QID 240473

Date Published: 2022-06-20

QID 240473: Red Hat Update for grub2, mokutil, shim, and shim-unsigned-x64 (RHSA-2022:5100)

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: 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)

Affected Products:

  • Red Hat enterprise linux for x86_64 - extended update support 8.2 x86_64
  • Red Hat enterprise linux server - aus 8.2 x86_64
  • Red Hat enterprise linux for power, little endian - extended update support 8.2 ppc64le
  • Red Hat enterprise linux server - tus 8.2 x86_64
  • Red Hat enterprise linux for arm 64 - extended update support 8.2 aarch64
  • Red Hat enterprise linux server for power le - update services for sap solutions 8.2 ppc64le
  • Red Hat enterprise linux for x86_64 - update services for sap solutions 8.2 x86_64
  • Red Hat codeready linux builder for x86_64 - extended update support 8.2 x86_64



Note: The preceding description block is extracted directly from the security advisory. Using automation, we have attempted to clean and format it as much as possible without introducing additional issues.

Successful exploitation of this vulnerability could lead to a security breach or could affect integrity, availability, and confidentiality.

  • CVSS V3 rated as Critical - 8.6 severity.
  • CVSS V2 rated as Medium - 5.4 severity.
    • Solution
    Refer to Red Hat security advisory RHSA-2022:5100 for updates and patch information.
    Vendor References

    CVEs related to QID 240473

    CVE-2021-3695 | CVE-2021-3696 | CVE-2021-3697 | CVE-2022-28733 | CVE-2022-28734 | CVE-2022-28735 | CVE-2022-28736 | CVE-2022-28737 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2022:5100 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2022:5100
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