$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: x86-64 shared library validating MD5(password + uname release + 20-char constant) with position byte checks. Solution: GCC .comment fingerprint pinned Ubuntu 12.10 kernel 3.5.0-XX; constraint math forced a 6-char password; hashcat GPU mask attack recovered rZ1a7k / 3.5.0-47-generic.
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