The Cisco ASA remote access VPN server must be configured to generate unique session identifiers using a FIPS-validated Random Number Generator (RNG) based on the Deterministic Random Bit Generators (DRBG) algorithm.

Both IPsec and TLS gateways use the RNG to strengthen the security of the protocols. Using a weak RNG will weaken the protocol and make it more vulnerable.

Use of a FIPS validated RNG that is not DRGB mitigates to a CAT III.

Review the ASA configuration to verify that FIPS mode has been enabled as shown in the example below.

ASA Version x.x ! hostname ASA1 fips enable

If the ASA is not configured to be enabled in FIPS mode, this is a finding.

Configure the ASA to have FIPS-mode enabled as shown in the example below.

ASA1(config)# fips enable ASA1(config)# end

Note: FIPS mode change will not take effect until the configuration is saved and the device rebooted.