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             AUSCERT External Security Bulletin Redistribution

                    USN-4684-1: EDK II vulnerabilities
                              8 January 2021


        AusCERT Security Bulletin Summary

Product:           EDK II
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-14584 CVE-2019-14562 

Reference:         ESB-2020.4500

Original Bulletin: 

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USN-4684-1: EDK II vulnerabilities
07 January 2021

Several security issues were fixed in EDK II.

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS


  o edk2 - UEFI firmware for virtual machines


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.

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

Ubuntu 20.10

  o ovmf - 2020.05-5ubuntu0.1
  o qemu-efi - 2020.05-5ubuntu0.1
  o qemu-efi-aarch64 - 2020.05-5ubuntu0.1
  o qemu-efi-arm - 2020.05-5ubuntu0.1

Ubuntu 20.04

  o ovmf - 0~20191122.bd85bf54-2ubuntu3.1
  o qemu-efi - 0~20191122.bd85bf54-2ubuntu3.1
  o qemu-efi-aarch64 - 0~20191122.bd85bf54-2ubuntu3.1
  o qemu-efi-arm - 0~20191122.bd85bf54-2ubuntu3.1

Ubuntu 18.04

  o ovmf - 0~20180205.c0d9813c-2ubuntu0.3
  o qemu-efi - 0~20180205.c0d9813c-2ubuntu0.3
  o qemu-efi-aarch64 - 0~20180205.c0d9813c-2ubuntu0.3
  o qemu-efi-arm - 0~20180205.c0d9813c-2ubuntu0.3

Ubuntu 16.04

  o ovmf - 0~20160408.ffea0a2c-2ubuntu0.2
  o 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.


  o CVE-2019-14584
  o CVE-2019-14562

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