Vulnerability-Lookup

GHSA-6672-M2HQ-HWM4

Vulnerability from github – Published: 2023-08-02 00:30 – Updated: 2025-02-13 18:31

Details

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.

Severity

8.8 (High)


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

Show details on source website

JSON

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  "affected": [],
  "aliases": [
    "CVE-2023-3494"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-120"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-08-01T23:15:31Z",
    "severity": "HIGH"
  },
  "details": "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\u0027 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.",
  "id": "GHSA-6672-m2hq-hwm4",
  "modified": "2025-02-13T18:31:43Z",
  "published": "2023-08-02T00:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-3494"
    },
    {
      "type": "WEB",
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.asc"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20230831-0006"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2023-3494 (GCVE-0-2023-3494)

Vulnerability from cvelistv5 – Published: 2023-08-01 22:13 – Updated: 2025-02-13 16:55

Title

bhyve privileged guest escape via fwctl

Summary

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-10-21 20:16 UTC

CWE

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Assigner

freebsd mitre root

References

2 references

URL	Tags
https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisory
https://security.netapp.com/advisory/ntap-2023083…

Impacted products

1 product

Vendor	Product	Version
FreeBSD	FreeBSD	Affected: 13.2-RELEASE , < 13.2-RELEASE-p2 (release) Affected: 13.1-RELEASE , < 13.1-RELEASE-p9 (release)

Credits

Omri Ben Bassat and Vladimir Eli Tokarev from Microsoft

Show details on NVD website

JSON

To clipboard

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            "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:07.bhyve.asc"
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      "source": {
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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GHSA-6672-M2HQ-HWM4

CVE-2023-3494 (GCVE-0-2023-3494)

Tags

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Nomenclature

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