CVE-2021-22881
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2:6.0.3.5+dfsg-1 |
| sid | Fixed | 2:6.0.3.5+dfsg-1 |
| forky | Fixed | 2:6.0.3.5+dfsg-1 |
| bullseye | Fixed | 2:6.0.3.5+dfsg-1 |
| bookworm | Fixed | 2:6.0.3.5+dfsg-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| RubyGems | actionpack | !< 6.0.0||<~> 6.0.3, >= 6.0.3.5 | ~> 6.0.3, >= 6.0.3.5 |
| RubyGems | actionpack | >=6.0.0,<6.0.3.5 | 6.0.3.5 |
| RubyGems | actionpack | >=6.1.0,<6.1.2.1 | 6.1.2.1 |
References
- https://groups.google.com/g/rubyonrails-security/c/zN_3qA26l6E
- https://www.suse.com/security/cve/CVE-2021-22881.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-22881
- https://github.com/rails/rails/commit/b5de7b3a4787d8a55aaad39f477c16e3af65e444
- https://hackerone.com/reports/1047447
- 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://github.com/rails/rails
- https://github.com/rails/rails/blob/v6.1.2.1/actionpack/CHANGELOG.md
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-22881.yml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XQ3NS4IBYE2I3MVMGAHFZBZBIZGHXHT3
- https://rubygems.org/gems/actionpack
- 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://security-tracker.debian.org/tracker/CVE-2021-22881
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.