CVE-2020-7793: Ua parser js Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-394c-5j6w-4xmx
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2020-7793 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Ua parser js libraries in the npm ecosystem. The issue involves ua-parser-js regular expression denial of service vulnerability. Remediation is available by upgrading affected packages to version 0.7.23.

CVE-2020-7793 at a Glance

CVE Identifier CVE-2020-7793
GHSA Identifier GHSA-394c-5j6w-4xmx
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Ua parser js
Package Ecosystem npm
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:N/A:H).

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

How to Fix CVE-2020-7793

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

ua-parser-js fixed: 0.7.23 
npm install ua-parser-js@0.7.23
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 ua-parser-js

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2020-7793, inspect your project dependencies using npm:

npm ls ua-parser-js

Analyze the terminal output to locate any version of Ua parser js in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.7.23), your application is affected.

Note: The npm ls ua-parser-js 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 Ua parser js, 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

The package ua-parser-js before 0.7.23 are vulnerable to Regular Expression Denial of Service (ReDoS) in multiple regexes (see linked commit for more info).

CVE-2020-7793 Affected Ua parser js Versions

1 component(s)
Fixed Versions:
0.7.23
Product / Package Ecosystem Affected Versions Fixed Version
ua-parser-js
npm/ua-parser-js
npm
< 0.7.23
0.7.23

References

NVD — CVE-2020-7793 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-7793
Security Fix Commit FIX COMMIT
https://github.com/faisalman/ua-parser-js/commit/6d1f26df051ba681463ef109d36c9cf0f7e32b18
cert-portal.siemens.com/productcert/pdf/ssa... WEB
https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
snyk.io/vuln/snyk-java-orgw... WEB
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBFAISALMAN-1050388
snyk.io/vuln/snyk-java-orgw... WEB
https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1050387
snyk.io/vuln/snyk-js-uapars... WEB
https://snyk.io/vuln/SNYK-JS-UAPARSERJS-1023599

Frequently Asked Questions

What is CVE-2020-7793?
CVE-2020-7793 is a security vulnerability in Ua parser js involving ua-parser-js Regular Expression Denial of Service vulnerability under CWE-400: Uncontrolled Resource Consumption.
Which Ua parser js versions are affected?
Affected versions include releases prior to 0.7.23 across affected packages: ua-parser-js.
What version fixes CVE-2020-7793?
Upgrading to 0.7.23 (or the latest patched release for your respective branch) resolves the vulnerability.
Is ua-parser-js affected?
Yes, ua-parser-js is affected in releases prior to 0.7.23. Upgrade your dependency to 0.7.23 or later.
What is the CVSS score of CVE-2020-7793?
CVE-2020-7793 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:N/A:H.
What CWE is associated with CVE-2020-7793?
CVE-2020-7793 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-2020-7793?
Run the dependency tree command: 'npm ls ua-parser-js'. 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-394c-5j6w-4xmx",
  "modified" : "2022-09-14T20:38:16Z",
  "published" : "2022-02-09T22:46:53Z",
  "aliases" : [ "CVE-2020-7793" ],
  "summary" : "ua-parser-js Regular Expression Denial of Service vulnerability",
  "details" : "The package ua-parser-js before 0.7.23 are vulnerable to Regular Expression Denial of Service (ReDoS) in multiple regexes (see linked commit for more info).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "ua-parser-js"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.7.23"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-7793"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/faisalman/ua-parser-js/commit/6d1f26df051ba681463ef109d36c9cf0f7e32b18"
  }, {
    "type" : "WEB",
    "url" : "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBFAISALMAN-1050388"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1050387"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-UAPARSERJS-1023599"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-04-08T21:32:22Z",
    "nvd_published_at" : "2020-12-11T14:15:00Z"
  }
}