- -------------------------------------------------------------------------
Debian Security Advisory DSA-4867-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
March 02, 2021                        https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package        : grub2
CVE ID         : CVE-2020-14372 CVE-2020-25632 CVE-2020-25647 CVE-2020-27749
                 CVE-2020-27779 CVE-2021-20225 CVE-2021-20233

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 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

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

We recommend that you upgrade your grub2 packages.

For the detailed security status of grub2 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/source-package/grub2

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

Debian: DSA-4867-1: grub2 security update

March 2, 2021
Several vulnerabilities have been discovered in the GRUB2 bootloader

Summary

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 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

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

We recommend that you upgrade your grub2 packages.

For the detailed security status of grub2 please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/source-package/grub2

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org

Severity
Several vulnerabilities have been discovered in the GRUB2 bootloader.

Related News

23.Tablet Connections Esm H320
2 - 3 min read
The release of Ubuntu 24.04 LTS , also known as Noble Numbat, brings various security enhancements and exciting new features . These improvements
4.Lock AbstractDigital Esm H320
2 - 3 min read
Tails 6.2 is a new Linux distribution release that expands its multilingual support and improves security features. The distribution is a
19.Laptop Bed Esm H320
2 - 3 min read
AlmaLinux 9.4 beta has been released and provides compelling reasons to consider it for desktop usage. While AlmaLinux is primarily known as a
32.Lock Code Circular Esm H320
2 - 3 min read
Linux admins and security practitioners face significant challenges in keeping their Linux systems secure amidst the constant threat of kernel bugs.
1.Penguin Landscape Esm H320
2 - 3 min read
A significant security threat, known as the Spectre v2 exploit, has been observed targeting Linux systems running on modern Intel processors. Let's
10.FingerPrint Locks Esm H320
2 - 3 min read
The recent release of I2P 2.5.0 , an anonymous P2P network that protects against online censorship, surveillance, and monitoring, has brought a slew
24.Key Code Esm H320
2 - 3 min read
The Akira ransomware group has extorted approximately $42 million from over 250 victims since January 1, 2024. The group initially focused on
5.ShakingHands Esm H320
2 - 3 min read
At The Linux Foundation's Open Source Summit North America , Linus Torvalds, the creator of Linux, discussed various topics related to Linux
Sign Up

Get the Latest News & Insights

Sign up to get the latest security news affecting Linux and open source delivered straight to your inbox.

© 2024 Guardian Digital, Inc All Rights Reserved