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Trix Editor Arbitrary Code Execution Vulnerability

Moderate severity GitHub Reviewed Published May 7, 2024 in basecamp/trix • Updated Jun 3, 2024

Package

bundler actiontext (RubyGems)

Affected versions

>= 7.0.0.alpha1, < 7.0.8.3
>= 7.1.0.beta1, < 7.1.3.3

Patched versions

7.0.8.3
7.1.3.3
npm trix (npm)
>= 2.0.0, < 2.1.1
>= 0.9.0, < 1.3.2
2.1.1
1.3.2

Description

The Trix editor, versions prior to 2.1.1, is vulnerable to arbitrary code execution when copying and pasting content from the web or other documents with markup into the editor. The vulnerability stems from improper sanitization of pasted content, allowing an attacker to embed malicious scripts which are executed within the context of the application.

Vulnerable Versions:

  • 1.x series up to and including 1.3.1
  • 2.x series up to and including 2.1.0

Fixed Versions:

  • v1.3.2
  • v2.1.1

Vector:

  • Bug 1: When copying content manipulated by a script, such as:
document.addEventListener('copy', function(e){
  e.clipboardData.setData('text/html', '<div><noscript><div class="123</noscript>456<img src=1 onerror=alert(1)//"></div></noscript></div>');
  e.preventDefault();
});

and pasting into the Trix editor, the script within the content is executed.

  • Bug 2: Similar execution occurs with content structured as:
document.write(`copy<div data-trix-attachment="{&quot;contentType&quot;:&quot;text/html&quot;,&quot;content&quot;:&quot;&lt;img src=1 onerror=alert(101)&gt;HELLO123&quot;}"></div>me`);

Impact:

An attacker could exploit these vulnerabilities to execute arbitrary JavaScript code within the context of the user's session, potentially leading to unauthorized actions being performed or sensitive information being disclosed.

Remediation:

Update Recommendation: Users should upgrade to Trix editor version 2.1.1 or later, which incorporates proper sanitization of input from copied content.

CSP Enhancement: Additionally, enhancing the Content Security Policy (CSP) to disallow inline scripts can significantly mitigate the risk of such vulnerabilities. Set CSP policies such as script-src 'self' to ensure that only scripts hosted on the same origin are executed, and explicitly prohibit inline scripts using script-src-elem.

References:

Credit: These issues were reported by security researchers loknop and pinpie.

References

@afcapel afcapel published to basecamp/trix May 7, 2024
Published by the National Vulnerability Database May 7, 2024
Published to the GitHub Advisory Database May 7, 2024
Reviewed May 7, 2024
Last updated Jun 3, 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
Unchanged
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:U/C:L/I:L/A:N

EPSS score

0.044%
(11th percentile)

Weaknesses

CVE ID

CVE-2024-34341

GHSA ID

GHSA-qjqp-xr96-cj99

Source code

Credits

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