A TPM Endorsement Key mismatch occurs when the EK stored in the TPM does not match the one stored in the database (DB). Several factors can contribute to this discrepancy:
This can happen after a hardware repair, TPM reset, or operating system reinstall. A TPM Endorsement Key mismatch occurs when the
to ensure no VMs are affected. Disconnect the host from the vCenter inventory. Remove the host from the inventory entirely. Disconnect the host from the vCenter inventory
In a secure provisioning workflow, a management server or database (db) records the public portion of the EK ($EK_{pub}$) when a host is first registered. When the host attempts to re-attest or provision new certificates, the server compares the presented EK against the stored record. If the server returns an error stating the keys do not match, it indicates a fundamental discrepancy between the expected identity and the physical hardware presenting itself. When the host attempts to re-attest or provision
To minimize the likelihood of TPM Endorsement Key mismatches:
Trusted Platform Module (TPM) technology serves as the cornerstone of modern hardware-based security, providing a hardware root of trust for platform integrity. A critical failure point in TPM-based architectures, particularly during attestation or provisioning, is the error: "The new host TPM endorsement key doesn't match the one stored in the db." This paper explores the technical underpinnings of the Endorsement Key (EK), the logic behind database matching, the common scenarios leading to mismatch errors, and the security implications of resolving them. We distinguish between legitimate lifecycle events (such as TPM replacement) and potential security threats (such as spoofing), offering best practices for administrators handling this exception.