A EDK II security update has been released for Ubuntu Linux 19.10, 18.04 LTS, and 16.04 LTS.

USN-4349-1: EDK II vulnerabilities

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Ubuntu Security Notice USN-4349-1
April 30, 2020

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

- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in edk2.

Software Description:
- edk2: UEFI firmware for 64-bit x86 virtual machines

Details:

A buffer overflow was discovered in the network stack. An unprivileged user
could potentially enable escalation of privilege and/or denial of service.
This issue was already fixed in a previous release for 18.04 LTS and 19.10.
(CVE-2018-12178)

A buffer overflow was discovered in BlockIo service. An unauthenticated user
could potentially enable escalation of privilege, information disclosure and/or
denial of service. This issue was already fixed in a previous release for 18.04
LTS and 19.10. (CVE-2018-12180)

A stack overflow was discovered in bmp. An unprivileged user
could potentially enable denial of service or elevation of privilege via
local access. This issue was already fixed in a previous release for 18.04
LTS and 19.10. (CVE-2018-12181)

It was discovered that memory was not cleared before free that could lead
to potential password leak. (CVE-2019-14558)

A memory leak was discovered in ArpOnFrameRcvdDpc. An attacker could
possibly use this issue to cause a denial of service or other unspecified
impact. (CVE-2019-14559)

An integer overflow was discovered in MdeModulePkg/PiDxeS3BootScriptLib.
An attacker could possibly use this issue to cause a denial of service or
other unspecified impact. (CVE-2019-14563)

It was discovered that the affected version doesn't properly check whether an
unsigned EFI file should be allowed or not. An attacker could possibly load
unsafe content by bypassing the verification. (CVE-2019-14575)

It was discovered that original configuration runtime memory is freed, but it
is still exposed to the OS runtime. (CVE-2019-14586)

A double-unmap was discovered in TRB creation. An attacker could use it to
cause a denial of service or other unspecified impact. (CVE-2019-14587)

Update instructions:

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

Ubuntu 19.10:
ovmf 0~20190606.20d2e5a1-2ubuntu1.1
qemu-efi-aarch64 0~20190606.20d2e5a1-2ubuntu1.1
qemu-efi-arm 0~20190606.20d2e5a1-2ubuntu1.1

Ubuntu 18.04 LTS:
ovmf 0~20180205.c0d9813c-2ubuntu0.2
qemu-efi-aarch64 0~20180205.c0d9813c-2ubuntu0.2
qemu-efi-arm 0~20180205.c0d9813c-2ubuntu0.2

Ubuntu 16.04 LTS:
ovmf 0~20160408.ffea0a2c-2ubuntu0.1
qemu-efi 0~20160408.ffea0a2c-2ubuntu0.1

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://usn.ubuntu.com/4349-1
CVE-2018-12178, CVE-2018-12180, CVE-2018-12181, CVE-2019-14558,
CVE-2019-14559, CVE-2019-14563, CVE-2019-14575, CVE-2019-14586,
CVE-2019-14587

Package Information:
  https://launchpad.net/ubuntu/+source/edk2/0~20190606.20d2e5a1-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/edk2/0~20180205.c0d9813c-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/edk2/0~20160408.ffea0a2c-2ubuntu0.1