Vulnerability Monitor

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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.

Published

2015-12-16T21:59:04.063

Last Modified

2025-04-12T10:46:40.837

Status

Deferred

Source

[email protected]

Severity

CVSSv3.1: 7.4 (HIGH)

CVSSv2 Vector

AV:L/AC:M/Au:N/C:C/I:C/A:C

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: COMPLETE
Integrity Impact: COMPLETE
Availability Impact: COMPLETE

Exploitability Score

3.4

Impact Score

10.0

Weaknesses

Type: Primary
CWE-264
Type: Secondary
CWE-191

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	gnu	grub2	1.98	Yes
Application	gnu	grub2	1.99	Yes
Application	gnu	grub2	2.00	Yes
Application	gnu	grub2	2.01	Yes
Application	gnu	grub2	2.02	Yes
Operating System	fedoraproject	fedora	23	Yes

References

http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html Exploit ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html ([email protected])
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html ([email protected])
http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html ([email protected])
http://rhn.redhat.com/errata/RHSA-2015-2623.html ([email protected])
http://seclists.org/fulldisclosure/2015/Dec/69 ([email protected])
http://www.debian.org/security/2015/dsa-3421 ([email protected])
http://www.openwall.com/lists/oss-security/2015/12/15/6 ([email protected])
http://www.openwall.com/lists/oss-security/2024/01/15/3 ([email protected])
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html Patch ([email protected])
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html ([email protected])
http://www.securityfocus.com/archive/1/537115/100/0/threaded ([email protected])
http://www.securityfocus.com/bid/79358 ([email protected])
http://www.securitytracker.com/id/1034422 ([email protected])
http://www.ubuntu.com/usn/USN-2836-1 ([email protected])
https://security.gentoo.org/glsa/201512-03 ([email protected])
http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html Exploit (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/173703.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174049.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00044.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html (af854a3a-2127-422b-91ae-364da2661108)
http://rhn.redhat.com/errata/RHSA-2015-2623.html (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2015/Dec/69 (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2015/dsa-3421 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2015/12/15/6 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2024/01/15/3 (af854a3a-2127-422b-91ae-364da2661108)
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html Patch (af854a3a-2127-422b-91ae-364da2661108)
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/archive/1/537115/100/0/threaded (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/79358 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id/1034422 (af854a3a-2127-422b-91ae-364da2661108)
http://www.ubuntu.com/usn/USN-2836-1 (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201512-03 (af854a3a-2127-422b-91ae-364da2661108)