CVE-2015-8370

HIGH

Grub2 1.98-2.02 - Integer Underflow via Backspace Characters in Authentication Functions

Title source: llm

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.

References (23)

Core 23

Core References

Vendor Advisory

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

Mailing List vendor-advisory

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

Mailing List vendor-advisory

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

Third Party Advisory, VDB Entry vdb-entry

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

Mailing List vendor-advisory

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

Third Party Advisory, VDB Entry vdb-entry

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

Mailing List vendor-advisory

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

Mailing List vendor-advisory

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

Mailing List mailing-list

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

Third Party Advisory, VDB Entry mailing-list

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

Mailing List vendor-advisory

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

Mailing List mailing-list

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

Third Party Advisory vendor-advisory

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

Mailing List, Third Party Advisory vendor-advisory

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

Vendor Advisory vendor-advisory

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

Mailing List, Third Party Advisory vendor-advisory

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

Vendor Advisory vendor-advisory

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

Mailing List vendor-advisory

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

Third Party Advisory vendor-advisory

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

Mailing List mailing-list

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

Exploit

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

Patch

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

Exploit, Third Party Advisory

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

Scores

CVSS v3 7.4

EPSS 0.0470

EPSS Percentile 89.5%

Attack Vector LOCAL

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-191 CWE-264

Status published

Products (6)

fedoraproject/fedora 23

gnu/grub2 1.98

gnu/grub2 1.99

gnu/grub2 2.00

gnu/grub2 2.01

gnu/grub2 2.02

Published Dec 16, 2015

Tracked Since Feb 18, 2026