Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2020-14308

Published: 29 July 2020

In grub2 versions before 2.06 the grub memory allocator doesn't check for possible arithmetic overflows on the requested allocation size. This leads the function to return invalid memory allocations which can be further used to cause possible integrity, confidentiality and availability impacts during the boot process.

From the Ubuntu Security Team

It was discovered that the memory allocator for GRUB2 did not validate allocation size, resulting in multiple integer overflows and heap-based buffer overflows when handling certain filesystems, PNG images or disk metadata. A local attacker could use this to execute arbitrary code and bypass UEFI Secure Boot restrictions.

Notes

AuthorNote
alexmurray
grub2-signed is not supported in Ubuntu 12.04 ESM (precise/esm) and so marking the priority for grub2 in this release as low

Priority

High

Cvss 3 Severity Score

6.4

Score breakdown

Status

Package Release Status
grub2
Launchpad, Ubuntu, Debian
bionic
Released (2.02-2ubuntu8.16)
focal
Released (2.04-1ubuntu26.1)
groovy Not vulnerable
(2.04-1ubuntu26.1)
hirsute Not vulnerable
(2.04-1ubuntu26.1)
jammy Not vulnerable
(2.06-2ubuntu7)
kinetic Not vulnerable
(2.06-2ubuntu12)
lunar Not vulnerable
(2.06-2ubuntu16)
mantic Not vulnerable
(2.06-2ubuntu18)
trusty
Released (2.02~beta2-9ubuntu1.20)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (2.02~beta2-36ubuntu3.26)
grub2-signed
Launchpad, Ubuntu, Debian
bionic
Released (1.93.18)
eoan Ignored
(end of life)
focal
Released (1.142.3)
groovy Not vulnerable
(1.147)
hirsute Not vulnerable
(1.147)
jammy Not vulnerable
(1.182~22.04.1)
kinetic Not vulnerable
(1.185)
lunar Not vulnerable
(1.192)
mantic Not vulnerable
(1.193)
trusty
Released (1.34.22)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream Needs triage

xenial
Released (1.66.26)
grub2-unsigned
Launchpad, Ubuntu, Debian
bionic
Released (2.04-1ubuntu47.4)
focal
Released (2.04-1ubuntu47.4)
jammy Not vulnerable
(2.06-2ubuntu7)
kinetic Not vulnerable
(2.06-2ubuntu12)
lunar Not vulnerable
(2.06-2ubuntu16)
mantic Not vulnerable
(2.06-2ubuntu17)
trusty Does not exist

upstream Needs triage

xenial Needed

Severity score breakdown

Parameter Value
Base score 6.4
Attack vector Local
Attack complexity High
Privileges required High
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H