CVE-2020-10713

MEDIUM

Description

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.

References

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html

http://www.openwall.com/lists/oss-security/2020/07/29/3

https://bugzilla.redhat.com/show_bug.cgi?id=1825243

https://eclypsium.com/2020/07/29/theres-a-hole-in-the-boot/

https://kb.vmware.com/s/article/80181

https://security.netapp.com/advisory/ntap-20200731-0008/

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-grub2-code-exec-xLePCAPY

https://usn.ubuntu.com/4432-1/

https://www.debian.org/security/2020/dsa-4735

https://www.kb.cert.org/vuls/id/174059

Details

Source: MITRE

Published: 2020-07-30

Updated: 2020-08-26

Type: CWE-120

Risk Information

CVSS v2.0

Base Score: 4.6

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

Impact Score: 6.4

Exploitability Score: 3.9

Severity: MEDIUM

CVSS v3.0

Base Score: 8.2

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

Impact Score: 6

Exploitability Score: 1.5

Severity: HIGH