GHSA-jp5v-5gx4-jmj9
Ability to forge per-form CSRF tokens in Rails
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | actionpack | >= 5.0.0, < 5.2.4.3 | 5.2.4.3 |
| RubyGems | actionpack | >= 6.0.0, < 6.0.3.1 | 6.0.3.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
It is possible to, given a global CSRF token such as the one present in the authenticity_token meta tag, forge a per-form CSRF token for any action for that session.
Impact
------
Given the ability to extract the global CSRF token, an attacker would be able to construct a per-form CSRF token for that session.
Workarounds
-----------
This is a low-severity security issue. As such, no workaround is necessarily until such time as the application can be upgraded.
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2020-8166
- https://hackerone.com/reports/732415
- https://github.com/rails/rails
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2020-8166.yml
- https://groups.google.com/forum/#!topic/rubyonrails-security/NOjKiGeXUgw
- https://groups.google.com/g/rubyonrails-security/c/NOjKiGeXUgw
- https://www.debian.org/security/2020/dsa-4766