CVE-2023-3494

Published Aug 1, 2023

Last updated a year ago

CVSS high 8.8

Overview

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.
Source: secteam@freebsd.org
NVD status: Modified

Risk scores

CVSS 3.1

Type: Primary
Base score: 8.8
Impact score: 6
Exploitability score: 2
Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity: HIGH

Weaknesses

nvd@nist.gov: CWE-120
secteam@freebsd.org: CWE-120

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:-:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "DEEE6D52-27E4-438D-AE8D-7141320B5973"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:b1-p1:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "66364EA4-83B1-4597-8C18-D5633B361A9C"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:b2-p2:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "EF9292DD-EFB1-4B50-A941-7485D901489F"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p1:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "EFB18F55-4F5C-4166-9A7E-6F6617179A90"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p2:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "66E1C269-841F-489A-9A0A-5D145B417E0A"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p3:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "ECF1B567-F764-45F5-A793-BEA93720F952"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p4:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "DAFE3F33-2C57-4B52-B658-82572607BD8C"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p5:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "C925DF75-2785-44BD-91CA-66D29C296689"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p6:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "BCE2DAEC-81A5-49E9-B7E7-4F143FA6B3F7"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p7:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "7725D503-1437-4F90-B30C-007193D5F0E1"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:p8:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "49CDE3D8-2924-42B9-8778-C5A517F5451E"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.1:rc1-p1:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "B536EE52-ED49-4A85-BC9D-A27828D5A961"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.2:-:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "A87EFA20-DD6B-41C5-98FD-A29F67D2E732"
          },
          {
            "criteria": "cpe:2.3:o:freebsd:freebsd:13.2:p1:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "2888B0C1-4D85-42EC-9696-03FAD0A9C28F"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

References