To disable 3DES on your Windows server, set the following registry key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\Triple DES 168] "Enabled"=dword:00000000 If your Windows version is anterior to Windows Vista (i.e. Weak SSL ciphers should already be disabled on Windows Server 2008 by default but you still have to disable SSL v2.0. A cipher suite specifies one algorithm for each of the following tasks: AD FS uses Schannel.dll to perform its secure communications interactions. If you allow MD5 and/or RC4, then you get the obsolete cryptography warning. The .NET Framework 3.5/4.0/4.5.x applications can switch the default protocol to TLS 1.2 by enabling the SchUseStrongCrypto registry key. In July 2016, the de facto standard for encrypting traffic on the web should be via TLS 1.2. Well, it took me some time to find the answer, but we finally figured it out – Apple ATS. The following documentation provides information on how to disable and enable certain TLS/SSL protocols and cipher suites that are used by AD FS. Microsoft Exchange 2010/2013: Do not use script versions later than v2.x. Active Directory Federation Services uses these protocols for communications. If you decide to disable HTTP/2 in IIS on Windows Server 2016 and only use HTTP/1.1, you can do so by adding two DWORD registry keys. Share. Click on the “Enabled” button to edit your server’s Cipher Suites. It all happened when I tried to harden our APIs – by disabling weak cipher suites in the TLS protocol. Use the following registry keys and their values to enable and disable SSL 3.0. You should ensure you have a full working backup of your server’s system state (which includes the registry) before making any of the following changes. After disabling them, even if an attacker is able to tamper with the negotiation, the server will refuse to use a weak cipher and abort the connection. IISCrypto can work either as a command line utility or with a UI. We found with SSL Labs documentation & from 3rd parties asking to disable below weak Ciphers. Active Directory Federation Services uses these protocols for communications. The test is simple: Get all the available cipher suites from the server, and fail the test if a weak cipher suite found (Read this OWASP guide on how to test it manually for more information). . See Enable Strong Authentication. Some of them could be cracked in minutes. The Transport Layer Security (TLS) and Secure Sockets Layer (SSL) are protocols that provide for secure communications. IIS Crypto is a free tool that gives administrators the ability to enable or disable protocols, ciphers, hashes and key exchange algorithms on Windows Server 2008, 2012, 2016 and 2019. For AD FS on Windows Server 2016 and Windows Server 2012 R2 you need to use the .NET Framework 4.0/4.5.x key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319. NMap can produce XML file with the result that is easy to process – you can use this script I wrote: It will set the exit code to 1 if NMap reports on any cipher suite with a grade less than A. 5. If you’re not sure what that means – or how it is done, stay tuned! What I was not aware of is that ATS also requires specific cipher suites (one that has PFS – perfect forward secrecy – you can find more about it here). All the tests were green, and I felt pretty safe with the deployment. I hope that you enjoy reading this post and learned something new from my mistakes. For the .NET Framework 3.5 use the following registry key: [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v2.0.50727] NMap is a free security scanner tool, that can scan the target for various security vulnerabilities, including weak cipher suites. How to Set Up An Internal SMTP Service For Windows Server; Disable weak ciphers in Apache + CentOS; Activate 2016 RDS License Server in Windows Server 2016; How to Test SMTP Services Manually in Windows Server; How to install and configure a Distributed File System (DFS) Namespace ; Have More Questions? Cumulative Update 6 for Exchange Server 2016 released; Windows Phone 8.1 will reach EOL on the 2017-07-11.NET Framework 4.7. It also does not hurt if you apply this policy settings to your Windows client computers in case any of them have IIS with digital certificate enabled. IISCrypto template optimized for windows server 2016 to enable http2 and disable blacklisted ciphersuites plus updated with newest weak ciphers disabled (this … The test is simple: Get all the available cipher suites from the server, and fail the test if a weak cipher suite found (Read, Just replace with the host that you want to check. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319 Back to the graph above. And since I did publish a security fix to disable weak cipher suites on that very day, it was very likely related to that change. To make things even weirder – this issue only presented itself in iOS logs – Android logs kept going through as usual. "SchUseStrongCrypto"=dword:00000001, Speaking in Ciphers and other Enigmatic tongues, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Client] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Client] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Server] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Server] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.1\Client] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client] "DisabledByDefault"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Server] "DisabledByDefault"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.2\Client] "DisabledByDefault"=dword:00000001, HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 128/128] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 40/128] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 56/128] "Enabled"=dword:00000001, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 128/128] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 40/128] "Enabled"=dword:00000000, [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Ciphers\RC4 56/128] "Enabled"=dword:00000000. The technical details are a bit more complicated for this discussion, and if you want to learn more – you are more than welcome to read this. The bad news – disabling weak ciphers on IIS is only possible by changing a Registry key – not so fun. This will occur if secure communication is required and they do not have a protocol to negotiate communications with. This section contains steps that tell you how to modify the registry. It’s clear that something bad happened on September 7th (notice the big orange circle – where are all the logs? XP, 2003), you will