Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS0yNDJwLTR2MzktMnY4Z84AA56s

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:

• 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

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

Permalink: https://github.com/advisories/GHSA-242p-4v39-2v8g
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0yNDJwLTR2MzktMnY4Z84AA56s
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 10 months ago
Updated: 10 months ago

CVSS Score: 7.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N

EPSS Percentage: 0.00045
EPSS Percentile: 0.17541

Identifiers: GHSA-242p-4v39-2v8g, CVE-2024-28199
References:

• https://github.com/phlex-ruby/phlex/security/advisories/GHSA-242p-4v39-2v8g
• https://nvd.nist.gov/vuln/detail/CVE-2024-28199
• 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/rubysec/ruby-advisory-db/blob/master/gems/phlex/CVE-2024-28199.yml
• https://github.com/advisories/GHSA-242p-4v39-2v8g

Repository: https://github.com/phlex-ruby/phlex
Blast Radius: 8.7

Affected Packages