Exploit/Advisories

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Ubuntu Security Notice USN-4923-1
April 20, 2021

edk2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in EDK II.

Software Description:
- 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:
ovmf 2020.05-5ubuntu0.2
qemu-efi 2020.05-5ubuntu0.2
qemu-efi-aarch64 2020.05-5ubuntu0.2
qemu-efi-arm 2020.05-5ubuntu0.2

Ubuntu 20.04 LTS:
ovmf 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi-aarch64 0~20191122.bd85bf54-2ubuntu3.2
qemu-efi-arm 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:
https://ubuntu.com/security/notices/USN-4923-1
CVE-2021-28210, CVE-2021-28211

Package Information:
https://launchpad.net/ubuntu/+source/edk2/2020.05-5ubuntu0.2
https://launchpad.net/ubuntu/+source/edk2/0~20191122.bd85bf54-2ubuntu3.2

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