Avast Antivirus: Updating Windows to fix the EternalBlue vulnerability and prevent the DoublePulsar attack

How to update Windows to resolve the EternalBlue vulnerability and prevent the DoublePulsar attack

Wi-Fi Inspector or Smart Scan in Avast Antivirus may have detected that your PC is vulnerable or has been subjected to the DoublePulsar attack which is used by WannaCry ransomware and other malicious threats. This means that your PC is running an outdated version of the Windows File and Printer Sharing service (SMB), which contains a vulnerability known as EternalBlue. The vulnerability can be resolved by installing the MS17-010 security update.

Installing the MS17-010 security update

To install the MS17-010 security update, follow the steps according to your version of Windows.

Before installing the MS17-010 security update, disconnect from the network and restart your PC. If the Double Pulsar exploit is already present, attempting these resolution steps without disconnecting from the network and restarting your PC could prevent your PC from starting.
  1. Click the relevant link below to download the Microsoft security update, then save it to your desktop:
  2. Click the relevant link below to download the Microsoft security update, then save it to your desktop:
  3. Click the link below to download the Microsoft security update, then save it to your desktop:
  4. Click the link below to download the Microsoft security update, then save it to your desktop:
  5. Click the link below to download the Microsoft security update, then save it to your desktop:
  6. Important: Disconnect your PC from the network by disconnecting the network cable or turning off WiFi, then restart your PC.
  7. After your PC restarts, run the installer you saved to your desktop in step 1.
  8. Restart your PC again to complete the installation process.
  9. Reconnect to the network.
  10. Open the Avast user interface and run the Wi-Fi Inspector Scan (ProtectionWi-Fi InspectorNetwork Scan) to confirm your PC is no longer vulnerable.

If the above troubleshooting steps do not work, try one of the following alternative solutions:

  • Restart your PC and go to Windows Updates (Start Menu ▸ Settings ▸ Update and Security ▸ Check for updates). Install any available updates, then run the Wi-Fi Inspector scan to confirm your PC is no longer vulnerable.
  • Restart your PC and go to Windows Updates (Charms menu ▸ Settings ▸ Change PC settings ▸ Windows Update ▸ Check for updates now). Install any available updates, then run the Wi-Fi Inspector scan to confirm your PC is no longer vulnerable.
  • Restart your PC and go to Windows Updates (Start menu ▸ Control Panel ▸ System & Security ▸ Windows Update ▸ Check for updates). Install any available updates, then run the Wi-Fi Inspector scan to confirm your PC is no longer vulnerable.
  • Restart your PC and go to Windows Updates (Start menu ▸ Control Panel ▸ Security ▸ System & Security ▸ Windows Update ▸ Check for updates). Install any available updates, then run the Wi-Fi Inspector scan to confirm your PC is no longer vulnerable.
  • If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:
  • If you are unable to install the update, the only other way to fix this vulnerability is to disable the Windows file sharing service, specifically version 1 of the SMB protocol. Refer to the following Microsoft guide to disable SMBv1:
    • Avast Premier 17.x
    • Avast Internet Security 17.x
    • Avast Pro Antivirus 17.x
    • Avast Free Antivirus 17.x
    • Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
    • Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
    • Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
    • Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1, 32 / 64-bit
    • Microsoft Windows Vista Home Basic / Home Premium / Business / Enterprise / Ultimate - Service Pack 2, 32 / 64-bit
    • Microsoft Windows XP Home / Professional / Media Center Edition - Service Pack 3, 32-bit

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