CVE-2021-41842 Missing authorization in n/a

Critical 9.8 Published 5 Jan 2022 Updated 4 Aug 2024

Attackers can execute arbitrary code in the SMM environment due to a missing CommBuffer check in the AtaLegacySmm handler.

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-2021-41842?

CVE-2021-41842 is a critical missing authorization vulnerability in Insyde Insydeh2o, published on 5 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An issue was discovered in AtaLegacySmm in the kernel 5.0 before 05.08.46, 5.1 before 05.16.46, 5.2 before 05.26.46, 5.3 before 05.35.46, 5.4 before 05.43.46, and 5.5 before 05.51.45 in Insyde InsydeH2O. Code execution can occur because the SMI handler lacks a CommBuffer check.

Which versions are affected by CVE-2021-41842?

It affects 1 product.

Products include Insyde Insydeh2o.

How do I fix CVE-2021-41842?

No fix has been published for CVE-2021-41842 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-2021-41842 being exploited?

There is no known exploitation of CVE-2021-41842 in the wild and no public exploit code.

All Insyde Insydeh2o vulnerabilities

Sources

Also known as GHSA-v6qx-c5rh-4q6q.