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Test ID:1.3.6.1.4.1.25623.1.0.883262
Category:CentOS Local Security Checks
Title:CentOS: Security Advisory for grub2 (CESA-2020:3217)
Summary:The remote host is missing an update for the 'grub2'; package(s) announced via the CESA-2020:3217 advisory.
Description:Summary:
The remote host is missing an update for the 'grub2'
package(s) announced via the CESA-2020:3217 advisory.

Vulnerability Insight:
The grub2 packages provide version 2 of the Grand Unified Boot Loader
(GRUB), a highly configurable and customizable boot loader with modular
architecture. The packages support a variety of kernel formats, file
systems, computer architectures, and hardware devices.

The shim package contains a first-stage UEFI boot loader that handles
chaining to a trusted full boot loader under secure boot environments.

The fwupdate packages provide a service that allows session software to
update device firmware.

Security Fix(es):

* grub2: Crafted grub.cfg file can lead to arbitrary code execution during
boot process (CVE-2020-10713)

* grub2: grub_malloc does not validate allocation size allowing for
arithmetic overflow and subsequent heap-based buffer overflow
(CVE-2020-14308)

* grub2: Integer overflow in grub_squash_read_symlink may lead to
heap-based buffer overflow (CVE-2020-14309)

* grub2: Integer overflow read_section_as_string may lead to heap-based
buffer overflow (CVE-2020-14310)

* grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer
overflow (CVE-2020-14311)

* grub2: Fail kernel validation without shim protocol (CVE-2020-15705)

* grub2: Use-after-free redefining a function whilst the same function is
already executing (CVE-2020-15706)

* grub2: Integer overflow in initrd size handling (CVE-2020-15707)

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Bug Fix(es):

* grub2 doesn't handle relative paths correctly for UEFI HTTP Boot
(BZ#1616395)

* UEFI HTTP boot over IPv6 does not work (BZ#1732765)

Users of grub2 are advised to upgrade to these updated packages, which fix
these bugs.

Affected Software/OS:
'grub2' package(s) on CentOS 7.

Solution:
Please install the updated package(s).

CVSS Score:
4.6

CVSS Vector:
AV:L/AC:L/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2020-10713
Common Vulnerability Exposure (CVE) ID: CVE-2020-14308
Common Vulnerability Exposure (CVE) ID: CVE-2020-14309
Common Vulnerability Exposure (CVE) ID: CVE-2020-14310
Common Vulnerability Exposure (CVE) ID: CVE-2020-14311
Common Vulnerability Exposure (CVE) ID: CVE-2020-15705
Common Vulnerability Exposure (CVE) ID: CVE-2020-15706
Common Vulnerability Exposure (CVE) ID: CVE-2020-15707
CopyrightCopyright (C) 2020 Greenbone Networks GmbH

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