CVE-2021-27861
Vulnerability from cvelistv5
Published
2022-09-27 18:40
Modified
2024-09-16 16:47
Severity ?
Summary
L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths
Impacted products
Vendor Product Version
IETF draft-ietf-v6ops-ra-guard Version: 08   <
IETF P802.1Q Version: D1.0   <
Show details on NVD website


{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T21:33:17.074Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://standards.ieee.org/ieee/802.2/1048/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://kb.cert.org/vuls/id/855201"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "802.2",
          "vendor": "IEEE",
          "versions": [
            {
              "lessThanOrEqual": "802.2h-1997",
              "status": "affected",
              "version": "802.2h-1997",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "draft-ietf-v6ops-ra-guard",
          "vendor": "IETF",
          "versions": [
            {
              "lessThanOrEqual": "08",
              "status": "affected",
              "version": "08",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "P802.1Q",
          "vendor": "IETF",
          "versions": [
            {
              "lessThanOrEqual": "D1.0",
              "status": "affected",
              "version": "D1.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Etienne Champetier (@champtar) \u003cchampetier.etienne@gmail.com\u003e"
        }
      ],
      "datePublic": "2022-09-27T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-130",
              "description": "CWE-130 Improper Handling of Length Parameter",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-10-12T00:00:00",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
        },
        {
          "url": "https://standards.ieee.org/ieee/802.2/1048/"
        },
        {
          "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
        },
        {
          "url": "https://kb.cert.org/vuls/id/855201"
        },
        {
          "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2021-27861",
    "datePublished": "2022-09-27T18:40:13.742316Z",
    "dateReserved": "2021-03-01T00:00:00",
    "dateUpdated": "2024-09-16T16:47:46.467Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-27861\",\"sourceIdentifier\":\"cret@cert.org\",\"published\":\"2022-09-27T19:15:09.330\",\"lastModified\":\"2022-10-12T13:15:10.550\",\"vulnStatus\":\"Modified\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)\"},{\"lang\":\"es\",\"value\":\"Las capacidades de filtrado de red de capa 2, como la protecci\u00f3n RA de IPv6, pueden omitirse usando encabezados LLC/SNAP con una longitud no v\u00e1lida (y, opcionalmente, encabezados VLAN0)\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\",\"baseScore\":4.7,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":2.8,\"impactScore\":1.4}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-290\"}]},{\"source\":\"cret@cert.org\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-130\"},{\"lang\":\"en\",\"value\":\"CWE-290\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"802.2h-1997\",\"matchCriteriaId\":\"D5B0DDC2-21C5-4682-9AA2-055BF7C722DA\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"d1.0\",\"matchCriteriaId\":\"94105D2E-950F-4290-8840-301FA908BC8C\"}]}]}],\"references\":[{\"url\":\"https://blog.champtar.fr/VLAN0_LLC_SNAP/\",\"source\":\"cret@cert.org\"},{\"url\":\"https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/\",\"source\":\"cret@cert.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://kb.cert.org/vuls/id/855201\",\"source\":\"cret@cert.org\"},{\"url\":\"https://standards.ieee.org/ieee/802.1Q/10323/\",\"source\":\"cret@cert.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://standards.ieee.org/ieee/802.2/1048/\",\"source\":\"cret@cert.org\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.