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RHEL 7 : grub2 (RHSA-2020:3274)
high Nessus Plugin ID 139294
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Synopsis
The remote Red Hat host is missing one or more security updates for grub2.Description
The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:3274 advisory.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 should get resynced with 7.8 branch (BZ#1861855)
Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.
Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.
Solution
Update the RHEL grub2 package based on the guidance in RHSA-2020:3274.See Also
http://www.nessus.org/u?796aa93d
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/security/vulnerabilities/grub2bootloader
https://access.redhat.com/errata/RHSA-2020:3274
https://bugzilla.redhat.com/show_bug.cgi?id=1825243
https://bugzilla.redhat.com/show_bug.cgi?id=1852009
https://bugzilla.redhat.com/show_bug.cgi?id=1852014
https://bugzilla.redhat.com/show_bug.cgi?id=1852022
https://bugzilla.redhat.com/show_bug.cgi?id=1852030
https://bugzilla.redhat.com/show_bug.cgi?id=1860978
https://bugzilla.redhat.com/show_bug.cgi?id=1861118
Plugin Details
Severity: High
ID: 139294
File Name: redhat-RHSA-2020-3274.nasl
Version: 1.15
Type: local
Agent: unix
Family: Red Hat Local Security Checks
Published: 8/3/2020
Updated: 11/7/2024
Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus
Risk Information
VPR
Risk Factor: High
Score: 7.4
Vendor
Vendor Severity: Moderate
CVSS v2
Risk Factor: Medium
Base Score: 4.6
Temporal Score: 3.6
Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS Score Source: CVE-2020-14309
CVSS v3
Risk Factor: High
Base Score: 8.2
Temporal Score: 7.4
Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C
CVSS Score Source: CVE-2020-10713
Vulnerability Information
CPE: p-cpe:/a:redhat:enterprise_linux:mokutil, p-cpe:/a:redhat:enterprise_linux:grub2-ppc-modules, cpe:/o:redhat:rhel_eus:7.7, p-cpe:/a:redhat:enterprise_linux:grub2-tools-minimal, p-cpe:/a:redhat:enterprise_linux:fwupdate, p-cpe:/a:redhat:enterprise_linux:grub2-tools, p-cpe:/a:redhat:enterprise_linux:shim-unsigned-x64, p-cpe:/a:redhat:enterprise_linux:shim-unsigned-ia32, p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-cdboot, p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32-modules, p-cpe:/a:redhat:enterprise_linux:grub2-pc-modules, p-cpe:/a:redhat:enterprise_linux:grub2-tools-extra, p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-modules, p-cpe:/a:redhat:enterprise_linux:shim-ia32, p-cpe:/a:redhat:enterprise_linux:fwupdate-libs, p-cpe:/a:redhat:enterprise_linux:grub2-common, p-cpe:/a:redhat:enterprise_linux:shim-x64, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64-modules, p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64, p-cpe:/a:redhat:enterprise_linux:fwupdate-efi, p-cpe:/a:redhat:enterprise_linux:grub2, p-cpe:/a:redhat:enterprise_linux:grub2-pc, p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32-cdboot, p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32, p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-modules, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le, p-cpe:/a:redhat:enterprise_linux:shim, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le-modules, p-cpe:/a:redhat:enterprise_linux:shim-signed, p-cpe:/a:redhat:enterprise_linux:fwupdate-devel
Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 8/3/2020
Vulnerability Publication Date: 7/29/2020
Reference Information
CVE: CVE-2020-10713, CVE-2020-14308, CVE-2020-14309, CVE-2020-14310, CVE-2020-14311, CVE-2020-15705, CVE-2020-15706, CVE-2020-15707