GHSA-35mm-cc6r-8fjp
Cross-site scripting in actionpack
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| RubyGems | actionpack | >= 6.0.0, < 6.0.3.4 | 6.0.3.4 |
Details
As written in the advisory (Markdown source, shown as plain text).
In actionpack gem >= 6.0.0, a possible XSS vulnerability exists when an application is running in development mode allowing an attacker to send or embed (in another page) a specially crafted URL which can allow the attacker to execute JavaScript in the context of the local application. This vulnerability is in the Actionable Exceptions middleware.
Workarounds
-----------
Until such time as the patch can be applied, application developers should disable the Actionable Exceptions middleware in their development environment via a line such as this one in their config/environment/development.rb: `config.middleware.delete ActionDispatch::ActionableExceptions`
References
External links from the advisory. They lead to third-party sites.
- https://nvd.nist.gov/vuln/detail/CVE-2020-8264
- https://hackerone.com/reports/904059
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2020-8264.yml
- https://groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk
- https://groups.google.com/g/rubyonrails-security/c/yQzUVfv42jk/m/oJWw-xhNAQAJ