CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
10.3%
There is a potential cross-site scripting (XSS) vulnerability that can be exploited via maliciously crafted user data.
The reason these issues were not detected before is the escapes were working as designed. However, their design didnβt take into account just how recklessly permissive browser are when it comes to executing unsafe JavaScript via HTML attributes.
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 are available on RubyGems for all minor versions released in the last year.
If you are on main
, it has been patched since da8f943
Configuring a Content Security Policy that does not allow unsafe-inline
would effectively prevent this vulnerability from being exploited.
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
. Hereβs how you can configure a Content Security Policy header in Rails. https://guides.rubyonrails.org/security.html#content-security-policy-header
developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy
developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy#unsafe-inline
github.com/payloadbox/xss-payload-list
github.com/phlex-ruby/phlex
github.com/phlex-ruby/phlex/commit/da8f94342a84cff9d78c98bcc3b3604ee2e577d2
github.com/phlex-ruby/phlex/security/advisories/GHSA-9p57-h987-4vgx
github.com/rubysec/ruby-advisory-db/blob/master/gems/phlex/CVE-2024-32970.yml
nvd.nist.gov/vuln/detail/CVE-2024-32970
rubygems.org/gems/phlex
rubygems.org/gems/phlex/versions/1.10.2
rubygems.org/gems/phlex/versions/1.9.3
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
10.3%