CVE-2015-8370

Name	CVE-2015-8370
Description	Multiple integer underflows in Grub2 1.98 through 2.02 allow physically proximate attackers to bypass authentication, obtain sensitive information, or cause a denial of service (disk corruption) via backspace characters in the (1) grub_username_get function in grub-core/normal/auth.c or the (2) grub_password_get function in lib/crypto.c, which trigger an "Off-by-two" or "Out of bounds overwrite" memory error.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-368-1, DSA-3421-1
Debian Bugs	807614

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	fixed
	stretch (lts), stretch	2.02~beta3-5+deb9u3	fixed
	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	Origin	Debian Bugs
grub2	source	squeeze	1.98+20100804-14+squeeze2	DLA-368-1
grub2	source	wheezy	1.99-27+deb7u3	DSA-3421-1
grub2	source	jessie	2.02~beta2-22+deb8u1	DSA-3421-1
grub2	source	(unstable)	2.02~beta2-33		807614

https://twitter.com/lostinsecurity/status/674925944524640257
http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html