Title

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. (Cat II impact)

Discussion

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.

Check Content

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.

Fix Text

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.

Additional Identifiers

Rule ID: SV-239977r666337_rule

Vulnerability ID: V-239977

Group Title: SRG-NET-000234-VPN-000810

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.