CVE-2021-28211 Memory corruption in EDK II

Medium 6.7 Published 11 Jun 2021 Updated 3 Aug 2024

A heap overflow in EDK II allows attackers to execute arbitrary code or escalate privileges during firmware decompression.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2021-28211?

CVE-2021-28211 is a medium-severity memory corruption vulnerability in TianoCore EDK II, published on 11 Jun 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2021-28211?

It affects 1 product.

Linux distribution packages (4)

`edk2` Red Hat:enterprise_linux:8::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.1`
`edk2-aarch64` Red Hat:enterprise_linux:8::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.1`
`edk2-ovmf` Red Hat:enterprise_linux:8::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.1`
`edk2` Rocky Linux:8	All versions	`0:20200602gitca407c7246bf-4.el8_4.1`

Products include Tianocore Edk2.

How do I fix CVE-2021-28211?

Apply the vendor's patch.

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

Is CVE-2021-28211 being exploited?

There is no known exploitation of CVE-2021-28211 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2021-28211, GHSA-9f7r-6p3j-j5wj, OESA-2021-1338, RHSA-2021:2591, RLSA-2021:2591, UBUNTU-CVE-2021-28211.