The SSH daemon must set a timeout interval 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-77713r1_rule The SSH daemon must set a timeout interval on idle sessions.

Vulnerability discussion

Causing idle users to be automatically logged out guards against compromises one system leading trivially to compromises on another.

Check content

To verify the ClientAliveInterval setting, run the following command: # grep -i "^ClientAliveInterval" /etc/ssh/sshd_config If there is no output or the output is not exactly "ClientAliveInterval 200", this is a finding.

Fix text

To set the ClientAliveInterval setting, add or correct the following line in "/etc/ssh/sshd_config": ClientAliveInterval 200

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