Threat Encyclopedia

RHSA-2021:1734-Security Advisory

Description

The vulnerabilities in the following products could cause the system to become vulnerable to malicious security attack: shim

Analysis

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) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 8.4 Release Notes linked from the References section. SolutionFor details on how to apply this update, which includes the changes described in this advisory, refer to:https://access.redhat.com/articles/11258

Affected Products

shim