CVE-2020-15500: Tileserver gl Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-3fr8-mwpp-8h9p
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CVSS 6.1
CWE-79
Published
Advisory Summary

CVE-2020-15500 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Tileserver gl libraries in the npm ecosystem. The issue involves cross-site scripting in tileserver gl. Remediation is available by upgrading affected packages to version 3.1.0.

CVE-2020-15500 at a Glance

CVE Identifier CVE-2020-15500
GHSA Identifier GHSA-3fr8-mwpp-8h9p
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 Tileserver gl
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-2020-15500

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

tileserver-gl fixed: 3.1.0 
npm install tileserver-gl@3.1.0
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 tileserver-gl

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-15500, inspect your project dependencies using npm:

npm ls tileserver-gl

Analyze the terminal output to locate any version of Tileserver gl in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.1.0), your application is affected.

Note: The npm ls tileserver-gl 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 Tileserver gl, 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

An issue was discovered in server.js in TileServer GL through 3.0.0. The content of the key GET parameter is reflected unsanitized in an HTTP response for the application's main page, causing reflected XSS.

CVE-2020-15500 Affected Tileserver gl Versions

1 component(s)
Fixed Versions:
3.1.0
Product / Package Ecosystem Affected Versions Fixed Version
tileserver-gl
npm/tileserver-gl
npm
< 3.1.0
3.1.0

References

NVD — CVE-2020-15500 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-15500
Tileserver gl Source Repository REPOSITORY
https://github.com/maptiler/tileserver-gl/issues/461
Security Fix Commit FIX COMMIT
https://github.com/maptiler/tileserver-gl/commit/10431d70d0f0d7b7950ae2c02aea0850c7566621
Tileserver gl Source Repository REPOSITORY
https://github.com/maptiler/tileserver-gl
Tileserver gl Security Information SECURITY
http://packetstormsecurity.com/files/162193/Tileserver-gl-3.0.0-Cross-Site-Scripting.html

Frequently Asked Questions

What is CVE-2020-15500?
CVE-2020-15500 is a security vulnerability in Tileserver gl involving Cross-site scripting in TileServer GL under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Tileserver gl versions are affected?
Affected versions include releases prior to 3.1.0 across affected packages: tileserver-gl.
What version fixes CVE-2020-15500?
Upgrading to 3.1.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tileserver-gl affected?
Yes, tileserver-gl is affected in releases prior to 3.1.0. Upgrade your dependency to 3.1.0 or later.
What is the CVSS score of CVE-2020-15500?
CVE-2020-15500 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-2020-15500?
CVE-2020-15500 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-2020-15500?
Run the dependency tree command: 'npm ls tileserver-gl'. 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-3fr8-mwpp-8h9p",
  "modified" : "2023-10-02T20:24:14Z",
  "published" : "2021-05-17T21:01:15Z",
  "aliases" : [ "CVE-2020-15500" ],
  "summary" : "Cross-site scripting in TileServer GL",
  "details" : "An issue was discovered in server.js in TileServer GL through 3.0.0. The content of the key GET parameter is reflected unsanitized in an HTTP response for the application's main page, causing reflected XSS.",
  "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" : "tileserver-gl"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.0.0"
    }
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-15500"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/maptiler/tileserver-gl/issues/461"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/maptiler/tileserver-gl/commit/10431d70d0f0d7b7950ae2c02aea0850c7566621"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/maptiler/tileserver-gl"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/162193/Tileserver-gl-3.0.0-Cross-Site-Scripting.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-11T19:36:26Z",
    "nvd_published_at" : "2020-07-01T23:15:00Z"
  }
}