CVE-2021-40327

Description

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.

Category

5.9
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.33%
Vendor Advisory trustedfirmware.org Vendor Advisory trustedfirmware.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://developer.arm.com/support/arm-security-updates third party advisory
https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/ patch vendor advisory
https://tf-m-user-guide.trustedfirmware.org/docs/security/security_advisories/profile_small_key_id_encoding_vulnerability.html patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-40327?
CVE-2021-40327 has been scored as a medium severity vulnerability.
How to fix CVE-2021-40327?
To fix CVE-2021-40327, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-40327 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-40327 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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