CVE-2024-47220

A flaw was found in the webrick toolkit. This issue occurs because the server incorrectly handles requests with both Content-Length and Transfer-Encoding headers. This can allow an attacker to sneak in an extra request such as GET /admin after the normal request POST /user. As a result, unauthorized users can access restricted areas like /admin by POST /user.

This CVE is rated as having Moderate impact because Webrick should not be used in production. It is only still maintained because there are other gems relying on it, most of which do so only for testing, and only because it is a pure ruby implementation and it was shipped with Ruby in the past.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

As a temporary workaround, avoid using WEBrick in production environments. If you must use it, ensure that your application is behind a reverse proxy that can handle request validation and filtering to mitigate the risk of HTTP request smuggling.