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Nutanix OS must set the value of "lock-after-time" to 890 seconds for remote access sessions.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-279529NXAC-OS-000003SV-279529r1192546_ruleCCI-000057medium
Description
A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems must be able to identify when a user's session is idle and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled. Satisfies: SRG-OS-000029-GPOS-00010, SRG-OS-000031-GPOS-00012, SRG-OS-000030-GPOS-00011, SRG-OS-000028-GPOS-00009
STIGDate
Nutanix Acropolis GPOS Security Technical Implementation Guide2026-02-24

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.

IAC-24Session Lock
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (18) 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
AU-10Non-repudiation
1.00
CM-7Least Functionality
1.00
IA-11Re-authentication
1.00
IA-2Identification and Authentication (Organizational Users)
1.00
IA-2(1)Multi-factor Authentication to Privileged Accounts
1.00
IA-2(12)Acceptance of PIV Credentials
1.00

+8 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.

3.1.10
1.00
CCI1 mapping
CCI-000057
1.00

Details

Check Text (C-279529r1192546_chk)

Verify Nutanix TMUX shell is enabled, which sets the user session lock for the Admin account of last resort. 1. For AOS, Prism Central, and Files, log in to the CVM as the Admin user. 2. For AHV, verify the value of "locl-after-time" is set to "890" using the following command. $ sudo grep -i "lock-after-time" /etc/tmux.conf set -g lock-after-time 890 If the Nutanix TMUX shell is not enabled or if "lock-after-time" is not configured, this is a finding.

Fix Text (F-83987r1192545_fix)

1. For AOS, Prism Central, and Files, log in as Admin and run the following command to set the Nutanix TMUX and configure options for the Admin account of last resort. $ configure_dod_mode.sh enter_dod_mode 2. For AHV, this is set by default in the OS. The value of "lock-after-time" is set to "890" by the vendor and must not be altered by customers. If the value is not set to the default, this is an unauthorized modification which may indicate the security settings for the build has been modified. Rebuild the system from source to correct this issue.