STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must securely compare internal information system clocks at least every 24 hours.

DISA Rule

SV-282549r1200627_rule

Vulnerability Number

V-282549

Group Title

SRG-OS-000298-GPOS-00116

Rule Version

TOSS-05-000202

Severity

CAT II

CCI(s)

• CCI-002322 - Provide the capability to disconnect or disable remote access to the system within the organization-defined time period.
• CCI-004923 - Compare the internal system clocks on an organization-defined frequency with organization-defined authoritative time source.
• CCI-004926 - Synchronize the internal system clocks to the authoritative time source when the time difference is greater than organization-defined time period.
• CCI-001890 - Record time stamps for audit records that use Coordinated Universal Time, have a fixed local time offset from Coordinated Universal Time, or that include the local time offset as part of the time stamp.

Weight

10

Fix Recommendation

Configure TOSS 5 to securely compare internal information system clocks at least every 24 hours with an NTP server by adding/modifying the following line in the /etc/chrony.conf file:

server [ntp.server.name] iburst maxpoll 16

Check Contents

Verify TOSS 5 is securely comparing internal information system clocks at least every 24 hours with an NTP server with the following commands:

$ sudo grep maxpoll /etc/chrony.conf

server 0.us.pool.ntp.mil iburst maxpoll 16

If the "maxpoll" option is set to a number greater than 16 or the line is commented out, this is a finding.

Verify the "chrony.conf" file is configured to an authoritative DOD time source using the following command:

$ sudo grep -i server /etc/chrony.conf
server 0.us.pool.ntp.mil

If the parameter "server" is not set or is not set to an authoritative DOD time source, this is a finding.

Vulnerability Number

V-282549

Documentable

False

Rule Version

TOSS-05-000202

Severity Override Guidance

Verify TOSS 5 is securely comparing internal information system clocks at least every 24 hours with an NTP server with the following commands:

$ sudo grep maxpoll /etc/chrony.conf

server 0.us.pool.ntp.mil iburst maxpoll 16

If the "maxpoll" option is set to a number greater than 16 or the line is commented out, this is a finding.

Verify the "chrony.conf" file is configured to an authoritative DOD time source using the following command:

$ sudo grep -i server /etc/chrony.conf
server 0.us.pool.ntp.mil

If the parameter "server" is not set or is not set to an authoritative DOD time source, this is a finding.

Check Content Reference

M

Target Key

5738