crashes with python twisted/subprocess ain't that easy!

      2 replies 0 retweets 0 likes
    4. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 11
      Replying to @symeonp

      Yeah, *finally* better... Why not use BugId to detect crashes in Python? This crashes Edge for me: <m><iframe width=99999280>

      1 reply 0 retweets 2 likes
    5. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 11
      Replying to @berendjanwever @symeonp

      Let me know if you need an MSIE crasher... what I have atm doesn't fit a tweet and I don't want to spent time reducing it unless I need to. Btw. I meant use cBugId in Python; BugId is just a wrapper, cBugId is the engine.

      1 reply 0 retweets 0 likes
    6. symeon‏ @symeonp Jan 11
      Replying to @berendjanwever

      Hm interesting I'll give it a try! For chrome, I am using ASAN and it looks like I got it (almost) working, nothing fancy though! Yes if you could still send me a case (via email) would be also great - was about to use winappdbg for Edge/IE. Thanks so much!

      1 reply 0 retweets 0 likes
    7. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 12
      Replying to @symeonp

      BugId has support for parsing ASan output, so you'll get similar error reports for Chrome, Chrome Asan, Edge, IE, Firefox, whatever...

      1 reply 0 retweets 0 likes
    8. symeon‏ @symeonp Jan 12
      Replying to @berendjanwever

      Sure, but it requires me to have the test case, it wouldn’t work while I’m fuzzing it, would it?

      1 reply 0 retweets 0 likes
    9. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 12
      Replying to @symeonp

      Sure it would: I use it during fuzzing on my VMs myself! It debugs your application while you do whatever you want with it. When it detects a bug, it generates a report and calls a callback. BugId uses it to and dumps the report details to console and file.

      1 reply 0 retweets 1 like
    10. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 12
      Replying to @berendjanwever @symeonp

      If you want to use it during fuzzing, you copy code from BugId.py: 1) create a cBugId instance, 2) set the "Bug report" callback, 3) call fStart() to start the application 4) fuzz until application crashes => your callback gets called with details 5) call fStop() when finished.

      2 replies 0 retweets 4 likes
      𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 12
      Replying to @berendjanwever @symeonp

      Fuzzzing happens during step 4 for me: browser makes request, server generates JS on the fly and sends it in response, browser eval()s it and returns results, repeat until crash. If no crash after N rounds, call fStop() and start cleanly

      3:26 AM - 12 Jan 2018
      • 1 Like
      • fkz
      1 reply 0 retweets 1 like
        1. New conversation
        2. symeon‏ @symeonp Jan 12
          Replying to @berendjanwever

          I am doing more or less the same, with the exception that I'm storing the cases in an array (a bit slow but it works) as I don't want to mess with JS stuff. Out of curiosity after how many rounds do you start cleanly?

          1 reply 0 retweets 0 likes
        3. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jan 12
          Replying to @symeonp

          That depends on various factors. If each round is large, the combined repro file becomes large quickly, less rounds are advised. If I require a lot of state to build-up, more rounds are needed. In general I pick a random number from a range based on educated guessing.

          1 reply 0 retweets 0 likes
        4. symeon‏ @symeonp Jan 12
          Replying to @berendjanwever

          Brilliant, that makes sense! Thanks again! 🙂

          0 replies 0 retweets 0 likes
        5. End of conversation

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