reverseProeasy

sparta

spbctf (rev-kids20)

Task: 64-bit ELF binary with columnar transposition cipher (stride 7) on input. Solution: reverse the column-by-column reading order to recover the flag from scrambled string.

$ ls tags/ techniques/

elf x86-64 columnar_transposition not_stripped string_comparison nested_loop dynamically_linked

disassemblystatic_binary_analysiscolumnar_transposition_reversalnested_loop_analysis

Analysis

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

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

Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

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