CVE-2021-39157

detect-character-encoding is an open source character encoding inspection library. In detect-character-encoding v0.6.0 and earlier, data matching no charset causes the Node.js process to crash. The problem has been patched in [detect-character-encoding v0.7.0](https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0). No workaround are available and all users should update to resolve this issue.

detect-character-encoding is an open source character encoding inspection library. In detect-character-encoding v0.6.0 and earlier, data matching no charset causes the Node.js process to crash. The problem has been patched in [detect-character-encoding v0.7.0](https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0). No workaround are available and all users should update to resolve this issue.

### Impact In detect-character-encoding v0.6.0 and earlier, data matching no charset causes the Node.js process to crash. ### Patches The problem has been patched in [detect-character-encoding v0.7.0](https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0). ### 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 detect-character-encoding 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 detect-character-encoding. 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 detectCharacterEncoding = require("detect-character-encoding"); const app = express(); app.use(bodyParser.raw()); app.post("/", (req, res) => { const charsetMatch = detectCharacterEncoding(req.body); res.end(charsetMatch.encoding); }); app.listen(3000); ``` `printf "\xAA" | curl --request POST --header "Content-Type: application/octet-stream" --data-binary @- http://localhost:3000` crashes the server.

### Impact In detect-character-encoding v0.6.0 and earlier, data matching no charset causes the Node.js process to crash. ### Patches The problem has been patched in [detect-character-encoding v0.7.0](https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0). ### 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 detect-character-encoding 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 detect-character-encoding. 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 detectCharacterEncoding = require("detect-character-encoding"); const app = express(); app.use(bodyParser.raw()); app.post("/", (req, res) => { const charsetMatch = detectCharacterEncoding(req.body); res.end(charsetMatch.encoding); }); app.listen(3000); ``` `printf "\xAA" | curl --request POST --header "Content-Type: application/octet-stream" --data-binary @- http://localhost:3000` crashes the server.

detect-character-encoding, es una biblioteca de inspección de codificación de caracteres de código abierto. En detect-character-encoding versiones v0.6.0 y anteriores, los datos que no coinciden con ningún conjunto de caracteres causan que el proceso Node.js se bloquee. El problema ha sido parcheado en [detect-character-encoding v0.7.0](https://github.com/sonicdoe/detect-character-encoding/releases/tag/v0.7.0). No se presentan soluciones disponibles y todos los usuarios deberían actualizar para resolver este problema.