CVE-2019-16929: Auth0.AuthenticationApi Improper Authentication Vulnerability

HIGH
Advisory Identifier: GHSA-c9cg-q8r2-xvjq
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CVSS 7.5
CWE-287
Published
Advisory Summary

CVE-2019-16929 is a HIGH (CVSS 7.5) improper authentication vulnerability (CWE-287: Improper Authentication) affecting Auth0.AuthenticationApi libraries in the NuGet ecosystem. The issue involves improper authentication in auth0.authenticationapi. Remediation is available by upgrading affected packages to version 6.5.4.

CVE-2019-16929 at a Glance

CVE Identifier CVE-2019-16929
GHSA Identifier GHSA-c9cg-q8r2-xvjq
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-287: Improper Authentication
Affected Product Auth0.AuthenticationApi
Package Ecosystem NuGet
Published Date
Last Updated

Security Impact

CVSS: 7.5

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:H/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 High (I:H)
Availability None (A:N)

How to Fix CVE-2019-16929

To remediate this vulnerability, upgrade all affected Auth0.AuthenticationApi 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.AuthenticationApi fixed: 6.5.4 
Upgrade Auth0.AuthenticationApi to 6.5.4
Verify Direct and Transitive Dependencies

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

inspect dependencies for Auth0.AuthenticationApi

How to Check if You Are Affected

To determine whether your application is affected by CVE-2019-16929, inspect your project dependencies for Auth0.AuthenticationApi:

inspect dependencies for Auth0.AuthenticationApi

Analyze the terminal output to locate any version of Auth0.AuthenticationApi in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.5.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Auth0.AuthenticationApi, 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

Auth0 auth0.net before 6.5.4 has Incorrect Access Control because IdentityTokenValidator can be accidentally used to validate untrusted ID tokens.

CVE-2019-16929 Affected Auth0.AuthenticationApi Versions

1 component(s)
Fixed Versions:
6.5.4
Product / Package Ecosystem Affected Versions Fixed Version
Auth0.AuthenticationApi
nuget/Auth0.AuthenticationApi
NuGet
≥ 5.8.0
< 6.5.4
6.5.4

References

NVD — CVE-2019-16929 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-16929
Auth0.AuthenticationApi Security Information SECURITY
https://auth0.com/docs/security/bulletins/cve-2019-16929

Frequently Asked Questions

What is CVE-2019-16929?
CVE-2019-16929 is a security vulnerability in Auth0.AuthenticationApi involving Improper Authentication in Auth0.AuthenticationApi under CWE-287: Improper Authentication.
Which Auth0.AuthenticationApi versions are affected?
Affected versions include releases prior to 6.5.4 across affected packages: Auth0.AuthenticationApi.
What version fixes CVE-2019-16929?
Upgrading to 6.5.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is Auth0.AuthenticationApi affected?
Yes, Auth0.AuthenticationApi is affected in releases prior to 6.5.4. Upgrade your dependency to 6.5.4 or later.
What is the CVSS score of CVE-2019-16929?
CVE-2019-16929 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
What CWE is associated with CVE-2019-16929?
CVE-2019-16929 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check NuGet dependencies for CVE-2019-16929?
Run the dependency tree command: 'inspect dependencies for Auth0.AuthenticationApi'. 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-c9cg-q8r2-xvjq",
  "modified" : "2021-08-18T22:01:20Z",
  "published" : "2019-10-24T20:56:12Z",
  "aliases" : [ "CVE-2019-16929" ],
  "summary" : "Improper Authentication in Auth0.AuthenticationApi",
  "details" : "Auth0 auth0.net before 6.5.4 has Incorrect Access Control because IdentityTokenValidator can be accidentally used to validate untrusted ID tokens.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "NuGet",
      "name" : "Auth0.AuthenticationApi"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.8.0"
      }, {
        "fixed" : "6.5.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-16929"
  }, {
    "type" : "WEB",
    "url" : "https://auth0.com/docs/security/bulletins/cve-2019-16929"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2019-10-24T20:55:50Z",
    "nvd_published_at" : "2019-10-08T13:15:00Z"
  }
}