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Ubuntu Security Notice USN-5088-1
September 23, 2021

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

- Ubuntu 21.04
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in EDK II.

Software Description:
- edk2: UEFI firmware for virtual machines

Details:

It was discovered that EDK II incorrectly handled input validation in
MdeModulePkg. A local user could possibly use this issue to cause EDK II to
crash, resulting in a denial of service, obtain sensitive information or
execute arbitrary code. (CVE-2019-11098)

Paul Kehrer discovered that OpenSSL used in EDK II incorrectly handled
certain input lengths in EVP functions. An attacker could possibly use this
issue to cause EDK II to crash, resulting in a denial of service.
(CVE-2021-23840)

Ingo Schwarze discovered that OpenSSL used in EDK II incorrectly handled
certain ASN.1 strings. An attacker could use this issue to cause EDK II to
crash, resulting in a denial of service, or possibly obtain sensitive
information. (CVE-2021-3712)

It was discovered that EDK II incorrectly decoded certain strings. 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-2021-38575)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.04:
  ovmf                            2020.11-4ubuntu0.1
  ovmf-ia32                       2020.11-4ubuntu0.1
  qemu-efi                        2020.11-4ubuntu0.1
  qemu-efi-aarch64                2020.11-4ubuntu0.1
  qemu-efi-arm                    2020.11-4ubuntu0.1

Ubuntu 20.04 LTS:
  ovmf                            0~20191122.bd85bf54-2ubuntu3.3
  qemu-efi                        0~20191122.bd85bf54-2ubuntu3.3
  qemu-efi-aarch64                0~20191122.bd85bf54-2ubuntu3.3
  qemu-efi-arm                    0~20191122.bd85bf54-2ubuntu3.3

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-5088-1
  CVE-2019-11098, CVE-2021-23840, CVE-2021-3712, CVE-2021-38575

Package Information:
  https://launchpad.net/ubuntu/+source/edk2/2020.11-4ubuntu0.1
  https://launchpad.net/ubuntu/+source/edk2/0~20191122.bd85bf54-2ubuntu3.3