CVE-2021-39131
Improper Handling of Unexpected Data Type in ced
Description
### Impact In ced v0.1.0, passing data types other than `Buffer` causes the Node.js process to crash. ### Patches The problem has been patched in [ced v1.0.0](https://github.com/sonicdoe/ced/releases/tag/v1.0.0). You can upgrade from v0.1.0 without any breaking changes. ### Workarounds Before passing an argument to ced, verify it’s a `Buffer` using [`Buffer.isBuffer(obj)`](https://nodejs.org/api/buffer.html#buffer_static_method_buffer_isbuffer_obj). ### CVSS score [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O/RC:C](https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/RL:O/RC:C) Base Score: 7.5 (High) Temporal Score: 7.2 (High) Since ced is a library, the scoring is based on the “[reasonable worst-case implementation scenario](https://www.first.org/cvss/v3.1/user-guide#3-7-Scoring-Vulnerabilities-in-Software-Libraries-and-Similar)”, namely, accepting data from untrusted sources over a network and passing it directly to ced. Depending on your specific implementation, the vulnerability’s severity in your program may be different. ### Proof of concept ```js const express = require("express"); const bodyParser = require("body-parser"); const ced = require("ced"); const app = express(); app.use(bodyParser.raw()); app.post("/", (req, res) => { const encoding = ced(req.body); res.end(encoding); }); app.listen(3000); ``` `curl --request POST --header "Content-Type: text/plain" --data foo http://localhost:3000` crashes the server. ### References - https://github.com/sonicdoe/ced/commit/a4d9f10b6bf1cd468d1a5b9a283cdf437f8bb7b3
How to fix CVE-2021-39131
To remediate CVE-2021-39131, upgrade the affected package to a fixed version below.
- —upgrade to 1.0.0 or later
Is CVE-2021-39131 being exploited?
Low — EPSS is 0.6%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1.0.0