Trusted Firmware-M (TF-M) 1.4.0, when Profile Small is used, has incorrect access control. NSPE can access a secure key (held by the Crypto service) based solely on knowledge of its key ID. For example, there is no authorization check associated with the relationship between a caller and a key owner.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-40327
• https://developer.arm.com/support/arm-security-updates
• https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/
• https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.html