Detections
Analytics

Debian DSA-4867-1 : grub2 - security update

high Nessus Plugin ID 146986

Language:

Synopsis

The remote Debian host is missing a security-related update.

Description

Several vulnerabilities have been discovered in the GRUB2 bootloader.

 - CVE-2020-14372 It was discovered that the acpi command allows a privileged user to load crafted ACPI tables when Secure Boot is enabled.

 - CVE-2020-25632 A use-after-free vulnerability was found in the rmmod command.

 - CVE-2020-25647 An out-of-bound write vulnerability was found in the grub_usb_device_initialize() function, which is called to handle USB device initialization.

 - CVE-2020-27749 A stack-based buffer overflow flaw was found in grub_parser_split_cmdline.

 - CVE-2020-27779 It was discovered that the cutmem command allows a privileged user to remove memory regions when Secure Boot is enabled.

 - CVE-2021-20225 A heap out-of-bounds write vulnerability was found in the short form option parser.

 - CVE-2021-20233 A heap out-of-bound write flaw was found caused by mis-calculation of space required for quoting in the menu rendering.

Further detailed information can be found at https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot

Solution

Upgrade the grub2 packages.

For the stable distribution (buster), these problems have been fixed in version 2.02+dfsg1-20+deb10u4.

See Also

https://security-tracker.debian.org/tracker/CVE-2020-14372

https://security-tracker.debian.org/tracker/CVE-2020-25632

https://security-tracker.debian.org/tracker/CVE-2020-25647

https://security-tracker.debian.org/tracker/CVE-2020-27749

https://security-tracker.debian.org/tracker/CVE-2020-27779

https://security-tracker.debian.org/tracker/CVE-2021-20225

https://security-tracker.debian.org/tracker/CVE-2021-20233

https://www.debian.org/security/2021-GRUB-UEFI-SecureBoot

https://security-tracker.debian.org/tracker/source-package/grub2

https://packages.debian.org/source/buster/grub2

https://www.debian.org/security/2021/dsa-4867

Plugin Details

Severity: High

ID: 146986

File Name: debian_DSA-4867.nasl

Version: 1.4

Type: local

Agent: unix

Published: 3/3/2021

Updated: 1/18/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2021-20233

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:grub2

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/2/2021

Vulnerability Publication Date: 3/3/2021

Reference Information

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

DSA: 4867