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GHSA-242p-4v39-2v8g

Cross-site Scripting (XSS) possible with maliciously formed HTML attribute names and values in Phlex

Source: GitHub Advisory Database (reviewed) High CVE-2024-28199

Packages

EcosystemPackageAffectedFixed in
RubyGems phlex >= 1.9.0, < 1.9.1 1.9.1
RubyGems phlex >= 1.8.0, < 1.8.2 1.8.2
RubyGems phlex >= 1.7.0, < 1.7.1 1.7.1
RubyGems phlex >= 1.6.0, < 1.6.2 1.6.2
RubyGems phlex >= 1.5.0, < 1.5.2 1.5.2
RubyGems phlex >= 1.4.0, < 1.4.1 1.4.1
RubyGems phlex >= 1.3.0, < 1.3.3 1.3.3
RubyGems phlex >= 1.2.0, < 1.2.2 1.2.2
RubyGems phlex >= 1.1.0, < 1.1.1 1.1.1
RubyGems phlex < 1.0.1 1.0.1

Details

As written in the advisory (Markdown source, shown as plain text).

There is a potential cross-site scripting (XSS) vulnerability that can be exploited via maliciously crafted user data. This was due to improper case-sensitivity in the code that was meant to prevent these attacks. ### Impact If you render an `<a>` tag with an `href` attribute set to a user-provided link, that link could potentially execute JavaScript when clicked by another user. ```ruby a(href: user_profile) { "Profile" } ``` If you splat user-provided attributes when rendering any HTML or SVG tag, malicious event attributes could be included in the output, executing JavaScript when the events are triggered by another user. ```ruby h1(**JSON.parse(user_attributes)) ``` ### Patches Patches are [available on RubyGems](https://rubygems.org/gems/phlex) for all `1.x` minor versions. The patched versions are: - [1.9.1](https://rubygems.org/gems/phlex/versions/1.9.1) - [1.8.2](https://rubygems.org/gems/phlex/versions/1.8.2) - [1.7.1](https://rubygems.org/gems/phlex/versions/1.7.1) - [1.6.2](https://rubygems.org/gems/phlex/versions/1.6.2) - [1.5.2](https://rubygems.org/gems/phlex/versions/1.5.2) - [1.4.1](https://rubygems.org/gems/phlex/versions/1.4.1) - [1.3.3](https://rubygems.org/gems/phlex/versions/1.3.3) - [1.2.2](https://rubygems.org/gems/phlex/versions/1.2.2) - [1.1.1](https://rubygems.org/gems/phlex/versions/1.1.1) - [1.0.1](https://rubygems.org/gems/phlex/versions/1.0.1) If you are on `main`, it has been patched since [`aa50c60`](https://github.com/phlex-ruby/phlex/commit/aa50c604cdee1d0ce7ef068a4c66cbd5d43f96a1) ### Workarounds Configuring a [Content Security Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy) that does not allow [`unsafe-inline`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy#unsafe-inline) would effectively prevent this vulnerability from being exploited. ### References In addition to upgrading to a patched version of Phlex, we strongly recommend configuring a Content Security Policy header that does not allow `unsafe-inline`. Here’s how you can configure a Content Security Policy header in Rails. https://guides.rubyonrails.org/security.html#content-security-policy-header

References

External links from the advisory. They lead to third-party sites.