Hello,
We’ve been scanning some of our internal servers with Qualys recently and its picked up a few vulnerability, specifically related to TLS 1 and SSL.
So after a bit of Googling I found this post:
https://dawnbringer.net/blog/1018/SSL_All_The_Things!_Windows_-_IIS
This fixes the vulnerabilities via PowerShell.
Since then I’ve modified it to work remotely.
To run the script, make a csv with the servers in:
if (! $cred1){ $cred1 = Get-Credential -Message "Please provide domain admin credentials" } Import-Csv "c:\temp\tcp_vun.csv"| ForEach-Object { write-host "Computer: $($_.computer) staring" ################################################# #If you are going to want to use CredSSP below, then enable it by uncommenting this next bit. ################################################# #$session = New-PSSession -cn $_.computer -Credential $cred1 #invoke-Command -session $session -scriptblock{ Enable-WsManCredSSP -Role Server -Force} #remove-pssession $session ################################################# #Pick one of the following session types, if you are doing some remote tasks in the remote command you will need the Credssp method ################################################# #$session = New-PSSession -cn $_.computer -Credential $cred1 -Authentication Credssp -ErrorAction SilentlyContinue #### TRY 1st#####################: $session = New-PSSession -cn $_.computer -Credential $cred1 invoke-Command -session $session -Scriptblock { Write-Host 'Configuring SCHANNEL protocols' -NoNewline # Disable Multi-Protocol Unified Hello New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\Multi-Protocol Unified Hello\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\Multi-Protocol Unified Hello\Server' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\Multi-Protocol Unified Hello\Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\Multi-Protocol Unified Hello\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\Multi-Protocol Unified Hello\Client' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\Multi-Protocol Unified Hello\Client' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Disable PCT 1.0 New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Client' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\PCT 1.0\Client' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Disable SSL 2.0 (PCI Compliance) New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Disable SSL 3.0 (PCI Compliance) and enable "Poodle" protection New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Disable TLS 1.0 for client and server SCHANNEL communications New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server' -name 'Enabled' -value '0' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client' -name 'Enabled' -value '0' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Add and Disable TLS 1.1 for client and server SCHANNEL communications New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server' -name 'Enabled' -value '0' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client' -name 'Enabled' -value '0' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client' -name 'DisabledByDefault' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Add and Enable TLS 1.2 for client and server SCHANNEL communications New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client' -name 'DisabledByDefault' -value 0 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline Write-Host ' Completed!' Write-Host 'Configuring Ciphers.' -NoNewline # Re-create the ciphers key. New-Item 'HKLM:SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers' -Force | Out-Null Write-Host '.' -NoNewline # Disable insecure/weak ciphers. $insecureCiphers = @( 'DES 56/56', 'NULL', 'RC2 128/128', 'RC2 40/128', 'RC2 56/128', 'RC4 40/128', 'RC4 56/128', 'RC4 64/128', 'RC4 128/128', 'Triple DES 168' ) Foreach ($insecureCipher in $insecureCiphers) { $key = (Get-Item HKLM:\).OpenSubKey('SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers', $true).CreateSubKey($insecureCipher) $key.SetValue('Enabled', 0, 'DWord') $key.close() Write-Host '.' -NoNewline } # Enable new secure ciphers. # - RC4: It is recommended to disable RC4, but you may lock out WinXP/IE8 if you enforce this. This is a requirement for FIPS 140-2. # - 3DES: It is recommended to disable these in near future. This is the last cipher supported by Windows XP. # - Windows Vista and before 'Triple DES 168' was named 'Triple DES 168/168' per https://support.microsoft.com/en-us/kb/245030 $secureCiphers = @( 'AES 128/128', 'AES 256/256' ) Foreach ($secureCipher in $secureCiphers) { $key = (Get-Item