CVE-2015-8370 Information

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.

Reference

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.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