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ubuntucveUbuntu.comUB:CVE-2020-10713
HistoryJul 29, 2020 - 12:00 a.m.

CVE-2020-10713

2020-07-2900:00:00
ubuntu.com
ubuntu.com
13

8.2 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

28.2%

A flaw was found in grub2, prior to version 2.06. An attacker may use the
GRUB 2 flaw to hijack and tamper the GRUB verification process. This flaw
also allows the bypass of Secure Boot protections. In order to load an
untrusted or modified kernel, an attacker would first need to establish
access to the system such as gaining physical access, obtain the ability to
alter a pxe-boot network, or have remote access to a networked system with
root access. With this access, an attacker could then craft a string to
cause a buffer overflow by injecting a malicious payload that leads to
arbitrary code execution within GRUB. The highest threat from this
vulnerability is to data confidentiality and integrity as well as system
availability.

Notes

Author Note
alexmurray grub2-signed is not supported in Ubuntu 12.04 ESM (precise/esm) and so marking the priority for grub2 in this release as low
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchgrub2< 2.02-2ubuntu8.16UNKNOWN
ubuntu20.04noarchgrub2< 2.04-1ubuntu26.1UNKNOWN
ubuntu14.04noarchgrub2< 2.02~beta2-9ubuntu1.20) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchgrub2< 2.02~beta2-36ubuntu3.26UNKNOWN
ubuntu20.04noarchgrub2-signed< 1.142.3UNKNOWN
ubuntu18.04noarchgrub2-signed< 1.93.18UNKNOWN
ubuntu14.04noarchgrub2-signed< 1.34.22) Available with Ubuntu Pro or Ubuntu Pro (Infra-onlyUNKNOWN
ubuntu16.04noarchgrub2-signed< 1.66.26UNKNOWN
ubuntu16.04noarchgrub2-unsigned< anyUNKNOWN
ubuntu18.04noarchgrub2-unsigned< 2.04-1ubuntu47.4UNKNOWN
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8.2 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

4.6 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

0.001 Low

EPSS

Percentile

28.2%