The F5 BIG-IP appliance IPsec VPN must be configured to use FIPS-validated SHA-2 or higher for Internet Key Exchange (IKE).
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-266287 | F5BI-VN-300041 | SV-266287r1024762_rule | High |
| Description |
| Without cryptographic integrity protections, information can be altered by unauthorized users without detection. Although allowed by SP800-131Ar2 for some applications, SHA-1 is considered a compromised hashing standard and is being phased out of use by industry and government standards. Unless required for legacy use, DOD systems must not be configured to use SHA-2 for integrity of remote access sessions. This requirement is applicable to the configuration of IKE Phase 1 and Phase 2. |
| STIG | Date |
| F5 BIG-IP TMOS VPN Security Technical Implementation Guide | 2024-09-09 |
Details
| Check Text (C-70211r1024107_chk) |
| From the BIG-IP GUI: 1. Network. 2. IPsec. 3. IKE Peers. 4. Click on the name of the IKE peer. 5. Verify "SHA-1" or "MD5" is not selected for the following: IKE Phase 1 Algorithms >> Authentication Algorithm IKE Phase 1 Algorithms >> Pseudo-Random Function From the BIG-IP GUI: 1. Network. 2. IPsec. 3. IPsec Policies. 4. Click the name of the IPsec Policy. 5. Verify "SHA-1" is not selected for the following: IKE Phase 2 >> Authentication Algorithm If the BIG-IP appliance is not configured to use FIPS-validated SHA-2 or higher for IKE, this is a finding. |
| Fix Text (F-70114r1024108_fix) |
| From the BIG-IP GUI: 1. Network. 2. IPsec. 3. IKE Peers. 4. Click on the name of the IKE peer. 5. Configure SHA-2 or higher for the following: IKE Phase 1 Algorithms >> Authentication Algorithm IKE Phase 1 Algorithms >> Pseudo-Random Function 6. Click "Update". From the BIG-IP GUI: 1. Network. 2. IPsec. 3. IPsec Policies. 4. Click the name of the IPsec Policy. 5. Configure SHA-2 or higher for the following: IKE Phase 2 >> Authentication Algorithm 6. Click "Update". |