CVE-2021-22881: URL Redirection to Untrusted Site (Open Redirect)

February 11, 2021 (updated November 7, 2023)

The Host Authorization middleware in Action Pack suffers from an 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. Impacted applications will have allowed hosts with a leading dot. When an allowed host contains a leading dot, a specially crafted Host header can be used to redirect to a malicious website.

References

discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130
nvd.nist.gov/vuln/detail/CVE-2021-22881

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