Detections
Analytics
CASA-ND-000470 - The Cisco ASA must be configured to implement replay-resistant authentication mechanisms for network access to privileged accounts.
Information
A replay attack may enable an unauthorized user to gain access to the application. Authentication sessions between the authenticator and the application validating the user credentials must not be vulnerable to a replay attack.An authentication process resists replay attacks if it is impractical to achieve a successful authentication by recording and replaying a previous authentication message.
Techniques used to address this include protocols using nonces (e.g., numbers generated for a specific one-time use) or challenges (e.g., TLS, WS_Security). Additional techniques include time-synchronous or challenge-response one-time authenticators.
Solution
Step 1: Enable FIPS mode via the fips enable command.Step 2: Configure SSH to only use FIPS-compliant ciphers and Diffie-Hellman Group 14 for the key exchange.
ASA(config)# ssh cipher encryption fips
ASA(config)# ssh key-exchange group dh-group14-sha
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_ASA_Y26M01_STIG.zip
Item Details
Audit Name: DISA STIG Cisco ASA NDM v2r4
Category: IDENTIFICATION AND AUTHENTICATION
References: 800-53|IA-2(8), CAT|II, CCI|CCI-001941, Rule-ID|SV-239913r960993_rule, STIG-ID|CASA-ND-000470, Vuln-ID|V-239913
Plugin: Cisco
Control ID: 86b83782ae3ad75adfdf15d6f311360fa81ffb15740637e94216f63aa74fd2db