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Ubuntu 20.04 LTS: USN-4432-1 Critical: GRUB 2 Buffer Overflow Threat

ubuntu
Calendar Grey July 29, 2020
Dist Ubuntu Esm H88
Enhancements to GRUB 2 in Ubuntu address various critical vulnerabilities, providing comprehensive instructions on implementation.
Several security issues were fixed in GRUB 2.

Summary

Topics%20covered

Topics Covered

security advisory buffer overflow Ubuntu local attack GRUB 2 signed vulnerabilities

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: grub-efi-amd64-bin 2.04-1ubuntu26.1 grub-efi-amd64-signed 1.142.3+2.04-1ubuntu26.1 grub-efi-arm-bin 2.04-1ubuntu26.1 grub-efi-arm64-bin 2.04-1ubuntu26.1 grub-efi-arm64-signed 1.142.3+2.04-1ubuntu26.1 grub-efi-ia32-bin 2.04-1ubuntu26.1 Ubuntu 18.04 LTS: grub-efi-amd64-bin 2.02-2ubuntu8.16 grub-efi-amd64-signed 1.93.18+2.02-2ubuntu8.16 grub-efi-arm-bin 2.02-2ubuntu8.16 grub-efi-arm64-bin 2.02-2ubuntu8.16 grub-efi-arm64-signed 1.93.18+2.02-2ubuntu8.16 grub-efi-ia32-bin 2.02-2ubuntu8.16 grub-efi-ia64-bin 2.02-2ubuntu8.16 Ubuntu 16.04 LTS: grub-efi-amd64-bin 2.02~beta2-36ubuntu3.26 grub-efi-amd64-signed 1.66.26+2.02~beta2-36ubuntu3.26 grub-efi-arm-bin 2.02~beta2-36ubuntu3.26 grub-efi-arm64-bin 2.02~beta2-36ubuntu3.26 grub-efi-arm64-signed 1.66.26+2.02~beta2-36ubuntu3.26 grub-efi-ia32-bin 2.02~beta2-36ubuntu3.26 grub-efi-ia64-bin 2.02~beta2-36ubuntu3.26 Ubuntu 14.04 ESM: grub-efi-amd64-bin 2.02~beta2-9ubuntu1.20 grub-efi-amd64-signed 1.34.22+2.02~beta2-9ubuntu1.20 grub-efi-arm-bin 2.02~beta2-9ubuntu1.20 grub-efi-arm64-bin 2.02~beta2-9ubuntu1.20 grub-efi-ia32-bin 2.02~beta2-9ubuntu1.20 grub-efi-ia64-bin 2.02~beta2-9ubuntu1.20 Fully mitigating these vulnerabilities requires both an updated GRUB2 boot loader and the application of a UEFI Revocation List (dbx) to system firmware. Ubuntu will provide a packaged dbx update at a later time, though system adminstrators may choose to apply a third party dbx update before then. For more details on mitigation steps and the risks entailed (especially for dual/multi-boot scenarios), please see the Knowledge Base article at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass

References

https://ubuntu.com/security/notices/USN-4432-1

CVE-2020-10713, CVE-2020-14308, CVE-2020-14309, CVE-2020-14310,

CVE-2020-14311, CVE-2020-15705, CVE-2020-15706, CVE-2020-15707,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass

Severity
critical
Lowest
Low
Medium
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Critical

July 29, 2020

Topics%20covered

Topics Covered

security advisory buffer overflow Ubuntu local attack GRUB 2 signed vulnerabilities

Package Information

https://launchpad.net/ubuntu/+source/grub2/2.04-1ubuntu26.1 https://launchpad.net/ubuntu/+source/grub2-signed/1.142.3 https://launchpad.net/ubuntu/+source/grub2/2.02-2ubuntu8.16 https://launchpad.net/ubuntu/+source/grub2-signed/1.93.18 https://launchpad.net/ubuntu/+source/grub2/2.02~beta2-36ubuntu3.26 https://launchpad.net/ubuntu/+source/grub2-signed/1.66.26

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