GHSA-3f95-w5h5-fq86: Mergify Prototype Pollution Vulnerability

MODERATE
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CWE-1321
Published
Advisory Summary

GHSA-3f95-w5h5-fq86 is a MODERATE prototype pollution vulnerability (CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')) affecting Mergify libraries in the npm ecosystem. The issue involves prototype pollution in mergify. Remediation is available in the latest vendor maintenance releases.

GHSA-3f95-w5h5-fq86 at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-3f95-w5h5-fq86
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Affected Product Mergify
Package Ecosystem npm
Published Date
Last Updated

How to Fix GHSA-3f95-w5h5-fq86

To remediate this vulnerability, upgrade all affected Mergify dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

mergify fixed: Latest secure release 
npm install mergify@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls mergify

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-3f95-w5h5-fq86, inspect your project dependencies using npm:

npm ls mergify

Analyze the terminal output to locate any version of Mergify in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls mergify command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), where 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. In Mergify, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

All versions of `mergify` are vulnerable to Prototype Pollution. The `mergify()` function allows attackers to modify the prototype of Object causing the addition or modification of an existing property that will exist on all objects. ## Recommendation No fix is currently available. Consider using an alternative module as the package is deprecated.

GHSA-3f95-w5h5-fq86 Affected Mergify Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
mergify
npm/mergify
npm

References

hackerone.com/reports/439098 WEB
https://hackerone.com/reports/439098
www.npmjs.com/advisories/995 WEB
https://www.npmjs.com/advisories/995

Frequently Asked Questions

What is GHSA-3f95-w5h5-fq86?
GHSA-3f95-w5h5-fq86 is a security vulnerability in Mergify involving Prototype Pollution in mergify under CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution').
Which Mergify versions are affected?
Affected versions include releases prior to current release patches across affected packages: mergify.
What version fixes GHSA-3f95-w5h5-fq86?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is mergify affected?
Yes, mergify is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What CWE is associated with GHSA-3f95-w5h5-fq86?
GHSA-3f95-w5h5-fq86 is classified under CWE-1321: 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.).
How can I check npm dependencies for GHSA-3f95-w5h5-fq86?
Run the dependency tree command: 'npm ls mergify'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3f95-w5h5-fq86",
  "modified" : "2020-08-31T18:43:27Z",
  "published" : "2020-09-11T21:22:24Z",
  "aliases" : [ ],
  "summary" : "Prototype Pollution in mergify",
  "details" : "All versions of `mergify` are vulnerable to Prototype Pollution. The `mergify()` function allows attackers to modify the prototype of Object causing the addition or modification of an existing property that will exist on all objects.\n\n\n\n\n## Recommendation\n\nNo fix is currently available. Consider using an alternative module as the package is deprecated.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "mergify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/439098"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/advisories/995"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1321" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-31T18:43:27Z",
    "nvd_published_at" : null
  }
}