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GHSA-242p-4v39-2v8g: Cross-site Scripting (XSS) possible with maliciously formed HTML attribute names and values in Phlex

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.

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.

h1(**JSON.parse(user_attributes))

Patches

Patches are available on RubyGems for all 1.x minor versions. The patched versions are:

If you are on main, it has been patched since aa50c60

Workarounds

Configuring a Content Security Policy that does not allow 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

ghsa
#xss#vulnerability#web#js#git#java#ruby

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  1. GitHub Advisory Database
  2. GitHub Reviewed
  3. CVE-2024-28199

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

High severity GitHub Reviewed Published Mar 11, 2024 in phlex-ruby/phlex • Updated Mar 12, 2024

Package

Affected versions

= 1.9.0

>= 1.8.0, < 1.8.2

= 1.7.0

>= 1.6.0, < 1.6.2

>= 1.5.0, < 1.5.2

= 1.4.0

>= 1.3.0, < 1.3.3

>= 1.2.0, < 1.2.2

= 1.1.0

< 1.0.1

Patched versions

1.9.1

1.8.2

1.7.1

1.6.2

1.5.2

1.4.1

1.3.3

1.2.2

1.1.1

1.0.1

Description

Published to the GitHub Advisory Database

Mar 12, 2024

Last updated

Mar 12, 2024

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