Check: RHEL-06-000071
Red Hat Enterprise Linux 6 STIG:
RHEL-06-000071
(in versions v2 r2 through v1 r26)
Title
The system must be configured so that all network connections associated with a communication session are terminated at the end of the session or after 15 minutes of inactivity from the user at a command prompt, except to fulfill documented and validated mission requirements. (Cat III impact)
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, de-allocating associated TCP/IP address/port pairs at the operating system 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 the 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-000029-GPOS-00010, SRG-OS-000163-GPOS-00072
Check Content
Verify the operating system terminates all network connections associated with a communications session at the end of the session or based on inactivity. Check the value of the system inactivity timeout with the following command: # grep -i tmout /etc/profile.d/* etc/profile.d/tmout.sh:TMOUT=900 /etc/profile.d/tmout.sh:readonly TMOUT /etc/profile.d/tmout.sh:export TMOUT If "TMOUT" is not set to "900" or less in a script located in the /etc/profile.d/ directory to enforce session termination after inactivity, this is a finding.
Fix Text
Configure the operating system to terminate all network connections associated with a communications session at the end of the session or after a period of inactivity. Create a script to enforce the inactivity timeout (for example /etc/profile.d/tmout.sh) such as: #!/bin/bash TMOUT=900 readonly TMOUT export TMOUT
Additional Identifiers
Rule ID: SV-217907r603264_rule
Vulnerability ID: V-217907
Group Title: SRG-OS-000030
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000057 |
Prevent further access to the system by initiating a device lock after organization-defined time period of inactivity; and/or requiring the user to initiate a device lock before leaving the system unattended. |
| CCI-001133 |
Terminate the network connection associated with a communications session at the end of the session or after an organization-defined time period of inactivity. |
| CCI-002361 |
Automatically terminate a user session after organization-defined conditions or trigger events requiring session disconnect. |