pwnPromedium

Tsar Admin

hackerlab

Task: a console admin login contains a one-byte overflow in the PIN input, and the archive includes a password generator seeded with time(NULL). Solution: flip a nearby flag with 133\\x01 to leak the seed, then reproduce Alpine 3.18.2 musl rand() to predict the correct temporary admin password.

x86_64 prng rand alpine musl one_byte_overflow seed_leak remote_service

off_by_one_flag_flipseed_leak_exploitationmusl_rand_reimplementationpassword_prediction

$ ls tags/ techniques/

x86_64 prng rand alpine musl one_byte_overflow seed_leak remote_service

off_by_one_flag_flipseed_leak_exploitationmusl_rand_reimplementationpassword_prediction

Analysis

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$ python3 exploit.py --target 192.168.1.1 --port 8080
[*] Connecting to target...
[+] Shell obtained!

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