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_niklasb's profile
Niklas B
Niklas B
Niklas B
@_niklasb

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Niklas B

@_niklasb

Security research & CTF @phoenhex @KITCTF @EatSleepPwnRpt. Pwn2Own '17 & '18.

github.com/niklasb
Joined December 2016

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    1. Calle Svensson‏ @ZetaTwo Sep 26

      Calle Svensson Retweeted Murmus

      Unfortunately, I didn't solve it in the end. I lacked one crucial piece of knowledge and that led me down a way more complicated path instead of finding the easy solution. Was fun to participate and I'm really looking forward to the summary and analysis.https://twitter.com/MurmusCTF/status/1044628943645683713 …

      Calle Svensson added,

      Murmus @MurmusCTF
      Woo! About 45 minutes in and @ZetaTwo has an arbitrary read!
      Show this thread
      2 replies 0 retweets 9 likes
      Show this thread
    2. Niklas B‏ @_niklasb Sep 26
      Replying to @ZetaTwo

      What was it that was lacking?

      1 reply 0 retweets 0 likes
    3. Calle Svensson‏ @ZetaTwo Sep 26
      Replying to @_niklasb

      I didn't know how to go from arbitrary read to leaking a stack address. 😣

      1 reply 0 retweets 0 likes
    4. spq‏ @__spq__ Sep 26
      Replying to @ZetaTwo @_niklasb

      in which context? libc in memory?

      1 reply 0 retweets 0 likes
      Niklas B‏ @_niklasb Sep 26
      Replying to @__spq__ @ZetaTwo

      Good old environ pointer :) I actually have a tool on github for situations like these where we want to find pointers to a certain memory region in the process memory. More useful for larger software, but sometimes helps in CTFs toohttps://github.com/niklasb/bingrep 

      5:01 AM - 26 Sep 2018
      • 8 Likes
      • missing Jai Verma aohwang FeDEX Thanasin Luangpipat Seamus Andreas Schmidt Jacob Soo
      1 reply 0 retweets 8 likes
        1. New conversation
        2. Calle Svensson‏ @ZetaTwo Sep 26
          Replying to @_niklasb @__spq__

          Cool. Gotta check it. Yes so the situation was that I had base address of binary and arbitrary read and thus had libc base as well for example. Unfortunately I didn't know about the environ thing. I assumed there was a way but I failed to figure it out.

          1 reply 0 retweets 0 likes
        3. Bruno Keith‏ @bkth_ Sep 26
          Replying to @ZetaTwo @_niklasb @__spq__

          I also wrote https://github.com/bkth/gdb-addons  for that exact purpose, especially useful for relative oob accesses.

          0 replies 0 retweets 3 likes
        4. End of conversation

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