RLSA-2021:1734

Dashboard / Vulnerabilities / RLSA-2021:1734

RLSA-2021:1734

Summary: Moderate: shim security update

Details: 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) 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 Rocky Linux 8.4 Release Notes linked from the References section.

References: https://errata.rockylinux.org/RLSA-2021:1734, https://bugzilla.redhat.com/show_bug.cgi?id=1873150, https://bugzilla.redhat.com/show_bug.cgi?id=1879577, https://bugzilla.redhat.com/show_bug.cgi?id=1886936, https://bugzilla.redhat.com/show_bug.cgi?id=1899966, https://bugzilla.redhat.com/show_bug.cgi?id=1900698, https://bugzilla.redhat.com/show_bug.cgi?id=1924696, https://bugzilla.redhat.com/show_bug.cgi?id=1926263