reverseProeasy

Narkoman

sbpctf

Task: a Linux ELF binary asks us to pass all checks before it connects to a remote service. Solution: statically recover the required TASK_PORT argument, solve the quadratic check to get hexadecimal port 15b3, and query the server to receive the flag.

$ ls tags/ techniques/

elf64 static_analysis linux_elf network_client argv_parsing arithmetic_check

static_analysisinteger_equation_solvingparameter_reconstruction

Analysis

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

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