CVE-2021-22881

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.

Affected

https://github.com/rails/rails

CVSS v3.1 NVD

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v2.0 NVD

5.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:N

EPSS

87.30% chance of exploitation in the next 30 days, 100th percentile

Nuclei

medium · CWE-601

Published

2021-02-11

Updated

2024-08-03

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-22881.yaml

Security advisories

• https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authoriza…
• http://www.openwall.com/lists/oss-security/2021/05/05/2
• http://www.openwall.com/lists/oss-security/2021/08/20/1
• https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostaut…
• https://hackerone.com/reports/1047447
• advisories/GHSA-8877-prq4-9xfw
• http://www.openwall.com/lists/oss-security/2021/12/14/5

References

• CVE Record
• NVD entry