CVE-2021-21317: Uap core Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-p4pj-mg4r-x6v4
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CVSS 7.5
CWE-400 CWE-1333
Published
Advisory Summary

CVE-2021-21317 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Uap core libraries in the npm ecosystem. The issue involves denial of service in uap-core. Remediation is available by upgrading affected packages to version 0.11.0.

CVE-2021-21317 at a Glance

CVE Identifier CVE-2021-21317
GHSA Identifier GHSA-p4pj-mg4r-x6v4
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Uap core
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-2021-21317

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: 0.11.0 
npm install uap-core@0.11.0
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-2021-21317, 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 0.11.0), 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. 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

## Impact Some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. ## Patches Please update uap-core to >= v0.11.0 Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.

CVE-2021-21317 Affected Uap core Versions

1 component(s)
Fixed Versions:
0.11.0
Product / Package Ecosystem Affected Versions Fixed Version
uap-core
npm/uap-core
npm
< 0.11.0
0.11.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4
NVD — CVE-2021-21317 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-21317
Security Fix Commit FIX COMMIT
https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c
Uap core Source Repository REPOSITORY
https://github.com/ua-parser/uap-core
www.npmjs.com/package/uap-core WEB
https://www.npmjs.com/package/uap-core

Frequently Asked Questions

What is CVE-2021-21317?
CVE-2021-21317 is a security vulnerability in Uap core involving Denial of Service in uap-core under CWE-400: Uncontrolled Resource Consumption.
Which Uap core versions are affected?
Affected versions include releases prior to 0.11.0 across affected packages: uap-core.
What version fixes CVE-2021-21317?
Upgrading to 0.11.0 (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 0.11.0. Upgrade your dependency to 0.11.0 or later.
What is the CVSS score of CVE-2021-21317?
CVE-2021-21317 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-2021-21317?
CVE-2021-21317 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-2021-21317?
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-p4pj-mg4r-x6v4",
  "modified" : "2024-02-08T22:17:20Z",
  "published" : "2021-02-02T15:46:38Z",
  "aliases" : [ "CVE-2021-21317" ],
  "summary" : "Denial of Service in uap-core",
  "details" : "## Impact\n\nSome regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings.\n\n## Patches\n\nPlease update uap-core to >= v0.11.0\n\nDownstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.",
  "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" : "uap-core"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.11.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-21317"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/ua-parser/uap-core"
  }, {
    "type" : "WEB",
    "url" : "https://www.npmjs.com/package/uap-core"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-1333", "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-02-01T16:57:05Z",
    "nvd_published_at" : "2021-02-16T18:15:00Z"
  }
}