---
cve: "CVE-2015-8370"
severity: "HIGH"
cvss: 7.4
epss: "1.1%"
vendor: "n/a"
kev: false
exploited: false
published: "2015-12-16 21:59:04"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-18T05:37:37+02:00"
---

# CVE-2015-8370

> 7.4 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Lokal | good |
| AC Komplexität | Hoch | good |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Referenzen

- <http://packetstormsecurity.com/files/134831/Grub2-Authentication-Bypass.html>
- <http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00043.html>
- <http://lists.opensuse.org/opensuse-security-announce/2016-01/msg00003.html>
- <http://hmarco.org/bugs/CVE-2015-8370-Grub2-authentication-bypass.html>
- <http://www.securityfocus.com/bid/79358>
- <http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00037.html>
- <http://www.securitytracker.com/id/1034422>
- <http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html>
- <http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00041.html>
- <http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00040.html>
- <http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html>
- <http://www.openwall.com/lists/oss-security/2015/12/15/6>
- <http://www.securityfocus.com/archive/1/537115/100/0/threaded>
- <http://lists.opensuse.org/opensuse-security-announce/2015-12/msg00039.html>
- <http://seclists.org/fulldisclosure/2015/Dec/69>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2015-8370) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_