[RHSA-2015:2623-01] Moderate: grub2 security and bug fix update

[news 28]

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Red Hat Security Advisory

 

Synopsis: Moderate: grub2 security and bug fix update

Advisory ID: RHSA-2015:2623-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2623.html

Issue date: 2015-12-15

CVE Names: CVE-2015-8370

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1. Summary:

 

Updated grub2 packages that fix one security issue and one bug are now

available for Red Hat Enterprise Linux 7.

 

Red Hat Product Security has rated this update as having Moderate security

impact. A Common Vulnerability Scoring System (CVSS) base score, which

gives a detailed severity rating, is available from the CVE link in the

References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux Client Optional (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional (v. 7) - aarch64, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

 

3. Description:

 

The grub2 packages provide version 2 of the Grand Unified Bootloader

(GRUB), a highly configurable and customizable bootloader with modular

architecture. The packages support a variety of kernel formats, file

systems, computer architectures, and hardware devices.

 

A flaw was found in the way the grub2 handled backspace characters entered

in username and password prompts. An attacker with access to the system

console could use this flaw to bypass grub2 password protection and gain

administrative access to the system. (CVE-2015-8370)

 

This update also fixes the following bug:

 

* When upgrading from Red Hat Enterprise Linux 7.1 and earlier, a

configured boot password was not correctly migrated to the newly introduced

user.cfg configuration files. This could possibly prevent system

administrators from changing grub2 configuration during system boot even if

they provided the correct password. This update corrects the password

migration script and the incorrectly generated user.cfg file. (BZ#1290089)

 

All grub2 users are advised to upgrade to these updated packages, which

contain backported patches to correct these issues.

 

4. Solution:

 

Before applying this update, make sure all previously released errata

relevant to your system have been applied.

 

For details on how to apply this update, refer to:

 

https://access.redhat.com/articles/11258

 

5. Bugs fixed (https://bugzilla.redhat.com/):

 

1286966 - CVE-2015-8370 grub2: buffer overflow when checking password entered during bootup

1290089 - Grub password broken by update from RHEL7.1 to RHEL7.2

 

6. Package List:

 

Red Hat Enterprise Linux Client (v. 7):

 

Source:

grub2-2.02-0.33.el7_2.src.rpm

 

x86_64:

grub2-2.02-0.33.el7_2.x86_64.rpm

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-2.02-0.33.el7_2.x86_64.rpm

grub2-tools-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux Client Optional (v. 7):

 

x86_64:

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-modules-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode (v. 7):

 

Source:

grub2-2.02-0.33.el7_2.src.rpm

 

x86_64:

grub2-2.02-0.33.el7_2.x86_64.rpm

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-2.02-0.33.el7_2.x86_64.rpm

grub2-tools-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

 

x86_64:

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-modules-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

grub2-2.02-0.33.el7_2.src.rpm

 

aarch64:

grub2-debuginfo-2.02-0.33.el7_2.aarch64.rpm

grub2-efi-2.02-0.33.el7_2.aarch64.rpm

grub2-tools-2.02-0.33.el7_2.aarch64.rpm

 

ppc64:

grub2-2.02-0.33.el7_2.ppc64.rpm

grub2-debuginfo-2.02-0.33.el7_2.ppc64.rpm

grub2-tools-2.02-0.33.el7_2.ppc64.rpm

 

ppc64le:

grub2-2.02-0.33.el7_2.ppc64le.rpm

grub2-debuginfo-2.02-0.33.el7_2.ppc64le.rpm

grub2-tools-2.02-0.33.el7_2.ppc64le.rpm

 

x86_64:

grub2-2.02-0.33.el7_2.x86_64.rpm

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-2.02-0.33.el7_2.x86_64.rpm

grub2-tools-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux Server Optional (v. 7):

 

aarch64:

grub2-debuginfo-2.02-0.33.el7_2.aarch64.rpm

grub2-efi-modules-2.02-0.33.el7_2.aarch64.rpm

 

x86_64:

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-modules-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 7):

 

Source:

grub2-2.02-0.33.el7_2.src.rpm

 

x86_64:

grub2-2.02-0.33.el7_2.x86_64.rpm

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-2.02-0.33.el7_2.x86_64.rpm

grub2-tools-2.02-0.33.el7_2.x86_64.rpm

 

Red Hat Enterprise Linux Workstation Optional (v. 7):

 

x86_64:

grub2-debuginfo-2.02-0.33.el7_2.x86_64.rpm

grub2-efi-modules-2.02-0.33.el7_2.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2015-8370

https://access.redhat.com/security/updates/classification/#moderate

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2015 Red Hat, Inc.

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