The SSH daemon must set a timeout count on idle sessions.

From VMware vSphere ESXi 6.0 Security Technical Implementation Guide

Part of SRG-OS-000480-VMM-002000

Associated with: CCI-000366

SV-77711r1_rule The SSH daemon must set a timeout count on idle sessions.

Vulnerability discussion

This ensures a user login will be terminated as soon as the "ClientAliveCountMax" is reached.

Check content

To verify the ClientAliveCountMax setting, run the following command: # grep -i "^ClientAliveCountMax" /etc/ssh/sshd_config If there is no output or the output is not exactly "ClientAliveCountMax 3", this is a finding.

Fix text

To set the ClientAliveCountMax setting, add or correct the following line in "/etc/ssh/sshd_config": ClientAliveCountMax 3

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