CVE-2021-22881
First published: Thu Feb 11 2021(Updated: )
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.
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Rubyonrails Rails | >=6.0.0<6.0.3.5 | |
| Rubyonrails Rails | >=6.1.0<6.1.2.1 | |
| Fedoraproject Fedora | =33 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2021/05/05/2
- http://www.openwall.com/lists/oss-security/2021/08/20/1
- http://www.openwall.com/lists/oss-security/2021/12/14/5
- https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/
- https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130
- https://hackerone.com/reports/1047447
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/
Frequently Asked Questions
What is CVE-2021-22881?
CVE-2021-22881 is an open redirect vulnerability in the Host Authorization middleware in Ruby on Rails before version 6.1.2.1 and 6.0.3.5.
What is the severity of CVE-2021-22881?
CVE-2021-22881 has a severity rating of 6.1, which is considered medium.
Which software versions are affected by CVE-2021-22881?
Ruby on Rails versions before 6.1.2.1 and 6.0.3.5 are affected by CVE-2021-22881.
How does CVE-2021-22881 work?
CVE-2021-22881 can be exploited by sending specially crafted `Host` headers to the vulnerable application, which can lead to an open redirect and redirect users to a malicious website.
Is there a fix available for CVE-2021-22881?
Yes, upgrading to Ruby on Rails version 6.1.2.1 or 6.0.3.5 will fix the vulnerability.
- collector/nvd-index
- vendor/rubyonrails
- product/rails
- canonical/rubyonrails rails
- vendor/fedoraproject
- product/fedora
- canonical/fedoraproject fedora