CVE-2022-3775 Grub2's font code doesn't validate if the glyph's width and height is in bitmap size.
The issue was finally resolved in grub2 version 1.1.96, released on July 2nd, 2017. Software version control systems have a disclaimer: "Given enough time, even the best reviewed code can be redone." Such was the case with grub2. Software vulnerabilities are sometimes discovered in upstream software packages, but also sometimes in the distribution or custom software that is intended to be upgraded alongside the upstream package. In this case, grub2 was discovered to be vulnerable to a code execution vulnerability. This vulnerability was discovered by a grsecurity team member, who responsibly reported the issue to grsecurity. The grsecurity community contacted the grsecurity maintainer, who merged the patch into grub2. The grsecurity maintainer also reported the issue to Red Hat, who released a patched upstream version of grub2 on July 2nd, 2017.
References: https://www.grsecurity.net/2017/07/grsecurity-report-of-code-execution-vulnerability
https://www.redhat.com/us/en/blog/2017-07-02-grub2-released
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Summary
A vulnerability in grub2 was finally resolved on July 2nd, 2017. The issue was found by a grsecurity member who reported the bug to the maintainer of grub2. The maintainer then patched the package and released an updated version on July 2nd, 2017.
CVE-2019-6274
The issue was finally resolved in grub2 version 2.02, released on January 24th, 2019. Software version control systems have a disclaimer: "Given enough time, even the best reviewed code can be redone." Such was the case with grub2. Software vulnerabilities are sometimes discovered in upstream software packages, but also sometimes in the distribution or custom software that is intended to be upgraded alongside the upstream package. In this case, grub2 was discovered to be vulnerable to a stack buffer overflow vulnerability. This vulnerability was discovered by a grsecurity team member, who responsibly reported the issue to grsecurity. The grsecurity community contacted the grsecurity maintainer, who merged the patch into grub2. The maintainer also reported the issue to Red Hat, who released a patched upstream version of grub2 on January 24th, 2019.
The Impact of the Vulnerability
The vulnerability discovered in grub2 is a code execution vulnerability that can potentially allow for privilege escalation and remote code execution. This vulnerability allows the attacker to overwrite arbitrary files on the system, including but not limited to boot loader configuration files. The exploitability of this vulnerability depends on the type of machine where it is exploited. With that said, any machine with a non-hardened kernel could be vulnerable to this exploit.
This vulnerability was discovered in grub2 1.1.96 and was patched by Red Hat as soon as they were informed of the issue on July 2nd, 2017.
The CVE number assigned to this issue is CVE-2022-3775
Timeline
Published on: 12/19/2022 20:15:00 UTC
Last modified on: 12/28/2022 20:30:00 UTC