CVE-2021-40327 Missing authorization in n/a

Medium 5.9 Published 13 Jan 2022 Updated 4 Aug 2024

Attackers can access secure cryptographic keys without authorization in Trusted Firmware-M when using the Profile Small configuration.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-40327?

CVE-2021-40327 is a medium-severity missing authorization vulnerability in n/a, published on 13 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-862

Which versions are affected by CVE-2021-40327?

It affects 1 product.

Products include Trustedfirmware Trusted Firmware-M.

How do I fix CVE-2021-40327?

No fix has been published for CVE-2021-40327 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2021-40327 being exploited?

There is no known exploitation of CVE-2021-40327 in the wild and no public exploit code.

Sources

Also known as GHSA-p88f-g9m7-hv9c.