1. Ubuntu Security Notices
  2. USN-4684-1

USN-4684-1: EDK II vulnerabilities

Publication date

7 January 2021

Overview

Several security issues were fixed in EDK II.

Releases

Packages

  • edk2 - UEFI firmware for virtual machines

Details

Laszlo Ersek discovered that EDK II incorrectly validated certain signed
images. An attacker could possibly use this issue with a specially crafted
image to cause EDK II to hang, resulting in a denial of service. This issue
only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.
(CVE-2019-14562)

It was discovered that EDK II incorrectly parsed signed PKCS #7 data. An
attacker could use this issue to cause EDK II to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2019-14584)

Laszlo Ersek discovered that EDK II incorrectly validated certain signed
images. An attacker could possibly use this issue with a specially crafted
image to cause EDK II to hang, resulting in a denial of service. This issue
only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.
(CVE-2019-14562)

It was discovered that EDK II incorrectly parsed signed PKCS #7 data. An
attacker could use this issue to cause EDK II to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2019-14584)

Update instructions

After a standard system update you need to restart the virtual machines that use the affected firmware to make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
20.10 groovy ovmf –  2020.05-5ubuntu0.1
qemu-efi –  2020.05-5ubuntu0.1
qemu-efi-aarch64 –  2020.05-5ubuntu0.1
qemu-efi-arm –  2020.05-5ubuntu0.1
20.04 focal ovmf –  0~20191122.bd85bf54-2ubuntu3.1
qemu-efi –  0~20191122.bd85bf54-2ubuntu3.1
qemu-efi-aarch64 –  0~20191122.bd85bf54-2ubuntu3.1
qemu-efi-arm –  0~20191122.bd85bf54-2ubuntu3.1
18.04 bionic ovmf –  0~20180205.c0d9813c-2ubuntu0.3
qemu-efi –  0~20180205.c0d9813c-2ubuntu0.3
qemu-efi-aarch64 –  0~20180205.c0d9813c-2ubuntu0.3
qemu-efi-arm –  0~20180205.c0d9813c-2ubuntu0.3
16.04 xenial ovmf –  0~20160408.ffea0a2c-2ubuntu0.2
qemu-efi –  0~20160408.ffea0a2c-2ubuntu0.2

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References

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