QID 239315

Date Published: 2021-05-20

QID 239315: Red Hat Update for shim (RHSA-2021:1734)

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: 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)

Affected Products:

Red Hat Enterprise Linux for x86_64 8 x86_64
Red Hat Enterprise Linux for ARM 64 8 aarch64
Red Hat CodeReady Linux Builder for x86_64 8 x86_64
Red Hat CodeReady Linux Builder for ARM 64 8 aarch64

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.

On successful exploitation, it could allow an attacker to execute code.

  • CVSS V3 rated as Critical - 8.2 severity.
  • CVSS V2 rated as High - 7.2 severity.
    • Solution
    Upgrade to the latest packages which contain a patch. Refer to Applying Package Updates to RHEL system for details.

    Refer to Red Hat security advisory RHSA-2021:1734 to address this issue and obtain more information.

    Vendor References

    CVEs related to QID 239315

    CVE-2020-14372 | CVE-2020-25632 | CVE-2020-25647 | CVE-2020-27749 | CVE-2020-27779 | CVE-2021-20225 | CVE-2021-20233 |
    Software Advisories
    Advisory ID Software Component Link
    RHSA-2021:1734 Red Hat Enterprise Linux URL Logo access.redhat.com/errata/RHSA-2021:1734?language=en
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