USN-4923-1: EDK II vulnerabilities

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS

Packages

• 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

• 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

• CVE-2021-28211
• CVE-2021-28210

Related notices

• USN-7060-1: edk2, qemu-efi-aarch64, ovmf, ovmf-ia32, qemu-efi-arm, qemu-efi