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FreeBSD: VID-2C5B9CD7-F7E6-11EA-88F8-901B0EF719AB (CVE-2020-24718): FreeBSD -- bhyve privilege escalation via VMCS access

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FreeBSD: VID-2C5B9CD7-F7E6-11EA-88F8-901B0EF719AB (CVE-2020-24718): FreeBSD -- bhyve privilege escalation via VMCS access

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
09/15/2020
Created
09/19/2020
Added
09/17/2020
Modified
10/20/2020

Description

Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.

From VID-2C5B9CD7-F7E6-11EA-88F8-901B0EF719AB:

Problem Description:

AMD and Intel CPUs support hardware virtualization using specialized data

structures that control various aspects of guest operation. These are the

Virtual Machine Control Structure (VMCS) on Intel CPUs, and the Virtual

Machine Control Block (VMCB) on AMD CPUs. Insufficient access controls allow

root users, including those running in a jail, to change these data

structures.

Impact:

An attacker with host root access (including to a jailed bhyve instance) can

use this vulnerability to achieve kernel code execution.

Solution(s)

  • freebsd-upgrade-base-11_3-release-p14
  • freebsd-upgrade-base-11_4-release-p4
  • freebsd-upgrade-base-12_1-release-p10

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