CVE-2015-8370

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Summary

CVECVE-2015-8370
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2015-12-16 21:59:04 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionMultiple 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.

Risk And Classification

Primary CVSS: v3.1 7.4 HIGH from ADP

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

Problem Types: CWE-264 | CWE-191 | n/a | CWE-191 CWE-191 Integer Underflow (Wrap or Wraparound)

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.9AV:L/AC:M/Au:N/C:C/I:C/A:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Fedoraproject Fedora 23 All All All
Application Gnu Grub2 1.98 All All All
Application Gnu Grub2 1.99 All All All
Application Gnu Grub2 2.00 All All All
Application Gnu Grub2 2.01 All All All
Application Gnu Grub2 2.02 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
GRUB: Authentication bypass (GLSA 201512-03) — Gentoo Security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
[SECURITY] Fedora 23 Update: grub2-2.02-0.25.fc23 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[security-announce] SUSE-SU-2015:2386-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Debian -- Security Information -- DSA-3421-1 grub2 af854a3a-2127-422b-91ae-364da2661108 www.debian.org
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 rhn.redhat.com
[security-announce] SUSE-SU-2015:2399-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
[security-announce] SUSE-SU-2015:2385-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Back to 28: Grub2 Authentication Bypass 0-Day af854a3a-2127-422b-91ae-364da2661108 hmarco.org Exploit
oss-security - Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370] af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
GNU GRUB2 CVE-2015-8370 Multiple Local Authentication Bypass Vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
[SECURITY] Fedora 22 Update: grub2-2.02-0.18.fc22 af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
GNU GRUB Authentication Bug Lets Local Users Bypass Authentication and Gain Elevated Privileges - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
[security-announce] openSUSE-SU-2015:2375-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Oracle Critical Patch Update - January 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch
Grub2 Authentication Bypass ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
[security-announce] openSUSE-SU-2016:0036-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
[security-announce] openSUSE-SU-2015:2392-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
oss-security - CVE-2023-4001: a password bypass vulnerability in the downstream GRUB boot manager af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
Oracle Linux Bulletin - October 2015 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
[security-announce] SUSE-SU-2015:2387-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
Full Disclosure: Back to 28: Grub2 Authentication Bypass 0-Day [CVE-2015-8370] af854a3a-2127-422b-91ae-364da2661108 seclists.org
USN-2836-1: GRUB vulnerability | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 900175 CBL-Mariner Linux Security Update for grub2 2.02
  • 903246 Common Base Linux Mariner (CBL-Mariner) Security Update for grub2 (1824)
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