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Red Hat Enterprise Linux 7 RHSA-2015:2623 Moderate: Grub2 Access Flaw

red hat
Calendar Grey December 15, 2015
Dist Redhat Esm H88
Timely security patch released for grub2 components, correcting a vulnerability and enhancing password safeguards in Red Hat Enterprise Linux 7.
Updated grub2 packages that fix one security issue and one bug are now available for Red Hat Enterprise Linux 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory access control bug fix Red Hat Enterprise Linux moderate threat password protection grub2

References

https://access.redhat.com/security/cve/CVE-2015-8370 https://access.redhat.com/security/updates/classification/#moderate

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

Read the Full Advisory


Advisory ID: RHSA-2015:2623-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2015:2623.html
Issue date: 2015-12-15

Topic

Updated grub2 packages that fix one security issue and one bug are nowavailable for Red Hat Enterprise Linux 7.Red Hat Product Security has rated this update as having Moderate securityimpact. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available from the CVE link in theReferences section.

Topics%20covered

Topics Covered

security advisory access control bug fix Red Hat Enterprise Linux moderate threat password protection grub2

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

Bugs Fixed

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

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