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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 May 28

      Debugging https://bugs.chromium.org/p/project-zero/issues/detail?id=1534 …, I see a NULL ptr rather than an obvious Use-After-Free. Is @ChakraCore not using the Windows Heap and does page heap therefore not apply to Chakra allocations? Is there a way to force Chakra to use the Windows heap so I can use page heap?

      1 reply 1 retweet 19 likes
    2. Johnathan Norman‏ @spoofyroot May 28
      Replying to @berendjanwever @ChakraCore

      You want -pageheap:2 on test or debug builds.

      1 reply 0 retweets 7 likes
    3. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever May 28
      Replying to @spoofyroot @ChakraCore

      Is there a test or debug build of Edge? If so where do I find it and how do I pass arguments seeing as UWP apps only accept one argument.

      1 reply 0 retweets 0 likes
    4. Johnathan Norman‏ @spoofyroot May 28
      Replying to @berendjanwever @ChakraCore

      I don't think there are any public debug builds of Edge. Unfortunately if you want pageheap for the chakra heap you are limited to ch.exe.

      1 reply 0 retweets 1 like
    5. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever May 28
      Replying to @spoofyroot @ChakraCore

      That's bad news as it effectively means that one cannot really debug this issue or any other issue that involves browser APIs. Also, all the null pointers I found are now suspect; any one of them may hide a UAF :/

      2 replies 1 retweet 1 like
    6. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever May 29
      Replying to @berendjanwever @spoofyroot @ChakraCore

      @msftsecresponse I have repros for many NULL pointers in regular builds of Edge but root cause could be vuln (see thread). There is no public debug build for me to find out. Should I just report them all to you as potential security issues? Not ideal obviously; please advice.

      1 reply 0 retweets 0 likes
    7. Security Response‏Verified account @msftsecresponse May 29
      Replying to @berendjanwever @spoofyroot @ChakraCore

      Thanks for asking. Please go ahead and report them at secure@ and we'll give them to the product team.

      1 reply 0 retweets 0 likes
      𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever May 29
      Replying to @msftsecresponse @spoofyroot @ChakraCore

      I have not recorded NULL pointers/Asserts recently but I used to find a couple every day. I will try to reduce the repros, are you positive this is what you want?

      10:58 AM - 29 May 2018
      1 reply 0 retweets 0 likes
        1. New conversation
        2. 𝓢𝓀𝓎𝓛𝒾𝓃𝑒𝒹‏ @berendjanwever Jun 1
          Replying to @berendjanwever @msftsecresponse and

          On second though this would require a massive investment of time on my side with no benefit other than a slim chance of getting a vuln fixed at some point. I think there are better ways for me to work in security, so I will not be going this route after all.

          1 reply 0 retweets 1 like
        3. 1 more reply

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