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: "<=",
                                       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: "<=",
                                       version_name: "08",
                                       version_value: "08",
                                    },
                                 ],
                              },
                           },
                        ],
                     },
                     vendor_name: "IETF",
                  },
                  {
                     product: {
                        product_data: [
                           {
                              product_name: "P802.1Q",
                              version: {
                                 version_data: [
                                    {
                                       version_affected: "<=",
                                       version_name: "D1.0",
                                       version_value: "D1.0",
                                    },
                                 ],
                              },
                           },
                        ],
                     },
                     vendor_name: "IETF",
                  },
               ],
            },
         },
         credit: [
            {
               lang: "eng",
               value: "Etienne Champetier (@champtar) <champetier.etienne@gmail.com> ",
            },
         ],
         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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