CVE-2021-32702: @auth0/nextjs auth0 Cross-Site Scripting Vulnerability

HIGH
Advisory Identifier: GHSA-954c-jjx6-cxv7
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CVSS 8.0
CWE-79
Published
Advisory Summary

CVE-2021-32702 is a HIGH (CVSS 8.0) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting @auth0/nextjs auth0 libraries in the npm ecosystem. The issue involves reflected xss from the callback handler's error query parameter. Remediation is available by upgrading affected packages to version 1.4.2.

CVE-2021-32702 at a Glance

CVE Identifier CVE-2021-32702
GHSA Identifier GHSA-954c-jjx6-cxv7
Severity HIGH
CVSS v3.1 Base Score 8.0
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product @auth0/nextjs auth0
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 8.0

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

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

How to Fix CVE-2021-32702

To remediate this vulnerability, upgrade all affected @auth0/nextjs auth0 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

@auth0/nextjs-auth0 fixed: 1.4.2 
npm install @auth0/nextjs-auth0@1.4.2
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 @auth0/nextjs-auth0

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-32702, inspect your project dependencies using npm:

npm ls @auth0/nextjs-auth0

Analyze the terminal output to locate any version of @auth0/nextjs auth0 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.2), your application is affected.

Note: The npm ls @auth0/nextjs-auth0 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 @auth0/nextjs auth0, 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

### Overview Versions before and including `1.4.1` are vulnerable to reflected XSS. An attacker can execute arbitrary code by providing an XSS payload in the `error` query parameter which is then processed by the callback handler as an error message. ### Am I affected? You are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `1.4.1` or lower **unless** you are using custom error handling that does not return the error message in an HTML response. ### How to fix that? Upgrade to version `1.4.2`. ### Will this update impact my users? The fix adds basic HTML escaping to the error message and it should not impact your users. ### Credit https://github.com/inian https://github.com/git-ishanpatel

CVE-2021-32702 Affected @auth0/nextjs auth0 Versions

1 component(s)
Fixed Versions:
1.4.2
Product / Package Ecosystem Affected Versions Fixed Version
@auth0/nextjs-auth0
npm/@auth0/nextjs-auth0
npm
< 1.4.2
1.4.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-954c-jjx6-cxv7
NVD — CVE-2021-32702 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32702
Security Fix Commit FIX COMMIT
https://github.com/auth0/nextjs-auth0/commit/6996e2528ceed98627caa28abafbc09e90163ccf
www.npmjs.com/package/@auth0/next... WEB
https://www.npmjs.com/package/@auth0/nextjs-auth0

Frequently Asked Questions

What is CVE-2021-32702?
CVE-2021-32702 is a security vulnerability in @auth0/nextjs auth0 involving Reflected XSS from the callback handler's error query parameter under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which @auth0/nextjs auth0 versions are affected?
Affected versions include releases prior to 1.4.2 across affected packages: @auth0/nextjs-auth0.
What version fixes CVE-2021-32702?
Upgrading to 1.4.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is @auth0/nextjs-auth0 affected?
Yes, @auth0/nextjs-auth0 is affected in releases prior to 1.4.2. Upgrade your dependency to 1.4.2 or later.
What is the CVSS score of CVE-2021-32702?
CVE-2021-32702 has a CVSS v3.1 base score of 8.0 (HIGH) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.
What CWE is associated with CVE-2021-32702?
CVE-2021-32702 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-2021-32702?
Run the dependency tree command: 'npm ls @auth0/nextjs-auth0'. 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-954c-jjx6-cxv7",
  "modified" : "2021-06-28T19:06:42Z",
  "published" : "2021-06-28T16:46:41Z",
  "aliases" : [ "CVE-2021-32702" ],
  "summary" : "Reflected XSS from the callback handler's error query parameter",
  "details" : "### Overview\n\nVersions before and including `1.4.1` are vulnerable to reflected XSS.  An attacker can execute arbitrary code by providing an XSS payload in the `error` query parameter which is then processed by the callback handler as an error message.\n\n### Am I affected?\nYou are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `1.4.1` or lower **unless** you are using custom error handling that does not return the error message in an HTML response.\n\n### How to fix that?\nUpgrade to version `1.4.2`.\n\n### Will this update impact my users?\nThe fix adds basic HTML escaping to the error message and it should not impact your users.\n\n### Credit\n\nhttps://github.com/inian\nhttps://github.com/git-ishanpatel",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@auth0/nextjs-auth0"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-954c-jjx6-cxv7"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-32702"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/nextjs-auth0/commit/6996e2528ceed98627caa28abafbc09e90163ccf"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/@auth0/nextjs-auth0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-06-25T15:38:26Z",
    "nvd_published_at" : "2021-06-25T17:15:00Z"
  }
}