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Amazon Linux 2023 must be configured so that all network connections associated with SSH traffic are terminated after 10 minutes of becoming unresponsive.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-274050AZLX-23-001245SV-274050r1120138_ruleCCI-001133medium
Description
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, de-allocating associated TCP/IP address/port pairs at Amazon Linux 2023 level, and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that Amazon Linux 2023 terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session. Satisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109, SRG-OS-000395-GPOS-00175
STIGDate
Amazon Linux 2023 Security Technical Implementation Guide2026-02-27

Related Frameworks

1 mapping across 4 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

NET-07Network Connection Termination
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (24) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-11Device Lock
1.00
AC-11(1)Pattern-hiding Displays
1.00
AC-12Session Termination
1.00
AC-12(2)Termination Message
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(11)Usage Conditions
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-7Unsuccessful Logon Attempts
1.00

+14 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.13.9
1.00
CCI1 mapping
CCI-001133
1.00

Details

Check Text (C-274050r1120138_chk)

Verify Amazon Linux 2023 has the "ClientAliveInterval" variable set to a value of "600" or less by performing the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*clientaliveinterval' /etc/ssh/sshd_config.d/91-ClientAliveInterval.conf:ClientAliveInterval 600 If "ClientAliveInterval" does not exist, does not have a value of "600" or less in "/etc/ssh/sshd_config" or a dropfile in "/etc/ssh/sshd_config.d", or is commented out, this is a finding.

Fix Text (F-78046r1120137_fix)

Configure Amazon Linux 2023 SSH server to terminate a user session automatically after the SSH client has been unresponsive for 10 minutes. Note: This setting must be applied in conjunction with "ClientAliveCountMax 1" to function correctly. Modify or append the following lines in the "/etc/ssh/sshd_config" or a dropfile in "/etc/ssh/sshd_config.d" file: ClientAliveInterval 600 For the changes to take effect, the SSH daemon must be restarted. $ sudo systemctl restart sshd.service