Question 340
A risk review at a financial services branch focuses on preventing this issue again: A certificate renewal for the firewall's decryption trust infrastructure is completed, but endpoint trust stores still contain only the retired issuer. Which recurring control is most suitable?
Explanation
Correct Answer
Maintain planned CA renewal, client rollout and rollback procedures for decryption. This control reduces recurrence of the documented mechanism: Decryption certificate lifecycle spans firewall signing material and client-side trust distribution. It creates a repeatable check around the needed response: Coordinate overlapping trust distribution and test the new issuer before switching interception certificates.
Incorrect Answers
Track and periodically retest each decryption bypass against a named business application. That safeguard addresses another potential failure: A decryption exception is written for all finance subnets because one government portal cannot tolerate interception. It is not the most targeted recurring control for the described cause: Decryption certificate lifecycle spans firewall signing material and client-side trust distribution.
Review decryption exclusions for business owner, destination scope and expiration. That safeguard addresses another potential failure: A payment application uses certificate pinning and fails only where forward-proxy decryption is applied although the compliance design allows a narrow exception. It is not the most targeted recurring control for the described cause: Decryption certificate lifecycle spans firewall signing material and client-side trust distribution.
Include invalid-chain, expired-certificate and revoked-certificate checks in decryption testing. That safeguard addresses another potential failure: A branch TLS inspection setup accepts connections to servers with invalid certificates because the Decryption profile uses a permissive server-certificate failure action. It is not the most targeted recurring control for the described cause: Decryption certificate lifecycle spans firewall signing material and client-side trust distribution.