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The F5 BIG-IP appliance must authenticate Network Time Protocol (NTP) sources using authentication that is cryptographically based.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-266086F5BI-DM-300048SV-266086r1024925_ruleCCI-001967medium
Description
If NTP is not authenticated, an attacker can introduce a rogue NTP server. This rogue server can then be used to send incorrect time information to network devices, which will make log timestamps inaccurate and affect scheduled actions. NTP authentication is used to prevent this tampering by authenticating the time source.
STIGDate
F5 BIG-IP TMOS NDM Security Technical Implementation Guide2025-06-12

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-04Identification & Authentication for Devices
0.50
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (49) 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-17(10)Authenticate Remote Commands
1.00
AC-17(2)Protection of Confidentiality and Integrity Using Encryption
1.00
AC-18(1)Authentication and Encryption
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-4(17)Domain Authentication
1.00
AC-7Unsuccessful Logon Attempts
1.00
AU-8Time Stamps
1.00

+39 more (top 10 by confidence shown)

CCI1 mapping
CCI-001967
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 4 hops (3) 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.

PR.AA-01
0.50
PR.AA-03
0.50
PR.AA-05
0.50

Details

Check Text (C-266086r1024925_chk)

From the BIG-IP Console: cat /etc/ntp/keys #Verify this key is installed on all the NTP servers and clients participating in the NTP time synchronization. tmsh list sys ntp include #Verify there is a line similar to the following: #server <ntp server> key <trusted key number matched to /etc/ntp/keys> iburst trustedkey <trusted key number matched to /etc/ntp/keys> If the BIG-IP appliance is not configured to authenticate Network Time Protocol sources using authentication that is cryptographically based, this is a finding.

Fix Text (F-69912r1024925_fix)

From the BIG-IP console, type the following commands: echo "1 M <passphrase> #MD5 Key" > /etc/ntp/keys Note: This command assumes that no other keys have been previously configured in the /etc/ntp/keys file. Running this command will overwrite the file. #Make sure this key is installed on all the NTP servers and clients participating in the NTP time synchronization. tmsh edit sys ntp all-properties #Replace the "include" section with the following (add as many ntp server lines as necessary for the environment, but configure at least 2): include "server <ntp server> key <trusted key number matched to /etc/ntp/keys> iburst trustedkey <trusted key number matched to /etc/ntp/keys> server <ntp server> key <trusted key number matched to /etc/ntp/keys> iburst trustedkey <trusted key number matched to /etc/ntp/keys>" tmsh save sys config