CVE-2021-22903 – The actionpack ruby gem before 6.1.3.2 suffers from a possible open redirect vulnerability …

Vuln ID: CVE-2021-22903

Published:  2021-06-11  16:15:11Z

Description: The actionpack ruby gem before 6.1.3.2 suffers from a possible open redirect vulnerability. Specially crafted Host headers in combination with certain "allowed host" formats can cause the Host Authorization middleware in Action Pack to redirect users to a malicious website. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts << "sub.example.com"` to permit a request with a Host header value of `sub-example.com`.

Source: NVD.NIST.GOV