USN-4684-1: EDK II vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

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)

Update instructions

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

Ubuntu 20.10

• 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

Ubuntu 20.04

• 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

Ubuntu 18.04

• 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

Ubuntu 16.04

• ovmf - 0~20160408.ffea0a2c-2ubuntu0.2
• qemu-efi - 0~20160408.ffea0a2c-2ubuntu0.2

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

References

• CVE-2019-14584
• CVE-2019-14562