Security Misconfiguration
SMB Signing Not Required – Linux
TCM-KB-INT-002
Last Updated: 6/23/2023
Linux Operating Systems
The recommended remediation steps and configurations described in this response would primarily affect endpoint systems running the Linux Operating System.
SMB
SMB refers to Server Message Block.
A small message block refers to a compact unit of data transmission used in communication protocols. It typically contains a limited amount of information, such as a command, status update, or a small portion of a larger message, allowing for efficient and rapid exchange of data between devices or systems.
Contributor
Joe Helle
Chief Hacking Officer
This Knowledge Base Article was submitted by: Joe Helle.
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Security Misconfiguration
Issue
SMB signing is not required in the SMB share hosted on a Linux endpoint.
Recommended Remediation
The following outlines the recommended steps that the systems and network administrators should take in order to secure the environment.
Access the Linux endpoint with either the root user account, or a user account that has sudo privileges. Utilizing a text editor tool such as Nano or Vim, add the following lines underneath the [global] tag at the top of the file.
server signing = mandatory
client signing = mandatory
It is necessary to restart the Samba service. Execute the following command with sudo or root privileges:
systemctl restart smbd.service
Check the change was made by running Nmap against the endpoint and reviewing the results.
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