reverseProeasy

Intro to Sparc

ringzer0ctf

Task: an easy reverse challenge — a 32-bit big-endian SPARC v8 ELF crackme (uClibc, not stripped) prompting for a hex key and building the flag in show_flag(). Solution: disassemble with Capstone in SPARC big-endian mode, rebuild each 32-bit word from its sethi/or pair, verify with Unicorn SPARC emulation.

static_analysis elf crackme big_endian not_stripped sparc uclibc risc

unicorn_emulationstatic_disassemblycapstone_disassemblysethi_or_constant_reconstructionbig_endian_decode

$ ls tags/ techniques/

static_analysis elf crackme big_endian not_stripped sparc uclibc risc

unicorn_emulationstatic_disassemblycapstone_disassemblysethi_or_constant_reconstructionbig_endian_decode

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.

Permission denied (requires tier.pro)

Sign in to access full writeups

$sign in

$ cat writeup.md…

Sign in to access full writeups

Sign in to access full writeups

Similar writeups