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redhatRedHatRHSA-2022:5095
HistoryJun 16, 2022 - 1:10 p.m.

(RHSA-2022:5095) Important: grub2, mokutil, shim, and shim-unsigned-x64 security update

2022-06-1613:10:10
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24

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

0.001 Low

EPSS

Percentile

25.7%

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.

The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.

Security Fix(es):

  • grub2: Integer underflow in grub_net_recv_ip4_packets (CVE-2022-28733)

  • grub2: Crafted PNG grayscale images may lead to out-of-bounds write in heap (CVE-2021-3695)

  • grub2: Crafted PNG image may lead to out-of-bound write during huffman table handling (CVE-2021-3696)

  • grub2: Crafted JPEG image can lead to buffer underflow write in the heap (CVE-2021-3697)

  • grub2: Out-of-bound write when handling split HTTP headers (CVE-2022-28734)

  • grub2: shim_lock verifier allows non-kernel files to be loaded (CVE-2022-28735)

  • grub2: use-after-free in grub_cmd_chainloader() (CVE-2022-28736)

  • shim: Buffer overflow when loading crafted EFI images (CVE-2022-28737)

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.

8.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

6.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:M/Au:N/C:C/I:C/A:C

0.001 Low

EPSS

Percentile

25.7%