Описание
Security update for grub2
This update for grub2 fixes the following issues:
grub2 implements the new 'SBAT' method for SHIM based secure boot revocation. (bsc#1182057)
- CVE-2020-25632: Fixed a use-after-free in rmmod command (bsc#1176711)
- CVE-2020-25647: Fixed an out-of-bound write in grub_usb_device_initialize() (bsc#1177883)
- CVE-2020-27749: Fixed a stack buffer overflow in grub_parser_split_cmdline (bsc#1179264)
- CVE-2020-27779, CVE-2020-14372: Disallow cutmem and acpi commands in secure boot mode (bsc#1179265 bsc#1175970)
- CVE-2021-20225: Fixed a heap out-of-bounds write in short form option parser (bsc#1182262)
- CVE-2021-20233: Fixed a heap out-of-bound write due to mis-calculation of space required for quoting (bsc#1182263)
Список пакетов
Image SLES15-SP2-Azure-Basic
Image SLES15-SP2-Azure-Standard
Image SLES15-SP2-BYOS-Azure
Image SLES15-SP2-BYOS-EC2-HVM
Image SLES15-SP2-BYOS-GCE
Image SLES15-SP2-CHOST-BYOS-Aliyun
Image SLES15-SP2-CHOST-BYOS-Azure
Image SLES15-SP2-CHOST-BYOS-EC2
Image SLES15-SP2-CHOST-BYOS-GCE
Image SLES15-SP2-EC2-ECS-HVM
Image SLES15-SP2-EC2-HVM
Image SLES15-SP2-GCE
Image SLES15-SP2-HPC-Azure
Image SLES15-SP2-HPC-BYOS-Azure
Image SLES15-SP2-HPC-BYOS-EC2-HVM
Image SLES15-SP2-Manager-4-1-Proxy-BYOS-Azure
Image SLES15-SP2-Manager-4-1-Proxy-BYOS-EC2-HVM
Image SLES15-SP2-Manager-4-1-Proxy-BYOS-GCE
Image SLES15-SP2-Manager-4-1-Server-BYOS-Azure
Image SLES15-SP2-Manager-4-1-Server-BYOS-EC2-HVM
Image SLES15-SP2-Manager-4-1-Server-BYOS-GCE
Image SLES15-SP2-SAP-Azure
Image SLES15-SP2-SAP-Azure-LI-BYOS-Production
Image SLES15-SP2-SAP-Azure-VLI-BYOS-Production
Image SLES15-SP2-SAP-BYOS-Azure
Image SLES15-SP2-SAP-BYOS-EC2-HVM
Image SLES15-SP2-SAP-BYOS-GCE
Image SLES15-SP2-SAP-EC2-HVM
Image SLES15-SP2-SAP-GCE
SUSE Linux Enterprise Module for Basesystem 15 SP2
SUSE Linux Enterprise Module for Server Applications 15 SP2
Ссылки
- Link for SUSE-SU-2021:0683-1
- E-Mail link for SUSE-SU-2021:0683-1
- SUSE Security Ratings
- SUSE Bug 1175970
- SUSE Bug 1176711
- SUSE Bug 1177883
- SUSE Bug 1179264
- SUSE Bug 1179265
- SUSE Bug 1182057
- SUSE Bug 1182262
- SUSE Bug 1182263
- SUSE CVE CVE-2020-14372 page
- SUSE CVE CVE-2020-25632 page
- SUSE CVE CVE-2020-25647 page
- SUSE CVE CVE-2020-27749 page
- SUSE CVE CVE-2020-27779 page
- SUSE CVE CVE-2021-20225 page
- SUSE CVE CVE-2021-20233 page
Описание
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.
Затронутые продукты
Ссылки
- CVE-2020-14372
- SUSE Bug 1175970
Описание
A flaw was found in grub2 in versions prior to 2.06. 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 highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Затронутые продукты
Ссылки
- CVE-2020-25632
- SUSE Bug 1176711
Описание
A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Затронутые продукты
Ссылки
- CVE-2020-25647
- SUSE Bug 1177883
Описание
A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Затронутые продукты
Ссылки
- CVE-2020-27749
- SUSE Bug 1179264
Описание
A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Затронутые продукты
Ссылки
- CVE-2020-27779
- SUSE Bug 1179265
Описание
A flaw was found in grub2 in versions prior to 2.06. 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 system availability.
Затронутые продукты
Ссылки
- CVE-2021-20225
- SUSE Bug 1182262
Описание
A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() 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 byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Затронутые продукты
Ссылки
- CVE-2021-20233
- SUSE Bug 1182263
- SUSE Bug 1183135