==========================================================================
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:
http://www.ubuntu.com/usn/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

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