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AUSCERT External Security Bulletin Redistribution
ESB-2021.0083
USN-4684-1: EDK II vulnerabilities
8 January 2021
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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
ESB-2020.3840
Original Bulletin:
https://ubuntu.com/security/notices/USN-4684-1
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USN-4684-1: EDK II vulnerabilities
07 January 2021
Several security issues were fixed in EDK II.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o 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
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.
References
o CVE-2019-14584
o CVE-2019-14562
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