Cisco ASA NDM STIG Version Comparison

There are 1 differences between versions v2 r2 (Oct. 24, 2024) (the "left" version) and v2 r4 (Jan. 5, 2026) (the "right" version).

Check CASA-ND-001080 was changed between these two versions. Green, underlined text was added, red, struck-out text was removed.

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Title

The Cisco ASA must be configured to authenticate Network Time Protocol (NTP) sources using authentication with FIPS-compliant algorithms. that is cryptographically based.

Check Content

Review the Cisco ASA configuration to verify that it is compliant authenticates NTP sources using authentication with this requirement FIPS-compliant algorithms as shown in the configuration example below. ntp below: ntp authentication-key 1 md5 ***** ntp authenticate ntp trusted-key 1 ntp authentication-key 1 sha256 xxxxxx ntp server 10.1.12.2 key 1 prefer ntp server 10.1.48.10 key 1 Note: For ASAs running on Firepower Chassis hardware, the NTP settings are visible in the FXOS web UI only (not in the ASA CLI or ASDM web UI). If the Cisco ASA is not configured to authenticate NTP sources using authentication with FIPS-compliant algorithms, that is cryptographically based, this is a finding.

Discussion

If NTP Network Time Protocol 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.

Fix

Configure the Cisco ASA to authenticate NTP sources using authentication with FIPS-compliant algorithms that is cryptographically based as shown in the example below. ASA(config)# below: ASA(config)# ntp authenticate ASA(config)# ntp trusted-key 1 ASA(config)# ntp authentication-key 1 md5 sha256 xxxxxxxxxx ASA(config)# xxxxxx ASA(config)# ntp trusted-key 1 ASA(config)# ntp server 10.1.12.2 key 1 prefer ASA(config)# ntp server 10.1.48.10 key 1 ASA(config)# end