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AUSCERT External Security Bulletin Redistribution
ESB-2021.1335
USN-4923-1: EDK II vulnerabilities
21 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: EDK II
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-28211 CVE-2021-28210
Reference: ESB-2021.1102
ESB-2021.1084
Original Bulletin:
https://ubuntu.com/security/notices/USN-4923-1
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USN-4923-1: EDK II vulnerabilities
20 April 2021
Several security issues were fixed in EDK II.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
Packages
o edk2 - UEFI firmware for virtual machines
Details
Laszlo Ersek discovered that EDK II incorrectly handled recursion. A
remote attacker could possibly use this issue to cause EDK II to consume
resources, leading to a denial of service. ( CVE-2021-28210 )
Satoshi Tanda discovered that EDK II incorrectly handled decompressing
certain images. A remote attacker could use this issue to cause EDK II to
crash, resulting in a denial of service, or possibly execute arbitrary
code. ( CVE-2021-28211 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o qemu-efi-arm - 2020.05-5ubuntu0.2
o qemu-efi - 2020.05-5ubuntu0.2
o qemu-efi-aarch64 - 2020.05-5ubuntu0.2
o ovmf - 2020.05-5ubuntu0.2
Ubuntu 20.04
o qemu-efi-arm - 0~20191122.bd85bf54-2ubuntu3.2
o qemu-efi - 0~20191122.bd85bf54-2ubuntu3.2
o qemu-efi-aarch64 - 0~20191122.bd85bf54-2ubuntu3.2
o ovmf - 0~20191122.bd85bf54-2ubuntu3.2
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-2021-28211
o CVE-2021-28210
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