Either because it has no clue about it or because an administrator configured it to reject compression requests. ![]() No, in that case, the server ignores the request. ![]() Note that this does not mean the connection will fail if the server does not support SMB compression. Examples are when mapping a share or when using tools like Xcopy, Robocopy, or PowerShell. When the server is capable of SMB compression, it accepts the request. SMB compression allows a user or an application to request the compression of files before sending them over the wire. Considering these benefits, it is no surprise that this capability has come to SMB 3. Think about WinZip, 7-Zip, or WinRAR or backup software like Veeam Backup & Replication leveraging compression to get the job done faster and with less bandwidth or storage space needed. Using compression to save on bandwidth and storage is nothing new in this industry. While network bandwidth keeps growing, so does the amount of data and the size of files. So, its use was minimal, if used at all, bar by some technical people in the know for testing purposes.įigure 1: SMB can compress stuff transparently – Image by Loes Deventerīut despite this somewhat “exceptional” entry on the stage, it is a welcome capability to have in the toolbox for various use cases. Microsoft fixed this in an update on March 12th, 2020-KB4551762 (OS Builds 18362.73.720) ().Īt that time, SMB compression, while already in the code of specific Windows releases (Windows 10, version 1903/1909 & Windows Server version 1903/1909), was not yet widely available, let alone known. That is about a remote code execution vulnerability in how the Microsoft Server Message Block 3.1.1 (SMBv3) protocol handles specific requests. Many people got their first exposure to SMB compression through CVE-2020-0796, which is about a Windows SMBv3 Client/Server Remote Code Execution Vulnerability, which addresses this vulnerability.
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