RHSA-2020:3273: Moderate: grub2 security and bug fix update
First published: Mon Aug 03 2020(Updated: )
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.<br>The shim package contains a first-stage UEFI boot loader that handles chaining to a trusted full boot loader under secure boot environments.<br>Security Fix(es):<br><li> grub2: Crafted grub.cfg file can lead to arbitrary code execution during boot process (CVE-2020-10713)</li> <li> grub2: grub_malloc does not validate allocation size allowing for arithmetic overflow and subsequent heap-based buffer overflow (CVE-2020-14308)</li> <li> grub2: Integer overflow in grub_squash_read_symlink may lead to heap-based buffer overflow (CVE-2020-14309)</li> <li> grub2: Integer overflow read_section_as_string may lead to heap-based buffer overflow (CVE-2020-14310)</li> <li> grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflow (CVE-2020-14311)</li> <li> grub2: Fail kernel validation without shim protocol (CVE-2020-15705)</li> <li> grub2: Use-after-free redefining a function whilst the same function is already executing (CVE-2020-15706)</li> 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.<br>Bug Fix(es):<br><li> grub2 should get resynced with 7.8 branch (BZ#1861861)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/grub2 | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/shim | <15-8.el7 | 15-8.el7 |
| redhat/shim-signed | <15-8.el7_2 | 15-8.el7_2 |
| redhat/grub2 | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-common | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-debuginfo | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-aa64-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-ia32 | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-ia32-cdboot | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-ia32-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-x64 | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-x64-cdboot | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-efi-x64-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-pc | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-pc-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-ppc-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-ppc64-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-ppc64le-modules | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-tools | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-tools-extra | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/grub2-tools-minimal | <2.02-0.86.el7_2 | 2.02-0.86.el7_2 |
| redhat/mokutil | <15-8.el7_2 | 15-8.el7_2 |
| redhat/mokutil-debuginfo | <15-8.el7_2 | 15-8.el7_2 |
| redhat/shim | <15-8.el7_2 | 15-8.el7_2 |
| redhat/shim-unsigned-ia32 | <15-8.el7 | 15-8.el7 |
| redhat/shim-unsigned-x64 | <15-8.el7 | 15-8.el7 |
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