CVE-2021-22881

MEDIUM NUCLEI

Action Pack <6.1.2.1, 6.0.3.5 - Open Redirect

Title source: llm

Description

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.

Nuclei Templates (1)

Ruby on Rails - Open Redirect via Host Header Injection

MEDIUMby theamanrawat

References (7)

[Mailing List, Mitigation, Third Party Advisory] http://www.openwall.com/lists/oss-security/2021/05/05/2

[Mailing List, Mitigation, Third Party Advisory] http://www.openwall.com/lists/oss-security/2021/08/20/1

[Exploit, Mailing List, Patch] http://www.openwall.com/lists/oss-security/2021/12/14/5

[Patch, Third Party Advisory] https://benjamin-bouchet.com/cve-2021-22881-faille-de-securite-dans-le-middleware-hostauthorization/

[Mitigation, Patch, Vendor Advisory] https://discuss.rubyonrails.org/t/cve-2021-22881-possible-open-redirect-in-host-authorization-middleware/77130

[Exploit, Patch, Third Party Advisory] https://hackerone.com/reports/1047447

[Mailing List, Third Party Advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3/

Scores

CVSS v3 6.1

EPSS 0.1545

EPSS Percentile 94.7%

Attack Vector NETWORK

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

Details

CWE

CWE-601

Status published

Products (3)

fedoraproject/fedora 33

rubygems/actionpack 6.0.0 - 6.0.3.5RubyGems

rubyonrails/rails 6.0.0 - 6.0.3.5

Published Feb 11, 2021

Tracked Since Feb 18, 2026