RHEL 7 : grub2 (RHSA-2021:0699)

high Nessus Plugin ID 146961
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2021:0699 advisory.

- grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372)

- grub2: Use-after-free in rmmod command (CVE-2020-25632)

- grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)

- grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)

- grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779)

- grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)

- grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://cwe.mitre.org/data/definitions/121.html

https://cwe.mitre.org/data/definitions/184.html

https://cwe.mitre.org/data/definitions/285.html

https://cwe.mitre.org/data/definitions/416.html

https://cwe.mitre.org/data/definitions/787.html

https://access.redhat.com/security/cve/CVE-2020-14372

https://access.redhat.com/security/cve/CVE-2020-25632

https://access.redhat.com/security/cve/CVE-2020-25647

https://access.redhat.com/security/cve/CVE-2020-27749

https://access.redhat.com/security/cve/CVE-2020-27779

https://access.redhat.com/security/cve/CVE-2021-20225

https://access.redhat.com/security/cve/CVE-2021-20233

https://access.redhat.com/errata/RHSA-2021:0699

https://bugzilla.redhat.com/1873150

https://bugzilla.redhat.com/1879577

https://bugzilla.redhat.com/1886936

https://bugzilla.redhat.com/1899966

https://bugzilla.redhat.com/1900698

https://bugzilla.redhat.com/1924696

https://bugzilla.redhat.com/1926263

Plugin Details

Severity: High

ID: 146961

File Name: redhat-RHSA-2021-0699.nasl

Version: 1.8

Type: local

Agent: unix

Published: 3/3/2021

Updated: 7/26/2021

Dependencies: ssh_get_info.nasl, redhat_repos.nasl

Risk Information

CVSS Score Source: CVE-2021-20233

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.3

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:redhat:enterprise_linux:grub2, p-cpe:/a:redhat:enterprise_linux:grub2-common, p-cpe:/a:redhat:enterprise_linux:grub2-efi-aa64-modules, p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32, p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32-cdboot, p-cpe:/a:redhat:enterprise_linux:grub2-efi-ia32-modules, p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64, p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-cdboot, p-cpe:/a:redhat:enterprise_linux:grub2-efi-x64-modules, p-cpe:/a:redhat:enterprise_linux:grub2-pc, p-cpe:/a:redhat:enterprise_linux:grub2-pc-modules, p-cpe:/a:redhat:enterprise_linux:grub2-ppc-modules, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64-modules, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le, p-cpe:/a:redhat:enterprise_linux:grub2-ppc64le-modules, p-cpe:/a:redhat:enterprise_linux:grub2-tools, p-cpe:/a:redhat:enterprise_linux:grub2-tools-extra, p-cpe:/a:redhat:enterprise_linux:grub2-tools-minimal

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 3/2/2021

Vulnerability Publication Date: 7/30/2020

Reference Information

CVE: CVE-2020-14372, CVE-2020-25632, CVE-2020-25647, CVE-2020-27749, CVE-2020-27779, CVE-2021-20225, CVE-2021-20233

RHSA: 2021:0699

IAVA: 2020-A-0349

CWE: 121, 184, 285, 416, 787