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en:it-security:smb-hardening [2023/11/13 13:53] – created psycoreen:it-security:smb-hardening [2024/02/05 07:34] (current) – old revision restored (2024/02/04 23:30) psycore
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 +{{tag>english startpage it-security windows active-directory}}
 ====== SMB Hardening ====== ====== SMB Hardening ======
  
 ===== Technical background to the SMB protocol ===== ===== Technical background to the SMB protocol =====
  
-[[wpde>Server Message Block]] is susceptible to NTLM relay attacks if packets are not signed. This [[it-security:glossary:m:man-in-the-middle|man-in-the-middle attack]] hijacks authentications between clients and servers. Authentication can be used to start a session on the server and steal data.+[[wpde>Server Message Block]] is susceptible to NTLM relay attacks if packets are not signed. This [[wpde>Man-in-the-Middle-Angriff|man-in-the-middle attack]] hijacks authentications between clients and servers. Authentication can be used to start a session on the server and steal data.
 The SMB signing explicitly assigns each initiated session to the client. This means that it is still possible to hijack the authentication, but it is discarded as the session is not signed. The SMB signing explicitly assigns each initiated session to the client. This means that it is still possible to hijack the authentication, but it is discarded as the session is not signed.
  
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 ===== Procedure ===== ===== Procedure =====
  
-  * Step 1 - Deactivate SMBv1 +<mermaid> 
-  * Step 2 - Optionally enable SMB signing on the client side +  flowchart 
-  * Step 3 - Force SMB signing on the server side+      Z[Flow] 
 +      A[Disable SMBv1] 
 +      B[SMB signing] 
 +      C(Client) 
 +      D(Server) 
 +      E(optional activation) 
 +      F(forced activation) 
 +      Z--Step 1-->A 
 +      Z-->B 
 +      B-->C 
 +      B-->D 
 +      C--Step 2-->E 
 +      D--Step 3-->F 
 +</mermaid>
  
 ==== Step 1 - Deactivate SMBv1 ==== ==== Step 1 - Deactivate SMBv1 ====