CVE-2021-43812: @auth0/nextjs auth0 Open Redirect Vulnerability

MODERATE
Advisory Identifier: GHSA-2mqv-4j3r-vjvp
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CVSS 6.4
CWE-601
Published
Advisory Summary

CVE-2021-43812 is a MODERATE (CVSS 6.4) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting @auth0/nextjs auth0 libraries in the npm ecosystem. The issue involves open redirect in @auth0/nextjs-auth0. Remediation is available by upgrading affected packages to version 1.6.2.

CVE-2021-43812 at a Glance

CVE Identifier CVE-2021-43812
GHSA Identifier GHSA-2mqv-4j3r-vjvp
Severity MODERATE
CVSS v3.1 Base Score 6.4
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product @auth0/nextjs auth0
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.4

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

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

How to Fix CVE-2021-43812

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: 1.6.2 
npm install @auth0/nextjs-auth0@1.6.2
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-2021-43812, 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 1.6.2), 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. 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 `<=1.6.1` do not filter out certain `returnTo` parameter values from the login url, which expose the application to an open redirect vulnerability. ### Am I affected? You are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `<=1.6.1`. ### How to fix that? Upgrade to version `>=1.6.2` ### Will this update impact my users? The fix provided in the patch will not affect your users.

CVE-2021-43812 Affected @auth0/nextjs auth0 Versions

1 component(s)
Fixed Versions:
1.6.2
Product / Package Ecosystem Affected Versions Fixed Version
@auth0/nextjs-auth0
npm/@auth0/nextjs-auth0
npm
< 1.6.2
1.6.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvp
NVD — CVE-2021-43812 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43812
Security Fix Commit FIX COMMIT
https://github.com/auth0/nextjs-auth0/commit/0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6
@auth0/nextjs auth0 Source Repository REPOSITORY
https://github.com/auth0/nextjs-auth0

Frequently Asked Questions

What is CVE-2021-43812?
CVE-2021-43812 is a security vulnerability in @auth0/nextjs auth0 involving Open redirect in @auth0/nextjs-auth0 under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which @auth0/nextjs auth0 versions are affected?
Affected versions include releases prior to 1.6.2 across affected packages: @auth0/nextjs-auth0.
What version fixes CVE-2021-43812?
Upgrading to 1.6.2 (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 1.6.2. Upgrade your dependency to 1.6.2 or later.
What is the CVSS score of CVE-2021-43812?
CVE-2021-43812 has a CVSS v3.1 base score of 6.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-43812?
CVE-2021-43812 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check npm dependencies for CVE-2021-43812?
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-2mqv-4j3r-vjvp",
  "modified" : "2021-12-16T18:42:05Z",
  "published" : "2021-12-16T18:52:21Z",
  "aliases" : [ "CVE-2021-43812" ],
  "summary" : "Open redirect in @auth0/nextjs-auth0",
  "details" : "### Overview\n\nVersions `<=1.6.1` do not filter out certain `returnTo` parameter values from the login url, which expose the application to an open redirect vulnerability.\n\n### Am I affected?\nYou are affected by this vulnerability if you are using `@auth0/nextjs-auth0` version `<=1.6.1`.\n\n### How to fix that?\nUpgrade to version `>=1.6.2`\n\n### Will this update impact my users?\nThe fix provided in the patch will not affect your users.\n\n",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@auth0/nextjs-auth0"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.6.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/nextjs-auth0/security/advisories/GHSA-2mqv-4j3r-vjvp"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-43812"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/nextjs-auth0/commit/0bbd9f8a0c93af51f607f28633b5fb18c5e48ad6"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/auth0/nextjs-auth0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-12-16T18:42:05Z",
    "nvd_published_at" : "2021-12-16T19:15:00Z"
  }
}