=========================================================================Ubuntu Security Notice USN-2836-1
December 15, 2015

grub2 vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

GRUB password protection can be bypassed.

Software Description:
- grub2: GRand Unified Bootloader

Details:

Hector Marco and Ismael Ripoll discovered that GRUB incorrectly handled
the backspace key when configured to use authentication. A local attacker
could use this issue to bypass GRUB password protection.

Update instructions:

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

Ubuntu 15.10:
  grub2-common                    2.02~beta2-29ubuntu0.2

Ubuntu 15.04:
  grub2-common                    2.02~beta2-22ubuntu1.4

Ubuntu 14.04 LTS:
  grub2-common                    2.02~beta2-9ubuntu1.6

Ubuntu 12.04 LTS:
  grub2-common                    1.99-21ubuntu3.19

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-2836-1
  CVE-2015-8370

Package Information:
  https://launchpad.net/ubuntu/+source/grub2/2.02~beta2-29ubuntu0.2
  https://launchpad.net/ubuntu/+source/grub2/2.02~beta2-22ubuntu1.4
  https://launchpad.net/ubuntu/+source/grub2/2.02~beta2-9ubuntu1.6
  https://launchpad.net/ubuntu/+source/grub2/1.99-21ubuntu3.19