Disable insecure renegotiation
- Windows onlyThis script improves your privacy on Windows
- Single actionThis page belongs to a script, containing basic changes to achieve a task.
- Impact: Medium
System Functionality / Data Loss Risk: Moderate
This action improves privacy with minimal impact when you run the recommended script.
This action improves privacy with some impact when you run the recommended script. - Batch (batchfile)These changes use Windows system commands to update your settings.
- Administrator rights requiredThis script requires privilege access to do the system changes
- Fully reversible
You can fully restore this action (revert back to the original behavior) using this website.
The restore/revert methods provided here can help you fix issues.
Overview
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:
This may cause compatibility issues with older devices or software.
This script is only recommended if you understand its implications.
Some non-critical or features may no longer function correctly after running this script.
This script can be fully reversed to restore changes if something goes wrong.
Sources
- MS10-049: Vulnerabilities in SChannel could allow remote code execution - Microsoft Support. support.microsoft.com. (2024).
Original: https://support.microsoft.com/en-us/topic/ms10-049-vulnerabilities-in-schannel-could-allow-remote-code-execution-d4258037-ad3a-c00c-250f-6c67a408bd7c
Archived: https://web.archive.org/web/20240329131258/https://support.microsoft.com/en-us/topic/ms10-049-vulnerabilities-in-schannel-could-allow-remote-code-execution-d4258037-ad3a-c00c-250f-6c67a408bd7c - RFC 5746 - Transport Layer Security (TLS) Renegotiation Indication Extension. ietf.org. (2024).
Original: https://datatracker.ietf.org/doc/html/rfc5746
Archived: https://web.archive.org/web/20240329131244/https://datatracker.ietf.org/doc/html/rfc5746 - Windows Server team Blog - ISA 2006 / TMG 2010: DISABLE CLIENT-INITIATED SSL RENEGOTIATION, PROTECTING AGAINST DOS ATTACKS AND MALICIOUS DATA INJECTION. blogs.iis.net. (2024).
Original: https://blogs.iis.net/windowsserver/isa-2006-tmg-2010-disable-client-initiated-ssl-renegotiation-protecting-against-dos-attacks-and-malicious-data-injection
Archived: https://web.archive.org/web/20240329131420/https://blogs.iis.net/windowsserver/isa-2006-tmg-2010-disable-client-initiated-ssl-renegotiation-protecting-against-dos-attacks-and-malicious-data-injection - Microsoft Security Advisory: Vulnerability in TLS/SSL could allow spoofing. support.microsoft.com. (2010).
Original: http://support.microsoft.com/kb/977377
Archived: https://web.archive.org/web/20100213193718/http://support.microsoft.com/kb/977377 - NVD - cve-2009-3555. nvd.nist.gov. (2024).
Original: https://nvd.nist.gov/vuln/detail/cve-2009-3555
Archived: https://web.archive.org/web/20240329131308/https://nvd.nist.gov/vuln/detail/cve-2009-3555 - Microsoft Security Advisory (977377): Vulnerability in TLS/SSL Could Allow Spoofing. www.microsoft.com. (2010).
Original: http://www.microsoft.com/technet/security/advisory/977377.mspx
Archived: https://web.archive.org/web/20100212053756/http://www.microsoft.com/technet/security/advisory/977377.mspx
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How to apply or restore "Disable insecure renegotiation" using script
- ≈ 2 min to complete
- Tools: Web Browser
- Difficulty: Simple
- ≈ 5 instructions
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Download the script file by clicking on thebutton above.
Use button above to restore changes. - 2
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Restart your computer for all changes to take effect.
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How to apply or restore "Disable insecure renegotiation" using privacy.sexy
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- ≈ 4 instructions
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- Search for the script name: Disable insecure renegotiation
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Click on ▶️ Run button at the bottom of the page.This button only appears on desktop version (recommended). On browser, use 💾 Save button.
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:: 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"
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Help
How to apply or restore "Disable insecure renegotiation" using commands
- ≈ 2 min to complete
- Tools: Command Prompt
- Difficulty: Medium
- ≈ 3 instructions
- 1
Open Command Prompt
Open Command Prompt as Administrator. - 2
Copy code
Copy the code: - 3
Paste & run
Paste the commands into Command Prompt and press Enter to run.Some changes require a system restart to take effect
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About the Creators
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This guide has undergone comprehensive auditing and peer review:Expert review by undergroundwires
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- Millions of end-users tested across different environments
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We continually monitor our guides, their impact and all other privacy options. We update our guides when new information becomes available. On every update, we publicly store who made the change, what has been changed, why the change was made and when the change was made.