![]() We believe this so strongly that when we introduced Scaleout File Server, we explicitly prevented SMB1 access to those shares!Īs an owner of SMB at MS, I cannot emphasize enough how much I want everyone to stop using SMB1 Your client will happily derp away on SMB1 and share all its darkest secrets unless you required encryption on that share to prevent SMB1 in the first place. All they need to do is block SMB2+ on themselves and answer to your server’s name or IP. The nasty bit is that no matter how you secure all these things, if your clients use SMB1, then a man-in-the-middle can tell your client to ignore all the above. Signing performance increases in SMB2 and 3. HMAC SHA-256 replaces MD5 as the hashing algorithm in SMB 2.02, SMB 2.1 and AES-CMAC replaces that in SMB 3.0+. Insecure guest auth blocking (SMB 3.0+ on Windows 10+).In SMB 3.1.1 encryption performance is even better than signing! Prevents inspection of data on the wire, MiTM attacks. Protects against security downgrade attacks. Secure Dialect Negotiation (SMB 3.0, 3.02).Pre-authentication Integrity (SMB 3.1.1+).When you use SMB1, you lose key protections offered by later SMB protocol versions: Otherwise, let me explain why this protocol needs to hit the landfill. SMB1 is being removed from Windows and Windows Server.If you don't care about the why and just want to get to the how, I recommend you review: I blame the West Coast hippy lifestyle :). Frankly, its naivete is staggering when viewed though modern eyes. A world without malicious actors, without vast sets of important data, without near-universal computer usage. ![]() The original SMB1 protocol is nearly 30 years old, and like much of the software made in the 80’s, it was designed for a world that no longer exists. If you need this security patch, you already have a much bigger problem: you are still running SMB1. In September of 2016, MS16-114, a security update that prevents denial of service and remote code execution. Hi folks, Ned here again and today’s topic is short and sweet: First published on TECHNET on Sep 16, 2016
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