CVE-2020-7765: @firebase/util Remote Code Execution Vulnerability

MODERATE
Advisory Identifier: GHSA-fpm5-vv97-jfwg
Share
CVSS 5.3
CWE-400
Published
Advisory Summary

CVE-2020-7765 is a MODERATE (CVSS 5.3) remote code execution vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting @firebase/util libraries in the npm ecosystem. The issue involves uncontrolled resource consumption in firebase. Remediation is available by upgrading affected packages to version 0.3.4.

CVE-2020-7765 at a Glance

CVE Identifier CVE-2020-7765
GHSA Identifier GHSA-fpm5-vv97-jfwg
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product @firebase/util
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2020-7765

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

@firebase/util fixed: 0.3.4 
npm install @firebase/util@0.3.4
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 @firebase/util

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7765, inspect your project dependencies using npm:

npm ls @firebase/util

Analyze the terminal output to locate any version of @firebase/util in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.4), your application is affected.

Note: The npm ls @firebase/util 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In @firebase/util, 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

This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.

CVE-2020-7765 Affected @firebase/util Versions

1 component(s)
Fixed Versions:
0.3.4
Product / Package Ecosystem Affected Versions Fixed Version
@firebase/util
npm/@firebase/util
npm
< 0.3.4
0.3.4

References

NVD — CVE-2020-7765 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7765
@firebase/util Source Repository REPOSITORY
https://github.com/firebase/firebase-js-sdk/pull/4001
Security Fix Commit FIX COMMIT
https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada
snyk.io/vuln/snyk-js-fireba... WEB
https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324

Frequently Asked Questions

What is CVE-2020-7765?
CVE-2020-7765 is a security vulnerability in @firebase/util involving Uncontrolled Resource Consumption in firebase under CWE-400: Uncontrolled Resource Consumption.
Which @firebase/util versions are affected?
Affected versions include releases prior to 0.3.4 across affected packages: @firebase/util.
What version fixes CVE-2020-7765?
Upgrading to 0.3.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @firebase/util affected?
Yes, @firebase/util is affected in releases prior to 0.3.4. Upgrade your dependency to 0.3.4 or later.
What is the CVSS score of CVE-2020-7765?
CVE-2020-7765 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2020-7765?
CVE-2020-7765 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2020-7765?
Run the dependency tree command: 'npm ls @firebase/util'. 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-fpm5-vv97-jfwg",
  "modified" : "2021-04-15T21:39:07Z",
  "published" : "2021-05-18T01:57:24Z",
  "aliases" : [ "CVE-2020-7765" ],
  "summary" : "Uncontrolled Resource Consumption in firebase",
  "details" : "This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@firebase/util"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7765"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/firebase/firebase-js-sdk/pull/4001"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-15T21:39:07Z",
    "nvd_published_at" : "2020-11-16T12:15:00Z"
  }
}