CVE-2015-8370

Severity: medium (CVSS 6.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2015-12-16 · updated 2026-06-17
Weakness: CWE-264

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 products

Fedoraproject Fedora: 23
grub2: 1.98, 1.99, 2.00, 2.01, 2.02

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

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