{
"id": "GHSA-m697-4v8f-55qg",
"aliases": [
"CVE-2021-32813"
],
"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",
"summary": "Header dropping in traefik",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.13"
}
]
}
],
"package": {
"name": "github.com/traefik/traefik/v2",
"ecosystem": "Go"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"last_affected": "1.7.30"
}
]
}
],
"package": {
"name": "github.com/traefik/traefik",
"ecosystem": "Go"
}
}
],
"modified": "2021-08-31T20:57:09Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N"
}
],
"published": "2021-08-05T17:04:21Z",
"references": [
{
"url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32813",
"type": "ADVISORY"
},
{
"url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9",
"type": "WEB"
},
{
"url": "https://github.com/traefik/traefik/releases/tag/v2.4.13",
"type": "WEB"
},
{
"url": "github.com/traefik/traefik",
"type": "PACKAGE"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-913"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2021-08-03T23:15:00Z",
"github_reviewed_at": "2021-08-04T18:54:19Z"
}
}