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.

elf x86-64 columnar_transposition not_stripped string_comparison nested_loop dynamically_linked

disassemblystatic_binary_analysiscolumnar_transposition_reversalnested_loop_analysis

$ ls tags/ techniques/

elf x86-64 columnar_transposition not_stripped string_comparison nested_loop dynamically_linked

disassemblystatic_binary_analysiscolumnar_transposition_reversalnested_loop_analysis

Analysis

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

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[reverse][Pro]ron (RE3_ron)— rev_kids20
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