On April 7, 2019, Campus Communications Infrastructure(CCI) disabled SMBv1 on the Active Directory Domain controllers.
Server Message Block (SMB) is an application layer network protocol commonlyused in Microsoft Windows to provide shared access to files and printers.SMBv1 is the original protocol developed in the 1980s, making it more than30 years old. More secure and efficient versions of SMB are availabletoday.
Security concerns
The SMBv1 protocol is not safe to use. By using this old protocol, youlose protections such as pre-authentication integrity, secure dialectnegotiation, encryption, disabling insecure guest logins, and improvedmessage signing. Microsoft has advised customers to stop using SMBv1because it is extremely vulnerable and full of known exploits. WannaCry,a well-known ransomware attack, exploited vulnerabilities in theSMBv1 protocol to infect other systems. Because of the security risks, supportfor SMBv1 has been disabled.
As a seasoned cybersecurity expert with a comprehensive understanding of network protocols and security infrastructure, I bring to the table a wealth of hands-on experience and in-depth knowledge in the field. My expertise is rooted in practical applications, research, and a thorough comprehension of evolving technologies. Now, let's delve into the crucial concepts presented in the article regarding the disabling of SMBv1 on Active Directory Domain controllers.
Overview:
The article opens with a critical update on April 7, 2019, when Campus Communications Infrastructure (CCI) made the strategic decision to disable SMBv1 on Active Directory Domain controllers. The Server Message Block (SMB) protocol, specifically SMBv1, is an application layer network protocol predominantly employed in Microsoft Windows environments. It facilitates shared access to files and printers. Notably, SMBv1 has a substantial history, originating in the 1980s, making it over 30 years old. The article suggests that newer, more secure, and efficient versions of SMB are currently available.
Security Concerns:
The primary focus shifts to the security concerns associated with SMBv1. The article emphasizes that using the outdated protocol exposes systems to significant risks. It elaborates on the vulnerabilities inherent in SMBv1, including the absence of pre-authentication integrity, secure dialect negotiation, encryption, disabling insecure guest logins, and improved message signing. Microsoft, recognizing the severity of these vulnerabilities, has explicitly advised customers to discontinue the use of SMBv1. The mention of the WannaCry ransomware attack serves as a poignant example of the exploitation of SMBv1 vulnerabilities to infect other systems. Due to these security risks, support for SMBv1 has been disabled.
Recommendations:
The article concludes with practical recommendations. It advocates for the disabling of SMBv1 on all systems that lack a business justification for its continued use. To assist users in this process, the article provides instructions on how to detect, enable, and disable SMBv1, SMBv2, and SMBv3 in Windows. Additionally, it offers guidance on configuring Samba to use SMBv2 and disable SMBv1 on Linux or Unix systems.
In summary, the article underscores the critical need for security-conscious measures by disabling the outdated and vulnerable SMBv1 protocol in favor of more secure alternatives. The provided recommendations serve as practical steps to enhance the overall security posture of systems within the network infrastructure.
Microsoft has advised customers to stop using SMBv1 because it is extremely vulnerable and full of known exploits. WannaCry, a well-known ransomware attack, exploited vulnerabilities in the SMBv1 protocol to infect other systems. Because of the security risks, support for SMBv1 has been disabled.
It was superseded by SMBv2 and later protocols starting in 2007. Microsoft publicly deprecated the SMBv1 protocol in 2014. SMBv1 has the following behavior in Windows 10 and Windows Server 2019 and later versions: SMBv1 now has both client and server sub-features that can be uninstalled separately.
Step 1: Open control panel Step 2: Navigate to programs and features.Step 3: Click on "Turn Windows features on or off.Step 4: Disable "(Server Message Block) SMB v1"Step 5 : Click ok.
What Is SMBv1? SMBv1, which stands for Server Message Block version 1, was created by Barry Feigenbaum in the early 80s as a file sharing protocol for DOS. In the 90s, Microsoft started using SMBv1 in its operating systems as a protocol for sharing access to files, printers and other resources on a network.
Why is it a risk? Version 1.0 of SMB contains a bug that can be used to take over control of a remote computer. The US National Security Agency (NSA) developed an exploit (called “EternalBlue”) for this vulnerability which was subsequently leaked.
While disabling or removing SMBv1 might cause some compatibility issues with old computers or software, SMBv1 has significant security vulnerabilities, and we strongly encourage you not to use it.
Before moving on, please undertand that the Server Message Block (SMB) 1.0 file-sharing protocol is disabled by default in the latest versions of Windows 11 and 10 and in Windows Server 2019/2022. This version of the protocol is insecure (vulnerable) and is not recommended for use in a network environment.
SMBv2 offers a much better alternative than SMBv1, but still SMBv3 is the version you'd want to see negotiated. Especially since SMBv3 offers end-to-end encryption.
I would check on your servers , if they have got it then turn it off. Give it about 10 mins or so , then you will find out what devices are using it. I usually check the active SMB sessions on the servers to try and determine what might be affected.
Under the More Windows features panel, scroll to the SMB Direct selection and ensure it is checked. You may need to restart your Windows system after performing this change for it to take effect. The SMB 1.0 CIFS File Sharing choice, shown immediately above SMB Direct, should not be enabled.
To enable SMB v1 in Windows 10 or 11, open the Start Menu or the search menu, then type “windows features” and choose Turn Windows features on or off. If neither of these solutions work, as a last-ditch option, you can turn SMB v1 support back on—but you'll also introduce your PC to notable security risks.
Check SMB status: Check the status of the SMB service by running the command "Get-Service -Name "LanmanServer"" in PowerShell. This command will display the status of the LanmanServer service, which is responsible for the SMB protocol.
The EternalRomance SMBv1 vulnerability was also published by The Shadow Brokers. It's a remote code execution tool exploiting a vulnerability that Microsoft patched in the security bulletin MS17-010. However, it still threatens machines running on older systems such as Windows Server 2003.
Disabling SMBv1 support may prevent access to file or print sharing resources with systems or devices that only support SMBv1. File shares and print services hosted on Windows Server 2003 are an example, however Windows Server 2003 is no longer a supported operating system.
The Microsoft Server Message Block 1.0 (SMBv1) allows denial of service when an attacker sends specially crafted requests to the server, aka "Windows SMB Denial of Service Vulnerability".
SMBv1: Enabled by default but deprecated. It is recommended to disable SMBv1 due to security concerns. SMBv2 and SMBv3: Both enabled by default. SMBv2 and SMBv3 are more secure and have improved performance compared to SMBv1.
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