CVE-2020-8192: Fastify Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-xw5p-hw6r-2j98
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CWE-400
Published
Advisory Summary

CVE-2020-8192 is a MODERATE denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Fastify libraries in the npm ecosystem. The issue involves denial of service in fastify. Remediation is available by upgrading affected packages to version 2.15.1.

CVE-2020-8192 at a Glance

CVE Identifier CVE-2020-8192
GHSA Identifier GHSA-xw5p-hw6r-2j98
Severity MODERATE
CVSS v3.1 Base Score N/A
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Fastify
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2020-8192

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

fastify fixed: 2.15.1 
npm install fastify@2.15.1
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 fastify

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-8192, inspect your project dependencies using npm:

npm ls fastify

Analyze the terminal output to locate any version of Fastify in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.15.1), your application is affected.

Note: The npm ls fastify 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Fastify, 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

A denial of service vulnerability exists in Fastify v2.14.1 and v3.0.0-rc.4 that allows a malicious user to trigger resource exhaustion (when the allErrors option is used) with specially crafted schemas.

CVE-2020-8192 Affected Fastify Versions

1 component(s)
Fixed Versions:
2.15.1
Product / Package Ecosystem Affected Versions Fixed Version
fastify
npm/fastify
npm
< 2.15.1
2.15.1

References

NVD — CVE-2020-8192 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-8192
Security Fix Commit FIX COMMIT
https://github.com/fastify/fastify/commit/74c3157ca90c3ffed9e4434f63c2017471ec970e
hackerone.com/reports/903521 WEB
https://hackerone.com/reports/903521

Frequently Asked Questions

What is CVE-2020-8192?
CVE-2020-8192 is a security vulnerability in Fastify involving Denial of service in fastify under CWE-400: Uncontrolled Resource Consumption.
Which Fastify versions are affected?
Affected versions include releases prior to 2.15.1 across affected packages: fastify.
What version fixes CVE-2020-8192?
Upgrading to 2.15.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is fastify affected?
Yes, fastify is affected in releases prior to 2.15.1. Upgrade your dependency to 2.15.1 or later.
What CWE is associated with CVE-2020-8192?
CVE-2020-8192 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for CVE-2020-8192?
Run the dependency tree command: 'npm ls fastify'. 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-xw5p-hw6r-2j98",
  "modified" : "2020-08-03T21:25:40Z",
  "published" : "2020-08-05T14:53:22Z",
  "aliases" : [ "CVE-2020-8192" ],
  "summary" : "Denial of service in fastify",
  "details" : "A denial of service vulnerability exists in Fastify v2.14.1 and v3.0.0-rc.4 that allows a malicious user to trigger resource exhaustion (when the allErrors option is used) with specially crafted schemas.",
  "severity" : [ ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "fastify"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.15.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-8192"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/fastify/fastify/commit/74c3157ca90c3ffed9e4434f63c2017471ec970e"
  }, {
    "type" : "WEB",
    "url" : "https://hackerone.com/reports/903521"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-08-03T21:25:40Z",
    "nvd_published_at" : null
  }
}