8.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.9 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%
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.
CPE | Name | Operator | Version |
---|---|---|---|
freebsd:freebsd | freebsd | eq | 13.1 |
freebsd:freebsd | freebsd | eq | 13.2 |
[
{
"defaultStatus": "unaffected",
"modules": [
"bhyve"
],
"product": "FreeBSD",
"vendor": "FreeBSD",
"versions": [
{
"lessThan": "13.2-RELEASE-p2",
"status": "affected",
"version": "13.2-RELEASE",
"versionType": "release"
},
{
"lessThan": "13.1-RELEASE-p9",
"status": "affected",
"version": "13.1-RELEASE",
"versionType": "release"
}
]
}
]
8.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.9 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%