RHSA-2021:0702: Red Hat Security Advisory: grub2 security update

An update for grub2 is now available for Red Hat Enterprise Linux 7.4 Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.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. Related CVEs:
• CVE-2020-14372: grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled
• CVE-2020-25632: grub2: Use-after-free in rmmod command
• CVE-2020-25647: grub2: Out-of-bounds write in grub_usb_device_initialize()
• CVE-2020-27749: grub2: Stack buffer overflow in grub_parser_split_cmdline()
• CVE-2020-27779: grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled
• CVE-2021-20225: grub2: Heap out-of-bounds write in short form option parser
• CVE-2021-20233: grub2: Heap out-of-bounds write due to miscalculation of space required for quoting