CVE-2020-10713

Name	CVE-2020-10713
Description	A flaw was found in grub2, prior to version 2.06. An attacker may use the GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw also allows the bypass of Secure Boot protections. In order to load an untrusted or modified kernel, an attacker would first need to establish access to the system such as gaining physical access, obtain the ability to alter a pxe-boot network, or have remote access to a networked system with root access. With this access, an attacker could then craft a string to cause a buffer overflow by injecting a malicious payload that leads to arbitrary code execution within GRUB. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-4735-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
grub2 (PTS)	jessie, jessie (lts)	2.02~beta2-22+deb8u2	vulnerable
	stretch (lts), stretch	2.02~beta3-5+deb9u3	vulnerable
	buster (security), buster, buster (lts)	2.06-3~deb10u4	fixed
	bullseye (security), bullseye	2.06-3~deb11u6	fixed
	bookworm (security), bookworm	2.06-13+deb12u1	fixed
	sid, trixie	2.12-5	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
grub2	source	buster	2.02+dfsg1-20+deb10u1		DSA-4735-1
grub2	source	(unstable)	2.04-9

Notes

[stretch] - grub2 <ignored> (No SecureBoot support in stretch)
https://www.eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/
https://www.openwall.com/lists/oss-security/2020/07/29/3
https://git.savannah.gnu.org/gitweb/?p=grub.git;a=commit;h=a4d3fbdff1e3ca8f87642af2ac8752c30c617a3e
[jessie] - grub2 <ignored> (No SecureBoot support in jessie)