CVE-2018-20164: Uap core Denial of Service Vulnerability

MODERATE
Advisory Identifier: GHSA-fx7m-j728-mjw3
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CVSS 5.3
CWE-185
Published
Advisory Summary

CVE-2018-20164 is a MODERATE (CVSS 5.3) denial of service vulnerability (CWE-185: Incorrect Regular Expression) affecting Uap core libraries in the npm ecosystem. The issue involves uap-core regular expression denial of service issue. Remediation is available by upgrading affected packages to version 0.6.0.

CVE-2018-20164 at a Glance

CVE Identifier CVE-2018-20164
GHSA Identifier GHSA-fx7m-j728-mjw3
Severity MODERATE
CVSS v3.1 Base Score 5.3
CWE Classification CWE-185: Incorrect Regular Expression
Affected Product Uap core
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

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 Low (A:L)

How to Fix CVE-2018-20164

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

uap-core fixed: 0.6.0 
npm install uap-core@0.6.0
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 uap-core

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2018-20164, inspect your project dependencies using npm:

npm ls uap-core

Analyze the terminal output to locate any version of Uap core in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.6.0), your application is affected.

Note: The npm ls uap-core 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-185: Incorrect Regular Expression, where the product specifies a regular expression in a way that causes data to be improperly matched or compared. In Uap core, 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 regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The UAP-Core project contains the vulnerability, propagating to all implementations.)

CVE-2018-20164 Affected Uap core Versions

1 component(s)
Fixed Versions:
0.6.0
Product / Package Ecosystem Affected Versions Fixed Version
uap-core
npm/uap-core
npm
< 0.6.0
0.6.0

References

NVD — CVE-2018-20164 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-20164
Uap core Source Repository REPOSITORY
https://github.com/ua-parser/uap-core/issues/332
Security Fix Commit FIX COMMIT
https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014
Security Fix Commit FIX COMMIT
https://github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadc
Uap core Source Repository REPOSITORY
https://github.com/ua-parser/uap-core
www.x41-dsec.de/lab/advisories/x41-... WEB
https://www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser

Frequently Asked Questions

What is CVE-2018-20164?
CVE-2018-20164 is a security vulnerability in Uap core involving uap-core Regular Expression Denial of Service issue under CWE-185: Incorrect Regular Expression.
Which Uap core versions are affected?
Affected versions include releases prior to 0.6.0 across affected packages: uap-core.
What version fixes CVE-2018-20164?
Upgrading to 0.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is uap-core affected?
Yes, uap-core is affected in releases prior to 0.6.0. Upgrade your dependency to 0.6.0 or later.
What is the CVSS score of CVE-2018-20164?
CVE-2018-20164 has a CVSS v3.1 base score of 5.3 (MODERATE) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2018-20164?
CVE-2018-20164 is classified under CWE-185: Incorrect Regular Expression (The product specifies a regular expression in a way that causes data to be improperly matched or compared.).
How can I check npm dependencies for CVE-2018-20164?
Run the dependency tree command: 'npm ls uap-core'. 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-fx7m-j728-mjw3",
  "modified" : "2023-01-23T17:07:55Z",
  "published" : "2019-03-06T17:35:47Z",
  "aliases" : [ "CVE-2018-20164" ],
  "summary" : "uap-core Regular Expression Denial of Service issue",
  "details" : "An issue was discovered in regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The UAP-Core project contains the vulnerability, propagating to all implementations.)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "uap-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-20164"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ua-parser/uap-core/issues/332"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ua-parser/uap-core"
  }, {
    "type" : "WEB",
    "url" : "https://www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-185" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2020-06-16T21:35:45Z",
    "nvd_published_at" : null
  }
}