CVE-2021-22903
First published: Wed May 05 2021(Updated: )
The actionpack ruby gem before 6.1.3.2 suffers from a possible 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. This is similar to CVE-2021-22881. Strings in config.hosts that do not have a leading dot are converted to regular expressions without proper escaping. This causes, for example, `config.hosts << "sub.example.com"` to permit a request with a Host header value of `sub-example.com`.
Credit: support@hackerone.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| rubygems/actionpack | >=6.1.0.rc2<6.1.3.2 | 6.1.3.2 |
| Ruby on Rails | >=6.1.1<6.1.3.2 | |
| Ruby on Rails | =6.1.0-rc2 |
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Reference Links
- https://github.com/rails/rails/releases/tag/v6.1.3.2
- https://groups.google.com/g/rubyonrails-security/c/8TxqXEtgSF0
- https://nvd.nist.gov/vuln/detail/CVE-2021-22903
- https://hackerone.com/reports/1148025
- https://discuss.rubyonrails.org/t/cve-2021-22903-possible-open-redirect-vulnerability-in-action-pack/77867
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-22903.yml
- https://github.com/advisories/GHSA-5hq2-xf89-9jxq (Advisory)
Frequently Asked Questions
What is CVE-2021-22903?
CVE-2021-22903 is a possible open redirect vulnerability in Action Pack, a Ruby gem used in Ruby on Rails applications.
What versions of Action Pack are affected by CVE-2021-22903?
Action Pack versions >= v6.1.0.rc2 are affected by CVE-2021-22903.
How can I fix CVE-2021-22903?
To fix CVE-2021-22903, you should upgrade to Action Pack version 6.1.3.2 or later.
What is the impact of CVE-2021-22903?
CVE-2021-22903 allows for possible open redirects, potentially leading to phishing attacks or unauthorized access to sensitive information.
Where can I find more information about CVE-2021-22903?
You can find more information about CVE-2021-22903 on the GitHub release page, the Ruby on Rails security group on Google Groups, and the NVD (National Vulnerability Database) website.
- collector/github-advisory-latest
- alias/GHSA-5hq2-xf89-9jxq
- alias/CVE-2021-22903
- collector/github-advisory
- agent/weakness
- agent/references
- agent/severity
- agent/author
- agent/type
- agent/event
- agent/description
- agent/remedy
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- collector/nvd-cve
- agent/software-canonical-lookup-request
- collector/nvd-index
- package-manager/rubygems
- vendor/rubyonrails
- canonical/ruby on rails
- version/ruby on rails/6.1.1
- version/ruby on rails/6.1.0-rc2