CVE-2015-8370

Published: Dec 16, 2015Modified: May 6, 2026

7.4

Vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.4 / Impact: 5.9

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Affected (6)

Products: Gnu: Grub2 · Fedoraproject: Fedora

1 product

1 product

Configuration A

5 vulnerable

Vulnerable Software	Affected Versions
Gnu Grub2	Version 1.98
Gnu Grub2	Version 1.99
Gnu Grub2	Version 2.00
Gnu Grub2	Version 2.01
Gnu Grub2	Version 2.02

Configuration B

1 vulnerable

Vulnerable Software	Affected Versions
Fedoraproject Fedora	Version 23

Related CWEs

Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

References (46)

http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html

Source: cve@mitre.org

Exploit

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html

Source: cve@mitre.org

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html

Source: cve@mitre.org

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html

Source: cve@mitre.org

http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html

Source: cve@mitre.org

http://rhn.redhat.com/errata/RHSA-2015-2623.html

Source: cve@mitre.org

http://seclists.org/fulldisclosure/2015/Dec/69

Source: cve@mitre.org

http://www.debian.org/security/2015/dsa-3421

Source: cve@mitre.org

http://www.openwall.com/lists/oss-security/2015/12/15/6

Source: cve@mitre.org

http://www.openwall.com/lists/oss-security/2024/01/15/3

Source: cve@mitre.org

http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html

Source: cve@mitre.org

Patch

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

Source: cve@mitre.org

http://www.securityfocus.com/archive/1/537115/100/0/threaded

Source: cve@mitre.org

http://www.securityfocus.com/bid/79358

Source: cve@mitre.org

http://www.securitytracker.com/id/1034422

Source: cve@mitre.org

http://www.ubuntu.com/usn/USN-2836-1

Source: cve@mitre.org

https://security.gentoo.org/glsa/201512-03

Source: cve@mitre.org

http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html

Source: af854a3a-2127-422b-91ae-364da2661108

Exploit

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://rhn.redhat.com/errata/RHSA-2015-2623.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://seclists.org/fulldisclosure/2015/Dec/69

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.debian.org/security/2015/dsa-3421

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2015/12/15/6

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2024/01/15/3

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html

Source: af854a3a-2127-422b-91ae-364da2661108

Patch

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.securityfocus.com/archive/1/537115/100/0/threaded

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.securityfocus.com/bid/79358

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.securitytracker.com/id/1034422

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.ubuntu.com/usn/USN-2836-1

Source: af854a3a-2127-422b-91ae-364da2661108

https://security.gentoo.org/glsa/201512-03

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.