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Prototype pollution vulnerability found in Mermaid's bundled version of DOMPurify

High severity GitHub Reviewed Published Oct 22, 2024 in mermaid-js/mermaid • Updated Oct 23, 2024

Package

npm mermaid (npm)

Affected versions

<= 10.9.2

Patched versions

10.9.3

Description

The following bundled files within the Mermaid NPM package contain a bundled version of DOMPurify that is vulnerable to GHSA-mmhx-hmjr-r674, potentially resulting in an XSS attack.

This affects the built:

  • dist/mermaid.min.js
  • dist/mermaid.js
  • dist/mermaid.esm.mjs
  • dist/mermaid.esm.min.mjs

This will also affect users that use the above files via a CDN link, e.g. https://cdn.jsdelivr.net/npm/[email protected]/dist/mermaid.min.js

Users that use the default NPM export of mermaid, e.g. import mermaid from 'mermaid', or the dist/mermaid.core.mjs file, do not use this bundled version of DOMPurify, and can easily update using their package manager with something like npm audit fix.

Patches

  • develop branch: 6c785c93166c151d27d328ddf68a13d9d65adc00
  • backport to v10: 92a07ffe40aab2769dd1c3431b4eb5beac282b34

References

@aloisklink aloisklink published to mermaid-js/mermaid Oct 22, 2024
Published to the GitHub Advisory Database Oct 22, 2024
Reviewed Oct 22, 2024
Last updated Oct 23, 2024

Severity

High

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
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low

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:H/PR:N/UI:N/S:U/C:L/I:H/A:L

EPSS score

Weaknesses

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Learn more on MITRE.

Dependency on Vulnerable Third-Party Component

The product has a dependency on a third-party component that contains one or more known vulnerabilities. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-m4gq-x24j-jpmf

Source code

Credits

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