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wdormann's profile
Will Dormann
Will Dormann
Will Dormann
@wdormann

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Will Dormann

@wdormann

Vulnerability Analyst at the CERT/CC. My thoughts are my own, not my employer's.

Joined August 2012

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    1. Parker Thompson‏ @m0thran Mar 6
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      Crash minimization in fuzzing is a fascinating process. We recently implemented a way to reduce inputs and reduce buffer entropy in the CITL fuzzer. Found some fun results already. This is a before / after testcase for a target crash.pic.twitter.com/WTGSmze9Kg

      1 reply 4 retweets 82 likes
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    2. Parker Thompson‏ @m0thran Mar 6
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      Replacing bytes in the input buffers with a pattern (in this case 'A') allows you to quickly identify the important offsets and values in a given buffer. It's simple but I love watching the fully minimized outputs be produced.

      2 replies 0 retweets 12 likes
      Show this thread
    3. Allen Householder‏ @__adh__ Mar 6
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      Replying to @m0thran

      We built this into BFF in 2012 but the animation @wdormann made to show it in 2016 is still one of the most dramatic demos we have given.https://youtu.be/LSP3cbge-9U 

      1 reply 0 retweets 6 likes
    4. Parker Thompson‏ @m0thran Mar 6
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      Replying to @__adh__ @wdormann

      I love that visualization. I'm currently just staring at walls of logs heh.

      1 reply 0 retweets 0 likes
    5. Richard Johnson‏ @richinseattle Mar 7
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      Replying to @m0thran @__adh__ @wdormann

      For a cheap viz, pipe two inputs through xxd and use colored diff. I usually do it to show how the behavior of concolic execution looks when applied to a series of inputs.. you can see a tokenizer loop being solved with diff tokens placed at each offset, etc.

      2 replies 0 retweets 5 likes
      Will Dormann‏ @wdormann Mar 8
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      Replying to @richinseattle @m0thran @__adh__

      What I used to create the video linked earlier in this thread: $ export GREP_COLOR='1;31'; export GREP_COLORS=ne; ls -rt try* | xargs -tn1 -Ixxx bash -c "hexdump -Cv xxx | head -n25 | egrep --color=always '78|x|$' > xxx.ans" $ ls -rt try*.ans | xargs -tn1 ansigo-master

      10:00 AM - 8 Mar 2020
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      2 replies 0 retweets 2 likes
        1. Will Dormann‏ @wdormann Mar 8
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          Replying to @wdormann @richinseattle and

          Then to make it into a video: $ convert -delay 5 -loop 0 try{1..938}.png +map min.gif $ ffmpeg -f gif -i min.gif -pix_fmt yuv420p min.mp4

          0 replies 0 retweets 2 likes
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