reverseProeasy

Basic

spbctf

Task: a stripped 64-bit ELF accepts input and prints Correct! only for one exact string. Solution: identify the custom routine as a Base32 encoder, decode the embedded target string, and account for the newline kept by fgets.

elf64 stripped base32 x86_64 string_comparison

static_analysisstrings_analysisbase32_decoding

$ ls tags/ techniques/

elf64 stripped base32 x86_64 string_comparison

static_analysisstrings_analysisbase32_decoding

Analysis

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

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