The Cisco ASA remote access VPN server must be configured to use SHA-2 at 384 bits or greater for hashing to protect the integrity of IPsec remote access sessions.
An XCCDF Rule
Description
Without strong cryptographic integrity protections, information can be altered by unauthorized users without detection. SHA-1 is considered a compromised hashing standard and is being phased out of use by industry and Government standards. DOD systems must not be configured to use SHA-1 for integrity of remote access sessions. The remote access VPN provides access to DOD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network.
- ID
- SV-239978r916146_rule
- Version
- CASA-VN-000630
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure the ASA to use SHA-2 at 384 bits or greater for hashing to protect the integrity of IPsec remote access sessions as shown in the example below.
ASA1(config)# crypto ikev2 policy 1
ASA1(config-ikev2-policy)# integrity sha384
ASA1(config-ikev2-policy)# exit
ASA1(config)# crypto ipsec ikev2 ipsec-proposal IPSEC_TRANS