CVE-2021-3569 Memory corruption in libtpms

Medium 5.5 Published 3 Jun 2021 Updated 3 Aug 2024

A stack corruption bug in libtpms during RSA decryption causes a SIGBUS and terminates swtpm, leading to denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-3569?

CVE-2021-3569 is a medium-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 3 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A stack corruption bug was found in libtpms in versions before 0.7.2 and before 0.8.0 while decrypting data using RSA. This flaw could result in a SIGBUS (bad memory access) and termination of swtpm. The highest threat from this vulnerability is to system availability.

Weakness: CWE-787, CWE-120

Which versions are affected by CVE-2021-3569?

It affects 2 products.

Products include Libtpms Project Libtpms, Redhat Enterprise Linux.

How do I fix CVE-2021-3569?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-3569 being exploited?

There is no known exploitation of CVE-2021-3569 in the wild and no public exploit code.

All Redhat Enterprise Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2021-3569, GHSA-ppc8-jm88-74j3.