CVE-2020-15119: Auth0 lock Cross-Site Scripting Vulnerability

LOW
Advisory Identifier: GHSA-6gg3-pmm7-97xc
Share
CVSS 6.4
CWE-79
Published
Advisory Summary

CVE-2020-15119 is a LOW (CVSS 6.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Auth0 lock libraries in the npm ecosystem. The issue involves dom-based xss in auth0-lock. Remediation is available by upgrading affected packages to version 11.26.3.

CVE-2020-15119 at a Glance

CVE Identifier CVE-2020-15119
GHSA Identifier GHSA-6gg3-pmm7-97xc
Severity LOW
CVSS v3.1 Base Score 6.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Auth0 lock
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:H/PR:L/UI:R/S:U/C:H/I:H/A:N).

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

How to Fix CVE-2020-15119

To remediate this vulnerability, upgrade all affected Auth0 lock 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-lock fixed: 11.26.3 
npm install auth0-lock@11.26.3
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-lock

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-15119, inspect your project dependencies using npm:

npm ls auth0-lock

Analyze the terminal output to locate any version of Auth0 lock in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 11.26.3), your application is affected.

Note: The npm ls auth0-lock 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 lock, 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 `11.25.1` are using `dangerouslySetInnerHTML` to display an informational message when used with a Passwordless or Enterprise connection. - For Passwordless connection, the value of the input (email or phone number) is displayed back to the user while waiting for verification code input. - For Enterprise connection, the value of the input (IdP Domain) from the Enterprise connection setup screen (Auth0 Dashboard) is displayed back to the user when the `lock` widget opens. When Passwordless or Enterprise connection is used, the application and its users might be exposed to cross-site scripting (XSS) attacks. ### Am I affected? You are affected by this vulnerability if all of the following conditions apply: - You are using auth0-lock - You are using Passwordless or Enterprise connection mode ### How to fix that? Upgrade to version `11.26.3` ### Will this update impact my users? The fix provided in patch will not affect your users. ### Credit https://github.com/mvisat

CVE-2020-15119 Affected Auth0 lock Versions

1 component(s)
Fixed Versions:
11.26.3
Product / Package Ecosystem Affected Versions Fixed Version
auth0-lock
npm/auth0-lock
npm
< 11.26.3
11.26.3

References

GitHub Advisory / Wiki ADVISORY
https://github.com/auth0/lock/security/advisories/GHSA-6gg3-pmm7-97xc
NVD — CVE-2020-15119 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15119
Security Fix Commit FIX COMMIT
https://github.com/auth0/lock/commit/3711fb5b42afd40073a61a58759251f51e768b1b

Frequently Asked Questions

What is CVE-2020-15119?
CVE-2020-15119 is a security vulnerability in Auth0 lock involving DOM-based XSS in auth0-lock under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Auth0 lock versions are affected?
Affected versions include releases prior to 11.26.3 across affected packages: auth0-lock.
What version fixes CVE-2020-15119?
Upgrading to 11.26.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is auth0-lock affected?
Yes, auth0-lock is affected in releases prior to 11.26.3. Upgrade your dependency to 11.26.3 or later.
What is the CVSS score of CVE-2020-15119?
CVE-2020-15119 has a CVSS v3.1 base score of 6.4 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N.
What CWE is associated with CVE-2020-15119?
CVE-2020-15119 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-2020-15119?
Run the dependency tree command: 'npm ls auth0-lock'. 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-6gg3-pmm7-97xc",
  "modified" : "2021-01-07T23:40:43Z",
  "published" : "2020-08-19T21:05:03Z",
  "aliases" : [ "CVE-2020-15119" ],
  "summary" : "DOM-based XSS in auth0-lock",
  "details" : "### Overview\nVersions before and including `11.25.1` are using `dangerouslySetInnerHTML` to display an informational message when used with a Passwordless or Enterprise connection.\n\n- For Passwordless connection, the value of the input (email or phone number) is displayed back to the user while waiting for verification code input.  \n- For Enterprise connection, the value of the input (IdP Domain) from the Enterprise connection setup screen (Auth0 Dashboard) is displayed back to the user when the `lock` widget opens.\n\nWhen Passwordless or Enterprise connection is used, the application and its users might be exposed to cross-site scripting (XSS) attacks.\n\n### Am I affected?\nYou are affected by this vulnerability if all of the following conditions apply:\n\n- You are using auth0-lock\n- You are using Passwordless or Enterprise connection mode\n\n### How to fix that?\nUpgrade to version `11.26.3`\n\n### Will this update impact my users?\nThe fix provided in patch will not affect your users.\n\n### Credit\nhttps://github.com/mvisat",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "auth0-lock"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "11.26.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 11.25.1"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/auth0/lock/security/advisories/GHSA-6gg3-pmm7-97xc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-15119"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/auth0/lock/commit/3711fb5b42afd40073a61a58759251f51e768b1b"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-19T21:02:01Z",
    "nvd_published_at" : null
  }
}