CVE-2021-22881

Published: 11 February 2021

The Host Authorization middleware in Action Pack before 6.1.2.1, 6.0.3.5 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.

Notes

In Oneiric-Saucy, rails package is just for transition;
The rails package contains actual code from vivid onward

Status

Severity score breakdown

References

• https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130
• https://hackerone.com/reports/1047447
• https://www.cve.org/CVERecord?id=CVE-2021-22881
• NVD
• Launchpad
• Debian