CLSA-2022-1655822366 Update of grub2

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grub2: shim_lock verifier allows non-kernel files to be loaded

A flaw was found in grub2. The shimlock verifier from grub2 allows non-kernel files to be loaded when secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should not be allowed...

grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap

A flaw was found in grub 2, where a crafted 16-bit grayscale PNG image may lead to an out-of-bounds write. This flaw allows an attacker to corrupt the data on the heap portion of the grub2's memory, leading to possible code execution and the circumvention of the secure boot mechanism...

grub2: Out-of-bound write when handling split HTTP headers

A flaw was found in grub2 when handling split HTTP headers. While processing a split HTTP header, grub2 wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-bounds write. This flaw allows an attacker to leverage this issue by crafting a maliciou...

grub2: Out-of-bound write when handling split HTTP headers

A flaw was found in grub2 when handling split HTTP headers. While processing a split HTTP header, grub2 wrongly advances its control pointer to the internal buffer by one position, which can lead to an out-of-bounds write. This flaw allows an attacker to leverage this issue by crafting a maliciou...

grub2: shim_lock verifier allows non-kernel files to be loaded

A flaw was found in grub2. The shimlock verifier from grub2 allows non-kernel files to be loaded when secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should not be allowed...

grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap

A flaw was found in grub 2, where a crafted 16-bit grayscale PNG image may lead to an out-of-bounds write. This flaw allows an attacker to corrupt the data on the heap portion of the grub2's memory, leading to possible code execution and the circumvention of the secure boot mechanism...

grub2: shim_lock verifier allows non-kernel files to be loaded

A flaw was found in grub2. The shimlock verifier from grub2 allows non-kernel files to be loaded when secure boot is enabled, giving the possibility of unverified code or modules to be loaded when it should not be allowed...

grub2 缓冲区错误漏洞

grub2 is a Linux system boot program from the GNU community. A buffer error vulnerability exists in grub2, which can be exploited by an attacker to cause a buffer underflow write in the heap via a carefully crafted JPEG image...

The vulnerability of the Grub2 operating system loader’s “cutmem” command implementation allows a perpetrator to gain access to confidential data, affect the integrity of the data, and cause service failures.

The vulnerability of the cutmem command in the Grub2b operating system loader is related to a violation of authentication mechanisms. Exploiting this vulnerability can allow an attacker to access confidential data, compromise data integrity, and cause service failures...

grub2 安全漏洞

grub2 is a Linux system boot program from the American GNU community. A security vulnerability exists in grub2 that stems from incorrect permissions in grub.cfg, which allow unprivileged users to read the contents of the file...

grub2: Use-after-free in rmmod command

A flaw was found in grub2. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The...

grub2: Heap out-of-bounds write in short form option parser

A flaw was found in grub2. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as syste...

Fedora: Security Advisory for grub2 (FEDORA-2021-c5ed9c3970)

The remote host is missing an update for the Copyright C 2021 Greenbone Networks GmbH Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-or-later This program is free software; you can...

A flaw was found in grub2 in versions prior to 2.06 where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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DEBIAN-CVE-2021-20233

A flaw was found in grub2 in versions prior to 2.06. Setparamprefix in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one...

grub2 缓冲区错误漏洞

grub2 is a Linux system boot program from the GNU community. A buffer overflow vulnerability exists in grub2 versions prior to 2.06 in the grubusbdeviceinitialize function, which handles USB device initialization. No details of the vulnerability are provided at this time...

grub2 资源管理错误漏洞

grub2 is a Linux system boot program from the GNU community. A resource management error vulnerability exists in grub2 versions prior to 2.06, which stems from the rmmod command. No details of the vulnerability are provided at this time...

grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled

A flaw was found in GRUB 2, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table SSDT containing code to overwrite the Linux kernel lockdown variable content direct...

grub2: Use-after-free in rmmod command

A flaw was found in grub2. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The...