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Gentoo: GLSA-202209-12 High Severity: GRUB Secureboot Bypass

gentoo
Calendar Grey September 25, 2022
Dist Gentoo Esm H88
Critical vulnerabilities in GRUB could allow circumvention of secure boot protocols. An essential security notice from Gentoo recommends immediate upgrade for affected users.
Multiple vulnerabilities have been discovered in GRUB, the worst of which may allow for secureboot bypass.

Summary

Multiple vulnerabilities have been discovered in GRUB. Please review the CVE identifiers referenced below for details.

Topics%20covered

Topics Covered

security advisory high severity gentoo multiple issues bypass grub secureboot

Resolution

All GRUB users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-boot/grub-2.06-r3"
After upgrading, make sure to run the grub-install command with options appropriate for your system. See the GRUB2 Gentoo Wiki page for directions. Your system will be vulnerable until this action is performed.

References

[ 1 ] CVE-2021-3695 https://nvd.nist.gov/vuln/detail/CVE-2021-3695 [ 2 ] CVE-2021-3696 https://nvd.nist.gov/vuln/detail/CVE-2021-3696 [ 3 ] CVE-2021-3697 https://nvd.nist.gov/vuln/detail/CVE-2021-3697 [ 4 ] CVE-2021-3981 https://nvd.nist.gov/vuln/detail/CVE-2021-3981 [ 5 ] CVE-2022-28733 https://nvd.nist.gov/vuln/detail/CVE-2022-28733 [ 6 ] CVE-2022-28734 https://nvd.nist.gov/vuln/detail/CVE-2022-28734 [ 7 ] CVE-2022-28735 https://nvd.nist.gov/vuln/detail/CVE-2022-28735 [ 8 ] CVE-2022-28736 https://nvd.nist.gov/vuln/detail/CVE-2022-28736 [ 9 ] CVE-2022-28737 https://nvd.nist.gov/vuln/detail/CVE-2022-28737

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202209-12
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Concerns

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.

Severity: High
Title: GRUB: Multiple Vulnerabilities
Date: September 25, 2022
Bugs: #850535, #835082
ID: 202209-12

Topics%20covered

Topics Covered

security advisory high severity gentoo multiple issues bypass grub secureboot

Synopsis

Multiple vulnerabilities have been discovered in GRUB, the worst of which may allow for secureboot bypass.

Background

GNU GRUB is a multiboot boot loader used by most Linux systems.

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Affected Packages

------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-boot/grub < 2.06 >= 2.06

Impact

===== Please review the referenced CVE identifiers for details.

Workaround

There is no known workaround at this time.

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