CVE-2015-8370

EUVD-2015-8254
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.
Wrap or Wraparound
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.4 HIGH
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA-ADPADP
7.4 HIGH
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 86%
Affected Products (NVD)
VendorProductVersion
gnugrub2
1.98
gnugrub2
1.99
gnugrub2
2.00
gnugrub2
2.01
gnugrub2
2.02
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
grub2
bookworm
2.06-13+deb12u1
fixed
bookworm (security)
2.06-13+deb12u1
fixed
bullseye
2.06-3~deb11u6
fixed
bullseye (security)
2.06-3~deb11u6
fixed
sid
2.12-5
fixed
trixie
2.12-5
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
grub2
precise
Fixed 1.99-21ubuntu3.19
released
trusty
Fixed 2.02~beta2-9ubuntu1.6
released
vivid
Fixed 2.02~beta2-22ubuntu1.4
released
wily
Fixed 2.02~beta2-29ubuntu0.2
released
Common Weakness Enumeration
References
http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
http://rhn.redhat.com/errata/RHSA-2015-2623.html
http://seclists.org/fulldisclosure/2015/Dec/69
http://www.debian.org/security/2015/dsa-3421
http://www.openwall.com/lists/oss-security/2015/12/15/6
http://www.openwall.com/lists/oss-security/2024/01/15/3
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/archive/1/537115/100/0/threaded
http://www.securityfocus.com/bid/79358
http://www.securitytracker.com/id/1034422
http://www.ubuntu.com/usn/USN-2836-1
https://security.gentoo.org/glsa/201512-03
http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html
http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html
http://rhn.redhat.com/errata/RHSA-2015-2623.html
http://seclists.org/fulldisclosure/2015/Dec/69
http://www.debian.org/security/2015/dsa-3421
http://www.openwall.com/lists/oss-security/2015/12/15/6
http://www.openwall.com/lists/oss-security/2024/01/15/3
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/archive/1/537115/100/0/threaded
http://www.securityfocus.com/bid/79358
http://www.securitytracker.com/id/1034422
http://www.ubuntu.com/usn/USN-2836-1
https://security.gentoo.org/glsa/201512-03