Vulnerability Details CVE-2015-8370
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.029
EPSS Ranking 85.7%
CVSS Severity
CVSS v3 Score 7.4
CVSS v2 Score 6.9
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
Products affected by CVE-2015-8370
-
cpe:2.3:a:gnu:grub2:1.98
-
cpe:2.3:a:gnu:grub2:1.99
-
cpe:2.3:a:gnu:grub2:2.00
-
cpe:2.3:a:gnu:grub2:2.01
-
cpe:2.3:a:gnu:grub2:2.02
-
cpe:2.3:o:fedoraproject:fedora:23