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view_component Cross-site Scripting vulnerability

Moderate severity GitHub Reviewed Published Jan 4, 2024 in ViewComponent/view_component • Updated Jan 9, 2024

Package

bundler view_component (RubyGems)

Affected versions

>= 3.0.0, < 3.9.0
< 2.83.0

Patched versions

3.9.0
2.83.0

Description

Impact

What kind of vulnerability is it? Who is impacted?

This is an XSS vulnerability that has the potential to impact anyone rendering a component directly from a controller with the view_component gem. Note that only components that define a #call method (i.e. instead of using a sidecar template) are affected. The return value of the #call method is not sanitized and can include user-defined content.

In addition, the return value of the #output_postamble method is not sanitized, which can also lead to XSS issues.

Patches

Has the problem been patched? What versions should users upgrade to?

Versions 3.9.0 has been released and fully mitigates both the #call and the #output_postamble vulnerabilities.

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

Sanitize the return value of #call, eg:

class MyComponent < ApplicationComponent
  def call
    html_escape("<div>#{user_input}</div>")
  end
end

References

Are there any links users can visit to find out more?

ViewComponent/view_component#1950

For more information

If you have any questions or comments about this advisory:

Open an issue in the github/view_component project.

References

@camertron camertron published to ViewComponent/view_component Jan 4, 2024
Published by the National Vulnerability Database Jan 4, 2024
Published to the GitHub Advisory Database Jan 4, 2024
Reviewed Jan 4, 2024
Last updated Jan 9, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.052%
(21st percentile)

Weaknesses

CVE ID

CVE-2024-21636

GHSA ID

GHSA-wf2x-8w6j-qw37

Credits

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