CVE-2020-24718 Information

Description

bhyve as used in FreeBSD through 12.1 and illumos (e.g. OmniOS CE through r151034 and OpenIndiana through Hipster 2020.04) does not properly restrict VMCS and VMCB read/write operations as demonstrated by a root user in a container on an Intel system who can gain privileges by modifying VMCS_HOST_RIP.

CVSS Vector

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

Reference

https://github.com/illumos/illumos-gate/blob/84971882a96ac0fecd538b02208054a872ff8af3/usr/src/uts/i86pc/io/vmm/intel/vmcs.cL246-L249 https://security.FreeBSD.org/advisories/FreeBSD-SA-20:28.bhyve_vmcs.asc https://security.netapp.com/advisory/ntap-20201016-0002/

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.2