Disable insecure renegotiation

Overview

About this script

This script improves your privacy on Windows.

These changes use Windows system commands to update your settings.

This script enhances your security by reducing risks associated with secure communications. By running this script, you proactively enhance your online privacy and secure against well-known TLS vulnerabilities.

TLS secures internet communications. It allows parties such as browsers and websites to update their encryption settings through renegotiation 2. Without safeguards, attackers could intercept and compromise these communications 1 2 3 4 5 6.

Insecure renegotiation can let attackers hijack communications from the start, enabling unauthorized control 1, data manipulation 3 6, DoS attacks 3, and identity spoofing 4 5 6.

To counter these threats, this script implements measures standardized in RFC 5746 1 2, effectively closing the loophole that allowed these vulnerabilities.

This script enhances security by blocking insecure renegotiation attempts and aims to improve compatibility with older software. It modifies the following system settings to achieve this:

• HKLM\System\CurrentControlSet\Control\SecurityProviders\SCHANNEL!AllowInsecureRenegoClients 1 3: Stops the client from responding to insecure renegotiation attempts 1 3.
• HKLM\System\CurrentControlSet\Control\SecurityProviders\SCHANNEL!AllowInsecureRenegoServers 1 3: Stops the server from responding to insecure renegotiation attempts 1 3.
• HKLM\System\CurrentControlSet\Control\SecurityProviders\SCHANNEL!DisableRenegoOnClient 3 4: Prevents the client from initiating or responding to insecure renegotiation requests 3 4.
• HKLM\System\CurrentControlSet\Control\SecurityProviders\SCHANNEL!DisableRenegoOnServer 3 4: Prevents the server from initiating or responding to insecure renegotiation requests 3 4.
• HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!UseScsvForTls 1: Enhances compatibility with older software, preventing potential communication issues 1.

This script may impact the functionality of software using outdated and insecure communication methods 3. Affected software includes older versions of:

• Internet Explorer 3 4
• Internet Information Services (IIS) 3 4
• Exchange ActiveSync 3 4
• Outlook 3

Caution

This may cause compatibility issues with older devices or software.

This script uses Batch (batchfile) scripting language.

Use with Caution

This script is only recommended if you understand its implications. Some non-critical or features may no longer function correctly after running this script.

Implementation Details

• Language: batch

• Required Privileges: Administrator rights

• Compatibility: Windows only

• Reversibility: Can be undone using provided revert script

Explore Categories

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Improve network security

This action belongs to Improve network security category. This category is dedicated to improving network security. It aims to minimize vulnerabilities by offering various settings that improve the integrity and confidentiality of data transmitted over the network. It features a range of measures to protect data transmission from unauthorized access,... Read more on category page ▶

Security improvements

This action belongs to Security improvements category. This category encompasses a range of scripts designed to improve the security of your system by enforcing security best practices. These scripts help protect your system against various types of cyber threats and unauthorized access. Read more on category page ▶

Apply now

Choose one of three ways to apply:

1. Automatically via privacy.sexy: The easiest and safest option.
2. Manually by downloading: Requires downloading a file.
3. Manually by copying: Advanced flexibility.

Alternative 1. Apply with Privacy.sexy

privacy.sexy is free and open-source application that lets securely apply this action easily.

Open privacy.sexy

You can fully restore this action (revert back to the original behavior) using the application.

privacy.sexy instructions

1. Open or download the desktop application
2. Search for the script name: Disable insecure renegotiation.
3. Check the script by clicking on the checkbox.
4. Click on Run button at the bottom of the page.

Alternative 2. Download

Irreversible Changes

This script is irreversible, meaning there is no straightforward method to restore changes once applied. Exercise caution before running, restoring it may not be possible.

1. Download the script file by clicking on the button below:

   Download script

2. Run the script file by clicking on it.

Download revert script

This file restores your system to its original state, before this script is applied.

Download restore script

Alternative 3. Copy

This is for advanced users. Consider automatically applying or downloading the script for simpler way.

1. Open Command Prompt as administrator.

HELP: Step-by-step guide

1. Click on Start menu

   Windows 11

   

   Windows 10

   

2. Type cmd

   Windows 11

   

   Windows 10

   

3. Right click on Command Prompt select Run as administrator

   Windows 11

   

   Windows 10

   

4. Click on Yes to run Command Prompt

   Windows 11

   

   Windows 10

   

---

Windows 11

Windows 10

2. Copy the following code:

Code to apply changes

:: Set the registry value: "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!AllowInsecureRenegoClients"
PowerShell -ExecutionPolicy Unrestricted -Command "$registryPath = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL'; $data = '0'; reg add 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'AllowInsecureRenegoClients' /t 'REG_DWORD' /d "^""$data"^"" /f"
:: Set the registry value: "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!AllowInsecureRenegoServers"
PowerShell -ExecutionPolicy Unrestricted -Command "$registryPath = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL'; $data = '0'; reg add 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'AllowInsecureRenegoServers' /t 'REG_DWORD' /d "^""$data"^"" /f"
:: Set the registry value: "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!DisableRenegoOnServer"
PowerShell -ExecutionPolicy Unrestricted -Command "$registryPath = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL'; $data = '1'; reg add 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'DisableRenegoOnServer' /t 'REG_DWORD' /d "^""$data"^"" /f"
:: Set the registry value: "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!DisableRenegoOnClient"
PowerShell -ExecutionPolicy Unrestricted -Command "$registryPath = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL'; $data = '1'; reg add 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'DisableRenegoOnClient' /t 'REG_DWORD' /d "^""$data"^"" /f"
:: Set the registry value: "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!UseScsvForTls"
PowerShell -ExecutionPolicy Unrestricted -Command "$registryPath = 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL'; $data = '1'; reg add 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'UseScsvForTls' /t 'REG_DWORD' /d "^""$data"^"" /f"

3. Right click on command prompt to paste it.
4. Press Enter to apply remaining code.

Copy restore code

Copy and run the following code to restore changes:

Revert code

:: Delete the registry value "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!AllowInsecureRenegoClients"
PowerShell -ExecutionPolicy Unrestricted -Command "reg delete 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'AllowInsecureRenegoClients' /f 2>$null"
:: Delete the registry value "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!AllowInsecureRenegoServers"
PowerShell -ExecutionPolicy Unrestricted -Command "reg delete 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'AllowInsecureRenegoServers' /f 2>$null"
:: Delete the registry value "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!DisableRenegoOnServer"
PowerShell -ExecutionPolicy Unrestricted -Command "reg delete 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'DisableRenegoOnServer' /f 2>$null"
:: Delete the registry value "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!DisableRenegoOnClient"
PowerShell -ExecutionPolicy Unrestricted -Command "reg delete 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'DisableRenegoOnClient' /f 2>$null"
:: Delete the registry value "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL!UseScsvForTls"
PowerShell -ExecutionPolicy Unrestricted -Command "reg delete 'HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL' /v 'UseScsvForTls' /f 2>$null"

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