CVE-2020-8176: @shopify/koa shopify auth Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-jqh7-w5pr-cr56
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-8176 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting @shopify/koa shopify auth libraries in the npm ecosystem. The issue involves cross-site scripting in @shopify/koa-shopify-auth. Remediation is available by upgrading affected packages to version 3.1.63.

CVE-2020-8176 at a Glance

CVE Identifier CVE-2020-8176
GHSA Identifier GHSA-jqh7-w5pr-cr56
Severity MODERATE
CVSS v3.1 Base Score 6.1
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product @shopify/koa shopify auth
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.1

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:R/S:C/C:L/I:L/A:N).

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

How to Fix CVE-2020-8176

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

@shopify/koa-shopify-auth fixed: 3.1.63 
npm install @shopify/koa-shopify-auth@3.1.63
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 @shopify/koa-shopify-auth

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-8176, inspect your project dependencies using npm:

npm ls @shopify/koa-shopify-auth

Analyze the terminal output to locate any version of @shopify/koa shopify auth in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.63), your application is affected.

Note: The npm ls @shopify/koa-shopify-auth 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-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In @shopify/koa shopify auth, 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

A cross-site scripting vulnerability exists in koa-shopify-auth v3.1.61-v3.1.62 that allows an attacker to inject JS payloads into the `shop` parameter on the `/shopify/auth/enable_cookies` endpoint.

CVE-2020-8176 Affected @shopify/koa shopify auth Versions

1 component(s)
Fixed Versions:
3.1.63
Product / Package Ecosystem Affected Versions Fixed Version
@shopify/koa-shopify-auth
npm/@shopify/koa-shopify-auth
npm
≥ 3.1.61
< 3.1.63
3.1.63

References

NVD — CVE-2020-8176 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8176
@shopify/koa shopify auth Source Repository REPOSITORY
https://github.com/Shopify/quilt/pull/1455
hackerone.com/reports/881409 WEB
https://hackerone.com/reports/881409

Frequently Asked Questions

What is CVE-2020-8176?
CVE-2020-8176 is a security vulnerability in @shopify/koa shopify auth involving Cross-site scripting in @shopify/koa-shopify-auth under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which @shopify/koa shopify auth versions are affected?
Affected versions include releases prior to 3.1.63 across affected packages: @shopify/koa-shopify-auth.
What version fixes CVE-2020-8176?
Upgrading to 3.1.63 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @shopify/koa-shopify-auth affected?
Yes, @shopify/koa-shopify-auth is affected in releases prior to 3.1.63. Upgrade your dependency to 3.1.63 or later.
What is the CVSS score of CVE-2020-8176?
CVE-2020-8176 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2020-8176?
CVE-2020-8176 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).
How can I check npm dependencies for CVE-2020-8176?
Run the dependency tree command: 'npm ls @shopify/koa-shopify-auth'. 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-jqh7-w5pr-cr56",
  "modified" : "2022-09-09T20:01:21Z",
  "published" : "2021-05-17T21:01:22Z",
  "aliases" : [ "CVE-2020-8176" ],
  "summary" : "Cross-site scripting in @shopify/koa-shopify-auth",
  "details" : "A cross-site scripting vulnerability exists in koa-shopify-auth v3.1.61-v3.1.62 that allows an attacker to inject JS payloads into the `shop` parameter on the `/shopify/auth/enable_cookies` endpoint.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@shopify/koa-shopify-auth"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.1.61"
      }, {
        "fixed" : "3.1.63"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.1.62"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8176"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Shopify/quilt/pull/1455"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/881409"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-11T18:29:58Z",
    "nvd_published_at" : "2020-07-02T19:15:00Z"
  }
}