Vulnerability-Lookup

GHSA-G6HH-X63C-83GF

Vulnerability from github – Published: 2023-09-06 21:32 – Updated: 2025-02-13 18:31

Details

In pf packet processing with a 'scrub fragment reassemble' rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed. That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is.

As a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.

Severity

7.5 (High)


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

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  "affected": [],
  "aliases": [
    "CVE-2023-4809"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-167"
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    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2023-09-06T20:15:08Z",
    "severity": "HIGH"
  },
  "details": "In pf packet processing with a \u0027scrub fragment reassemble\u0027 rule, a packet containing multiple IPv6 fragment headers would be reassembled, and then immediately processed.  That is, a packet with multiple fragment extension headers would not be recognized as the correct ultimate payload. Instead a packet with multiple IPv6 fragment headers would unexpectedly be interpreted as a fragmented packet, rather than as whatever the real payload is.\n\n\n\n\nAs a result, IPv6 fragments may bypass pf firewall rules written on the assumption all fragments have been reassembled and, as a result, be forwarded or processed by the host.",
  "id": "GHSA-g6hh-x63c-83gf",
  "modified": "2025-02-13T18:31:51Z",
  "published": "2023-09-06T21:32:50Z",
  "references": [
    {
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      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4809"
    },
    {
      "type": "WEB",
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-23:10.pf.asc"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20231221-0009"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/5"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/6"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2023/09/08/7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2023-4809 (GCVE-0-2023-4809)

Vulnerability from cvelistv5 – Published: 2023-09-06 19:26 – Updated: 2025-02-13 17:18

Title

pf incorrectly handles multiple IPv6 fragment headers

Summary

Severity

No CVSS data available.

CWE

CWE-167 - Improper Handling of Additional Special Element

Assigner

freebsd mitre root

References

5 references

URL	Tags
https://security.FreeBSD.org/advisories/FreeBSD-S…	vendor-advisory
http://www.openwall.com/lists/oss-security/2023/09/08/5
http://www.openwall.com/lists/oss-security/2023/09/08/6
http://www.openwall.com/lists/oss-security/2023/09/08/7
https://security.netapp.com/advisory/ntap-2023122…

Impacted products

1 product

Vendor	Product	Version
FreeBSD	FreeBSD	Affected: 13.2-RELEASE , < p3 (release) Affected: 12.4-RELEASE , < p5 (release)

Credits

Enrico Bassetti bassetti@di.uniroma1.it (NetSecurityLab @ Sapienza University of Rome)

Show details on NVD website

JSON

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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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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.