![]() ![]() Of the 3 major SMB versions, SMB3 - particularly SMB 3.1.1 - offers the most security. SMB1 lacks encryption, is inefficient, and has been exploited in the wild by ransomware attacks.Ģ. For modern SMB implementations, here are some key takeaways for securing SMB:ġ. Generally speaking, SMB today is a highly secure protocol. Of course, as with most network protocols, whether or not SMB is secure depends on your version and implementation. With attacks like WannaCry and NotPetya making the news in recent years, you may wonder if SMB is secure. SMB 3.1.1 - the latest SMB protocol - was introduced with Windows 10 and Server 2016. SMB v3.02 was introduced in Windows 8.1 and Server 2012 R2. SMB v3.0) came with Windows 8 and Server 2012. SMB v3 (SMB3)- SMB3 introduced end-to-end SMB encryption and, later, the most advanced and secure implementations of SMB. ![]() SMB v2.1 was introduced with Windows 7 and Server 2008 R2, further improving performance and oplocks (opportunistic locking). For example, SMB2.0.2 introduced pre-authentication integrity and SMB2 is not vulnerable to the same WannaCry and NotPeyta exploits that make SMB1 a security risk. Additionally, SMBv2 offered security enhancements. This version of SMB had significant improvements in performance and simplicity when compared to SMB1. SMB v2 (SMB2)- SMB2 was introduced with Windows Vista. In modern applications, you should NOT use SMB v1 because it is insecure (no encryption, has been exploited in attacks like WannaCry and NotPetya) and inefficient (very “chatty” on networks creating congestion and reduced performance). In Windows 95, Microsoft introduced CIFS as a way to implement SMB1. SMB1 began in the 1980s and has gone through multiple iterations. Older SMB implementations (pre-Windows 2000) used SMB port 139. What is an SMB Port?īy default, modern implementations of SMB use TCP port 445 as the SMB port. For example, network printers are often shared using SMB. Often, an SMB share is a directory, but it can be any shared resource. What is an SMB Share?Īn SMB share, also known as an SMB file share, is simply a shared resource on an SMB server. The SMB server grants or denies SMB clients access to the shared resources (a.k.a. What is an SMB server?Īn SMB server is the network server - or cluster of servers - where SMB shares are stored. For example, within a corporate network, the user PCs that access a shared drive are SMB clients. What is an SMB client?Īn SMB client is the device that accesses resources on an SMB server. Once they access the SMB shares, clients can do things such as collaborate on files without downloading them to their machines or print using a networked printer. SMB clients connect to an SMB server using the SMB port to access SMB shares. At a high level, SMB communication is easy to understand. ![]()
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