need to set the following registry key: In today's day and age, hardening your servers and removing older or weak cipher suites is becoming a major priority for many organizations. We can bundle IISCrypto with our dedicated template into a startup task, and voila – no more weak TLS ciphers suites. The Schannel SSP implementation of the TLS/SSL protocols use algorithms from a cipher suite to create keys and encrypt information. Be aware that changing the default security settings for SCHANNEL could break or prevent communications between certain clients and servers. So, what did I’ve learned from this story? SSL v2, SSL v3, TLS v1.0, TLS v1.1. After applying these changes a reboot is required. Two things we will be looking at is the use of insecure encrypted protocols and legacy cipher suites that are unfortunately still enabled on Windows Server 2019. Hi. In order to remain compliant or achieve secure ratings, removing or disabling weaker protocols or cipher suites has become a must. Let’s say an attacker is able to tamper with the cipher suites negotiation flow and force the client and server to use weak cipher suites. Improve this question. Then, this script run on the server during the provisioning process. A Startup Task is basically a batch script that you deploy with your code. Powered by WordPress & Theme by Anders Norén, Before disabling weak cipher suites, as with any other feature, I want to have a relevant test case. So ATS was the reason – but why? This is the API that’s responsible for shipping the logs from our mobile app. It also lets you reorder SSL/TLS cipher suites offered by IIS, change advanced settings, implement Best Practices with a single click, create custom templates and test your website. "SchUseStrongCrypto"=dword:00000001, For the .NET Framework 4.0/4.5.x use the following registry key: Today several versions of these protocols exist. If you are applying these changes, they must be applied to all of your AD FS servers in your farm. The only way to protect from such an issue is to disable weak cipher suites on the server side. 3DES, SSLv3, MD5, ...) suites in Java [RESOLVED] "Could not find stored procedure" after installing SfB Server … You can even create a template, by specifying which ciphers you want to disable, and saving it to a file. That’s pretty suspicious! After testing IIS Crypto 2.0 we ran into an issue with soon to be released Windows Server 2016.All of the Qualys SSL scans were not recognizing the order of the cipher suites configured by IIS Crypto. RC2 RC4 MD5 3DES DES NULL Now, after publishing the new code to production, the test from the previous section will pass. To disable SSL v2.0 (necessary for Windows Server 2003 and 2008): 1. Disabling TLS 1.0 will break the WAP to AD FS trust. It depends upon who's defintion of weak you are using. For example the POODLEattack forces the server to fall back to the flawed SSL3 protocol even that the latest TLS protocol is available. Lately there have been several attacks on encryption protocols used to encrypt communications between web browsers and web servers (https). Cloud Service is a PaaS solution, which allows you to (relatively) easily deploy your code. Setting the exit code will allow us to easily integrate it into the CI/CD pipeline, and fail the build if a weak certificate found. Required fields are marked *. Your email address will not be published. Broken) SSL v2 and v3 security protocols. Use the following registry keys and their values to enable and disable TLS 1.0. For a full list of supported Cipher suites see Cipher Suites in TLS/SSL (Schannel SSP). Contact our support instantly via Live Chat After all, that’s the best way to learn! This article informs how to explicitly allow SSH V2 only if your networking devices support that and have been configured the same and additionally on how to disable insecure ciphers when using the Solarwinds SFTP\SCP server (Free Tool) that also comes out of the box with the NCM product. ... tls cipher-selection windows-server ciphers forward-secrecy. Starting with iOS 9, Apple rolled out a new feature called ATS or App Transport Security. To install additional software on the server running your code, you can use a Startup Task. Firstly, you can’t be too careful, especially when dealing with things that you don’t fully understand. Definition of Rejected and Failed in Support Cipher Suite. Some attacks are directly against TLS but for now only some implementations of TLS are concerned. Secondly, setting strong TLS ciphers is complicated. If you ever wished to create statistics about encryption protocol versions and ciphers your clients are using, see New IIS functionality to help identify weak TLS usage how this can be logged in Windows Server 2016 and Windows Server 2012 R2 IIS logs. It was bad. There is a tool that makes it easy to define which ciphers you want to disable, and it does that for you – IISCrypto. It turns out that Microsoft quietly renamed most of their cipher suites dropping the curve (_P521, _P384, _P256) from them. To enable a cipher suite, add its string value to the Functions multi-string value key. disable weak ciphers windows server 2012 r2 February 11, 2021 Uncategorized 0 Uncategorized 0 So, I decided to run a query to show all the errors from our iOS app in the last 14 days and was amazed by the results: Before we keep investigating this bug, let’s do a quick recap of how logging works at Soluto. Effectively you only want to disable 3DES inbound, but still allow the outbound use of said cipher suite. To do this, you had to disable ATS (Careful, not a good practice to do this in production!) Using NMap is pretty straightforward: Just replace with the host that you want to check. Use the following registry keys and their values to enable and disable TLS 1.1. The Transport Layer Security (TLS) and Secure Sockets Layer (SSL) are protocols that provide for secure communications. How to protect your IIS webserver from SWEET32 bug. In 2015, you have to bump from effectively HIGH:!aNULL because modern browsers reject some of the ciphers included with HIGH. Karthik Karthik. NMap can produce XML file with the result that is easy to process – you can use, Ok, we have a failing test in our CI/CD pipeline that checks the cipher suites – let’s work on fixing it! Enabled by default and those that are used by Windows systems to perform its communications... 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By AD FS presented itself in iOS logs – Android logs kept going as... & from 3rd parties asking to disable below weak ciphers on IIS is possible!