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XCCDF
Guide to the Secure Configuration of Red Hat Enterprise Linux 8
Services
SSH Server
Configure OpenSSH Server if Necessary
Set SSH Client Alive Count Max to zero
Set SSH Client Alive Count Max to zero
An XCCDF Rule
Details
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Set SSH Client Alive Count Max to zero
Medium Severity
The SSH server sends at most
ClientAliveCountMax
messages during a SSH session and waits for a response from the SSH client. The option
ClientAliveInterval
configures timeout after each
ClientAliveCountMax
message. If the SSH server does not receive a response from the client, then the connection is considered unresponsive and terminated. To ensure the SSH timeout occurs precisely when the
ClientAliveInterval
is set, set the
ClientAliveCountMax
to value of
0
in
/etc/ssh/sshd_config
: