CRLF Injection in Nodejs ‘undici’ via Content-Type

CVE-2022-35948

What is CVE-2022-35948?

undici is an HTTP/1.1 client, written from scratch for Node.js.=< [email protected] users are vulnerable to CRLF Injection on headers when using unsanitized input as request headers, more specifically, inside the content-type header. Example: import { request } from 'undici' const unsanitizedContentTypeInput = 'application/json\r\n\r\nGET /foo2 HTTP/1.1' await request('http://localhost:3000, { method: 'GET', headers: { 'content-type': unsanitizedContentTypeInput }, }) The above snippet will perform two requests in a single request API call: 1) http://localhost:3000/ 2) http://localhost:3000/foo2 This issue was patched in Undici v5.8.1. Sanitize input when sending content-type headers using user input as a workaround.

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