pwnProeasy

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spbctf

Task: overflow a buffer to match a random integer comparison value generated with srand(time(0)). Solution: predict the rand() output by calling glibc srand/rand with the current Unix timestamp via ctypes, then send 64 bytes padding plus the predicted value in little-endian.

$ ls tags/ techniques/
buffer_overflowpwntoolssrandrandomtime_seed
random_number_predictiontime_based_seed_exploitationglibc_rand_reimplementation
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