The SUSE operating system SSH daemon must be configured with a timeout interval.

From SLES 12 Security Technical Implementation Guide

Part of SRG-OS-000126-GPOS-00066

Associated with: CCI-000879 CCI-001133 CCI-002361

SV-92155r1_rule The SUSE operating system SSH daemon must be configured with a timeout interval.

Vulnerability discussion

Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. Terminating network connections associated with communications sessions includes, for example, deallocating associated TCP/IP address/port pairs at the SUSE operating system level, and deallocating networking assignments at the application level if multiple application sessions are using a single SUSE operating system-level network connection. This does not mean that the SUSE operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.Satisfies: SRG-OS-000126-GPOS-00066, SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109

Check content

Verify the SUSE operating system SSH daemon is configured to timeout idle sessions. Check that the "ClientAliveInterval" parameter is set to a value of "600" with the following command: # sudo grep -i clientalive /etc/ssh/sshd_config ClientAliveInterval 600 If "ClientAliveInterval" is not set to "600" in "/etc/ssh/sshd_config", this is a finding.

Fix text

Configure the SUSE operating system SSH daemon to timeout idle sessions. Add or modify (to match exactly) the following line in the "/etc/ssh/sshd_config" file: ClientAliveInterval 600 The SSH daemon must be restarted in order for any changes to take effect.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.

Powered by sagemincer