ghsa-m697-4v8f-55qg
Vulnerability from github
Published
2021-08-05 17:04
Modified
2021-08-31 20:57
Severity ?
4.8 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Summary
Header dropping in traefik
Details

Impact

There exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse.

Details

If you have a chain of Traefik middlewares, and one of them sets a request header Important-Security-Header, then sending a request with the following Connection header will cause it to be removed before the request was sent:

curl 'https://example.com' -H "Connection: Important-Security-Header" -0

In this case, the backend does not see the request header Important-Security-Header.

Patches

Traefik v2.4.x: https://github.com/traefik/traefik/releases/tag/v2.4.13

Workarounds

No.

For more information

If you have any questions or comments about this advisory, open an issue.

Show details on source website

To clipboard 

{
   affected: [
      {
         package: {
            ecosystem: "Go",
            name: "github.com/traefik/traefik/v2",
         },
         ranges: [
            {
               events: [
                  {
                     introduced: "0",
                  },
                  {
                     fixed: "2.4.13",
                  },
               ],
               type: "ECOSYSTEM",
            },
         ],
      },
      {
         package: {
            ecosystem: "Go",
            name: "github.com/traefik/traefik",
         },
         ranges: [
            {
               events: [
                  {
                     introduced: "0",
                  },
                  {
                     last_affected: "1.7.30",
                  },
               ],
               type: "ECOSYSTEM",
            },
         ],
      },
   ],
   aliases: [
      "CVE-2021-32813",
   ],
   database_specific: {
      cwe_ids: [
         "CWE-913",
      ],
      github_reviewed: true,
      github_reviewed_at: "2021-08-04T18:54:19Z",
      nvd_published_at: "2021-08-03T23:15:00Z",
      severity: "MODERATE",
   },
   details: "# Impact\n\nThere exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse.\n\n# Details\n\nIf you have a chain of Traefik middlewares, and one of them sets a request header `Important-Security-Header`, then sending a request with the following Connection header will cause it to be removed before the request was sent:\n\n```\ncurl 'https://example.com' -H \"Connection: Important-Security-Header\" -0\n```\n\nIn this case, the backend does not see the request header `Important-Security-Header`.\n\n# Patches\n\nTraefik v2.4.x: https://github.com/traefik/traefik/releases/tag/v2.4.13\n\n# Workarounds\n\nNo.\n\n# For more information\n\nIf you have any questions or comments about this advisory, [open an issue](https://github.com/traefik/traefik/issues).\n",
   id: "GHSA-m697-4v8f-55qg",
   modified: "2021-08-31T20:57:09Z",
   published: "2021-08-05T17:04:21Z",
   references: [
      {
         type: "WEB",
         url: "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg",
      },
      {
         type: "ADVISORY",
         url: "https://nvd.nist.gov/vuln/detail/CVE-2021-32813",
      },
      {
         type: "WEB",
         url: "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9",
      },
      {
         type: "WEB",
         url: "https://github.com/traefik/traefik/releases/tag/v2.4.13",
      },
      {
         type: "PACKAGE",
         url: "github.com/traefik/traefik",
      },
   ],
   schema_version: "1.4.0",
   severity: [
      {
         score: "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N",
         type: "CVSS_V3",
      },
   ],
   summary: "Header dropping in traefik",
}


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