grub2-2.02-90.1.0.1.el8

エラータID: AXSA:2021-1565:02

Release date: 
Monday, March 8, 2021 - 14:08
Subject: 
grub2-2.02-90.1.0.1.el8
Affected Channels: 
Asianux Server 8 for x86_64
Severity: 
Moderate
Description: 

The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices.

Security Fix(es):

* 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)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

CVE-2020-14372
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2020-25632
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2020-25647
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2020-27749
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2020-27779
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2021-20225
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.
CVE-2021-20233
** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Solution: 

Update packages.

CVEs: 
CVE-2020-14372
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.
CVE-2020-25632
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.
CVE-2020-25647
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.
CVE-2020-27749
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.
CVE-2020-27779
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.
CVE-2021-20225
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.
CVE-2021-20233
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.
Additional Info: 

N/A

Download: 

SRPMS
  1. grub2-2.02-90.1.0.1.el8.src.rpm
    MD5: 7c5d5832797c09dfebc190041d498a94
    SHA-256: 20d375e312655ae03b56bc0533612e5b9d01d72303bc62d5c5ef821b69a6398a
    Size: 7.55 MB

Asianux Server 8 for x86_64
  1. grub2-common-2.02-90.1.0.1.el8.noarch.rpm
    MD5: f4915ae33773b5d43c6cd53c09583454
    SHA-256: b3fffc7aca7f2f93b1df695e6e830a817e25aff1580a3fdba434a09bba16e4af
    Size: 884.42 kB
  2. grub2-efi-ia32-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 3a70c55d776064443354e88974b74733
    SHA-256: eb4e3eedb3006e0549ed07ec4cc14f805f57c428bb8ea421f80c739a10eb0be6
    Size: 384.42 kB
  3. grub2-efi-ia32-cdboot-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: ae484565675d9983cd4add4b7f0ca3c0
    SHA-256: 4a0d74b3ea679c42a92de1d501a501a38733f139355bddc73931193949328159
    Size: 1.15 MB
  4. grub2-efi-ia32-modules-2.02-90.1.0.1.el8.noarch.rpm
    MD5: 956514117f07c1d0074a7515f1a57a4b
    SHA-256: 2652d204fbc5f328c6d30278e981117d8d9b198fb3c49c9f6a126db88ec2b78a
    Size: 0.98 MB
  5. grub2-efi-x64-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 7df86fa94a550617bb369f1dfeff3467
    SHA-256: 2d6e65bcf6b33f67dc5b3fe156af46414cea50d277908cddc4186e0398c34937
    Size: 406.68 kB
  6. grub2-efi-x64-cdboot-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 0d6057d11399812c40a9f78613e94aef
    SHA-256: b61548f72a05dde2efaa6c223e9e8d71a2dce646a39d29a27116358cd62717fe
    Size: 1.17 MB
  7. grub2-efi-x64-modules-2.02-90.1.0.1.el8.noarch.rpm
    MD5: c69dfe0d988e61b86f8c3b838a69f245
    SHA-256: 564c459a89f23116cbad3ee518bfc9a6df4699f44677407e5cec7f11400ab8da
    Size: 1.01 MB
  8. grub2-pc-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 881b87758b24c751fb6c25df07b45b3b
    SHA-256: 649cf2337fe0c2e9cd69e50794226ffe651b13bce5d4faba1e3ff13bc0a0703c
    Size: 37.99 kB
  9. grub2-tools-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 6f2a6381928e494f7ae8f1fc3112db9f
    SHA-256: 2ac6b940654e5176ac5b40ae9142c0601966249c6398c7c5f760ed5d06298ae5
    Size: 1.96 MB
  10. grub2-tools-efi-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 701456cd2b6294cdfd497434c6c12870
    SHA-256: 097691bacccebfe2af806b9f28c75c524b07862a7c43b8725edfd95ec52466d8
    Size: 469.71 kB
  11. grub2-tools-extra-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 531ffb267888079750b8816665dd4a10
    SHA-256: 129a029853e3005041c81cce925c6d951b2d9ccf193e6ecab18a3a091d2fdc50
    Size: 1.06 MB
  12. grub2-tools-minimal-2.02-90.1.0.1.el8.x86_64.rpm
    MD5: 5f6e5237b422a5a603e41879251ae1e2
    SHA-256: 8b597b993304ddf58198e62e5f575a65fb96a7b11f7ac9179828951d1076a415
    Size: 204.59 kB
  13. grub2-pc-modules-2.02-90.1.0.1.el8.noarch.rpm
    MD5: fc2d7752ba62b9588d17795502e5d589
    SHA-256: 97b38813cda6dabe132ded2558381cb70674200903fe7b7315f77567dc1e1523
    Size: 867.13 kB