Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2023-3494

Severity CVSS v4.0:
Pending analysis
Type:
CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Publication date:
01/08/2023
Last modified:
13/02/2025

Description

The fwctl driver implements a state machine which is executed when a bhyve guest accesses certain x86 I/O ports. The interface lets the guest copy a string into a buffer resident in the bhyve process' memory. A bug in the state machine implementation can result in a buffer overflowing when copying this string. Malicious, privileged software running in a guest VM can exploit the buffer overflow to achieve code execution on the host in the bhyve userspace process, which typically runs as root, mitigated by the capabilities assigned through the Capsicum sandbox available to the bhyve process.

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 8.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
8.80
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:freebsd:freebsd:13.1:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:b1-p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:b2-p2:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p2:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p3:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p4:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p5:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p6:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p7:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:p8:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.1:rc1-p1:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.2:-:*:*:*:*:*:*
cpe:2.3:o:freebsd:freebsd:13.2:p1:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools