CVE-2015-8370

Publication date 11 December 2015

Last updated 30 May 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.4 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
grub2 15.10 wily
Fixed 2.02~beta2-29ubuntu0.2
15.04 vivid
Fixed 2.02~beta2-22ubuntu1.4
14.04 LTS trusty
Fixed 2.02~beta2-9ubuntu1.6
12.04 LTS precise
Fixed 1.99-21ubuntu3.19

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
grub2

Severity score breakdown

Parameter Value
Base score 7.4 · High
Attack vector Local
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H