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FreeBSD : FreeBSD -- bhyve privilege escalation via VMCS access (2c5b9cd7-f7e6-11ea-88f8-901b0ef719ab)

high Nessus Plugin ID 140626

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

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

Update the affected packages.

See Also

http://www.nessus.org/u?b5cf029f

Plugin Details

Severity: High

ID: 140626

File Name: freebsd_pkg_2c5b9cd7f7e611ea88f8901b0ef719ab.nasl

Version: 1.4

Type: local

Published: 9/17/2020

Updated: 2/20/2024

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2020-24718

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:freebsd, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info, Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/16/2020

Vulnerability Publication Date: 9/15/2020

Reference Information

CVE: CVE-2020-24718

FreeBSD: SA-20:28.bhyve_vmcs