HKLM:\).OpenSubKey('SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers', $true).CreateSubKey($secureCipher) New-ItemProperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\$secureCipher" -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force | Out-Null $key.close() Write-Host '.' -NoNewline } Write-Host ' Completed!' Write-Host 'Configuring Hashes.' -NoNewline # Set hashes configuration. New-Item 'HKLM:SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Hashes' -Force | Out-Null New-Item 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Hashes\MD5' -Force | Out-Null New-ItemProperty -path 'HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Hashes\MD5' -name Enabled -value 0 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline $secureHashes = @( 'SHA', 'SHA256', 'SHA384', 'SHA512' ) Foreach ($secureHash in $secureHashes) { $key = (Get-Item HKLM:\).OpenSubKey('SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Hashes', $true).CreateSubKey($secureHash) New-ItemProperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Hashes\$secureHash" -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force | Out-Null $key.close() Write-Host '.' -NoNewline } # Set KeyExchangeAlgorithms configuration. New-Item 'HKLM:SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms' -Force | Out-Null $secureKeyExchangeAlgorithms = @( 'Diffie-Hellman', 'ECDH', 'PKCS' ) Foreach ($secureKeyExchangeAlgorithm in $secureKeyExchangeAlgorithms) { $key = (Get-Item HKLM:\).OpenSubKey('SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms', $true).CreateSubKey($secureKeyExchangeAlgorithm) New-ItemProperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\$secureKeyExchangeAlgorithm" -name 'Enabled' -value '0xffffffff' -PropertyType 'DWord' -Force | Out-Null $key.close() Write-Host '.' -NoNewline } Write-Host ' Completed!' # Microsoft Security Advisory 3174644 - Updated Support for Diffie-Hellman Key Exchange # https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2016/3174644 Write-Host 'Configure longer DHE key shares for TLS servers.' -NoNewline New-ItemProperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman" -name 'ServerMinKeyBitLength' -value '2048' -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\Diffie-Hellman" -name 'ClientMinKeyBitLength' -value '2048' -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # https://support.microsoft.com/en-us/help/3174644/microsoft-security-advisory-updated-support-for-diffie-hellman-key-exc New-ItemProperty -path "HKLM:\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\PKCS" -name 'ClientMinKeyBitLength' -value '2048' -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline # Set cipher suites order as secure as possible (Enables Perfect Forward Secrecy). $os = Get-WmiObject -class Win32_OperatingSystem if ([System.Version]$os.Version -lt [System.Version]'10.0') { Write-Host '.' -NoNewline $cipherSuitesOrder = @( 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P521', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P521', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P384', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P521', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P384', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA_P256', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P521', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P384', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA_P256', 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P521', 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P521', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256_P256', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P521', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P521', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256_P256', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P521', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P384', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA_P256', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P521', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P384', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA_P256', # Below are the only AEAD ciphers available on Windows 2012R2 and earlier. # - RSA certificates need below ciphers, but ECDSA certificates (EV) may not. # - We get penalty for not using AEAD suites with RSA certificates. 