gsd-2021-27861
Vulnerability from gsd
Modified
2023-12-13 01:23
Details
Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)
Aliases
Aliases
CVE-2021-27861


To clipboard 

{
  "GSD": {
    "alias": "CVE-2021-27861",
    "id": "GSD-2021-27861",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-27861.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-27861"
      ],
      "details": "Layer 2 network filtering capabilities such as IPv6 RA guard can be bypassed using LLC/SNAP headers with invalid length (and optionally VLAN0 headers)",
      "id": "GSD-2021-27861",
      "modified": "2023-12-13T01:23:36.008885Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cert@cert.org",
        "DATE_PUBLIC": "2022-09-27T01:00:00.000Z",
        "ID": "CVE-2021-27861",
        "STATE": "PUBLIC",
        "TITLE": "L2 network filtering bypass using stacked VLAN0 and LLC/SNAP headers with invalid lengths"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "802.2",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "802.2h-1997",
                          "version_value": "802.2h-1997"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "IEEE"
            },
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "draft-ietf-v6ops-ra-guard",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "08",
                          "version_value": "08"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "IETF"
            },
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "P802.1Q",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c=",
                          "version_name": "D1.0",
                          "version_value": "D1.0"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "IETF"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Etienne Champetier (@champtar) \u003cchampetier.etienne@gmail.com\u003e "
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "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)"
          }
        ]
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-130 Improper Handling of Length Parameter"
              }
            ]
          },
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-290: Authentication Bypass by Spoofing"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/",
            "refsource": "MISC",
            "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
          },
          {
            "name": "https://standards.ieee.org/ieee/802.2/1048/",
            "refsource": "MISC",
            "url": "https://standards.ieee.org/ieee/802.2/1048/"
          },
          {
            "name": "https://standards.ieee.org/ieee/802.1Q/10323/",
            "refsource": "MISC",
            "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
          },
          {
            "name": "https://kb.cert.org/vuls/id/855201",
            "refsource": "MISC",
            "url": "https://kb.cert.org/vuls/id/855201"
          },
          {
            "name": "https://blog.champtar.fr/VLAN0_LLC_SNAP/",
            "refsource": "MISC",
            "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
          }
        ]
      },
      "source": {
        "discovery": "EXTERNAL"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:ieee:ieee_802.2:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "802.2h-1997",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          },
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:ietf:p802.1q:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "d1.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "cert@cert.org",
          "ID": "CVE-2021-27861"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "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)"
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-290"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "N/A",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://standards.ieee.org/ieee/802.2/1048/"
            },
            {
              "name": "N/A",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://datatracker.ietf.org/doc/draft-ietf-v6ops-ra-guard/08/"
            },
            {
              "name": "N/A",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://standards.ieee.org/ieee/802.1Q/10323/"
            },
            {
              "name": "https://kb.cert.org/vuls/id/855201",
              "refsource": "MISC",
              "tags": [],
              "url": "https://kb.cert.org/vuls/id/855201"
            },
            {
              "name": "https://blog.champtar.fr/VLAN0_LLC_SNAP/",
              "refsource": "MISC",
              "tags": [],
              "url": "https://blog.champtar.fr/VLAN0_LLC_SNAP/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 1.4
        }
      },
      "lastModifiedDate": "2022-10-12T13:15Z",
      "publishedDate": "2022-09-27T19:15Z"
    }
  }
}


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