ADVISORIES
GEM
SEVERITY
CVSS v3.x: 7.1 (High)
PATCHED VERSIONS
- ~> 1.0.1
- ~> 1.1.1
- ~> 1.2.2
- ~> 1.3.3
- ~> 1.4.1
- ~> 1.5.2
- ~> 1.6.2
- ~> 1.7.1
- ~> 1.8.2
- >= 1.9.1
DESCRIPTION
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
RELATED
- https://nvd.nist.gov/vuln/detail/CVE-2024-28199
- https://github.com/phlex-ruby/phlex/security/advisories/GHSA-242p-4v39-2v8g
- https://github.com/phlex-ruby/phlex/commit/aa50c604cdee1d0ce7ef068a4c66cbd5d43f96a1
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy#unsafe-inline
- https://github.com/advisories/GHSA-242p-4v39-2v8g