'TLS_RSA_WITH_AES_256_GCM_SHA384', 'TLS_RSA_WITH_AES_128_GCM_SHA256', 'TLS_RSA_WITH_AES_256_CBC_SHA256', 'TLS_RSA_WITH_AES_128_CBC_SHA256', 'TLS_RSA_WITH_AES_256_CBC_SHA', 'TLS_RSA_WITH_AES_128_CBC_SHA' ) } else { Write-Host '.' -NoNewline $cipherSuitesOrder = @( 'TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384', 'TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256', 'TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA', 'TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA', 'TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384', 'TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256', 'TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA', 'TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA' ) } $cipherSuitesAsString = [string]::join(',', $cipherSuitesOrder) # One user reported this key does not exists on Windows 2012R2. Cannot repro myself on a brand new Windows 2012R2 core machine. Adding this just to be save. New-Item 'HKLM:\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002' -ErrorAction SilentlyContinue New-ItemProperty -path 'HKLM:\SOFTWARE\Policies\Microsoft\Cryptography\Configuration\SSL\00010002' -name 'Functions' -value $cipherSuitesAsString -PropertyType 'String' -Force | Out-Null Write-Host '.' -NoNewline Write-Host ' Completed!' # Exchange Server TLS guidance Part 2: Enabling TLS 1.2 and Identifying Clients Not Using It # https://blogs.technet.microsoft.com/exchange/2018/04/02/exchange-server-tls-guidance-part-2-enabling-tls-1-2-and-identifying-clients-not-using-it/ # New IIS functionality to help identify weak TLS usage # https://cloudblogs.microsoft.com/microsoftsecure/2017/09/07/new-iis-functionality-to-help-identify-weak-tls-usage/ Write-Host 'Enable TLS 1.2 for .NET 3.5 and .NET 4.x' -NoNewline New-ItemProperty -path "HKLM:\SOFTWARE\Microsoft\.NETFramework\v2.0.50727" -name 'SystemDefaultTlsVersions' -value 1 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SOFTWARE\Microsoft\.NETFramework\v2.0.50727" -name 'SchUseStrongCrypto' -value 1 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319" -name 'SystemDefaultTlsVersions' -value 1 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SOFTWARE\Microsoft\.NETFramework\v4.0.30319" -name 'SchUseStrongCrypto' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline if (Test-Path 'HKLM:\SOFTWARE\Wow6432Node') { New-ItemProperty -path "HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727" -name 'SystemDefaultTlsVersions' -value 1 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727" -name 'SchUseStrongCrypto' -value 1 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319" -name 'SystemDefaultTlsVersions' -value 1 -PropertyType 'DWord' -Force | Out-Null New-ItemProperty -path "HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319" -name 'SchUseStrongCrypto' -value 1 -PropertyType 'DWord' -Force | Out-Null Write-Host '.' -NoNewline } # DefaultSecureProtocols Value Decimal value Protocol enabled # 0x00000008 8 Enable SSL 2.0 by default # 0x00000020 32 Enable SSL 3.0 by default # 0x00000080 128 Enable TLS 1.0 by default # 0x00000200 512 Enable TLS 1.1 by default # 0x00000800 2048 Enable TLS 1.2 by default $defaultSecureProtocols = @( '2048' # TLS 1.2 ) $defaultSecureProtocolsSum = ($defaultSecureProtocols | Measure-Object -Sum).Sum Write-Host ' Completed!' # Update to enable TLS 1.2 as a default secure protocols in WinHTTP in Windows # https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in Write-Host 'Verifying...' # Verify if hotfix KB3140245 is installed. $file_version_winhttp_dll = (Get-Item $env:windir\System32\winhttp.dll).VersionInfo | % {("{0}.{1}.{2}.{3}" -f $_.ProductMajorPart,$_.ProductMinorPart,$_.ProductBuildPart,$_.ProductPrivatePart)} $file_version_webio_dll = (Get-Item $env:windir\System32\Webio.dll).VersionInfo | % {("{0}.{1}.{2}.{3}" -f $_.ProductMajorPart,$_.ProductMinorPart,$_.ProductBuildPart,$_.ProductPrivatePart)} if ([System.Version]$file_version_winhttp_dll -lt [System.Version]"6.1.7601.23375" -or [System.Version]$file_version_webio_dll -lt [System.Version]"6.1.7601.23375") { Write-Host 'WinHTTP: Cannot enable TLS 1.2. Please see https://support.microsoft.com/en-us/help/3140245/update-to-enable-tls-1-1-and-tls-1-2-as-a-default-secure-protocols-in for system requirements.' } else { Write-Host 'WinHTTP: Minimum system requirements are met.' Write-Host 'WinHTTP: Activate TLS 1.2 only.' New-ItemProperty -path 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp' -name 'DefaultSecureProtocols' -value $defaultSecureProtocolsSum -PropertyType 'DWord' -Force | Out-Null if (Test-Path 'HKLM:\SOFTWARE\Wow6432Node') { # WinHttp key seems missing in Windows 2019 for unknown reasons. New-Item 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp' -ErrorAction SilentlyContinue | Out-Null New-ItemProperty -path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp' -name 'DefaultSecureProtocols' -value $defaultSecureProtocolsSum -PropertyType 'DWord' -Force | Out-Null } } #Write-Host -ForegroundColor Red 'A computer restart is required to apply settings. Restart computer now?' #Restart-Computer -Force -Confirm } remove-pssession $session write-host "Computer: $($_.computer) finsished" }