Vulnerabilities in pkg:npm/koa-remove-trailing-slashes

PACKAGE
Advisory Identifier: GHSA-r773-pmw3-f4mr
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Advisory Summary

CVE-2021-23384 is a MODERATE (CVSS 5.4) open redirect vulnerability (CWE-601: URL Redirection to Untrusted Site ('Open Redirect')) affecting Koa remove trailing slashes libraries in the npm ecosystem. The issue involves open redirect in koa-remove-trailing-slashes. Remediation is available by upgrading affected packages to version 2.0.2.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/koa-remove-trailing-slashes

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/koa-remove-trailing-slashes. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-r773-pmw3-f4mr CVE-2021-23384 MODERATE Open Redirect in koa-remove-trailing-slashes

CVE-2021-23384 at a Glance

CVE Identifier CVE-2021-23384
GHSA Identifier GHSA-r773-pmw3-f4mr
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Affected Product Koa remove trailing slashes
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 5.4

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:U/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 Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-23384

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

koa-remove-trailing-slashes fixed: 2.0.2 
npm install koa-remove-trailing-slashes@2.0.2
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 koa-remove-trailing-slashes

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-23384, inspect your project dependencies using npm:

npm ls koa-remove-trailing-slashes

Analyze the terminal output to locate any version of Koa remove trailing slashes in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.2), your application is affected.

Note: The npm ls koa-remove-trailing-slashes 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-601: URL Redirection to Untrusted Site ('Open Redirect'), where the web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect. In Koa remove trailing slashes, 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 koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as `https://example.com//attacker.example/`). The vulnerable code is in `index.js::removeTrailingSlashes()`, as the web server uses relative URLs instead of absolute URLs.

CVE-2021-23384 Affected Koa remove trailing slashes Versions

1 component(s)
Fixed Versions:
2.0.2
Product / Package Ecosystem Affected Versions Fixed Version
koa-remove-trailing-slashes
npm/koa-remove-trailing-slashes
npm
< 2.0.2
2.0.2

References

NVD — CVE-2021-23384 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-23384
Security Fix Commit FIX COMMIT
https://github.com/vgno/koa-remove-trailing-slashes/commit/e7ce4000e9fe4d957332df1056640a22ebea28ee
Koa remove trailing slashes Source Repository REPOSITORY
https://github.com/vgno/koa-remove-trailing-slashes
Koa remove trailing slashes Source Repository REPOSITORY
https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js#L31
snyk.io/vuln/snyk-js-koarem... WEB
https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708

Frequently Asked Questions

What is CVE-2021-23384?
CVE-2021-23384 is a security vulnerability in Koa remove trailing slashes involving Open Redirect in koa-remove-trailing-slashes under CWE-601: URL Redirection to Untrusted Site ('Open Redirect').
Which Koa remove trailing slashes versions are affected?
Affected versions include releases prior to 2.0.2 across affected packages: koa-remove-trailing-slashes.
What version fixes CVE-2021-23384?
Upgrading to 2.0.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is koa-remove-trailing-slashes affected?
Yes, koa-remove-trailing-slashes is affected in releases prior to 2.0.2. Upgrade your dependency to 2.0.2 or later.
What is the CVSS score of CVE-2021-23384?
CVE-2021-23384 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2021-23384?
CVE-2021-23384 is classified under CWE-601: URL Redirection to Untrusted Site ('Open Redirect') (The web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a redirect.).
How can I check npm dependencies for CVE-2021-23384?
Run the dependency tree command: 'npm ls koa-remove-trailing-slashes'. 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-r773-pmw3-f4mr",
  "modified" : "2023-09-05T23:11:11Z",
  "published" : "2022-02-10T23:47:27Z",
  "aliases" : [ "CVE-2021-23384" ],
  "summary" : "Open Redirect in koa-remove-trailing-slashes",
  "details" : "The package koa-remove-trailing-slashes before 2.0.2 are vulnerable to Open Redirect via the use of trailing double slashes in the URL when accessing the vulnerable endpoint (such as `https://example.com//attacker.example/`). The vulnerable code is in `index.js::removeTrailingSlashes()`, as the web server uses relative URLs instead of absolute URLs.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "koa-remove-trailing-slashes"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.0.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-23384"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vgno/koa-remove-trailing-slashes/commit/e7ce4000e9fe4d957332df1056640a22ebea28ee"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vgno/koa-remove-trailing-slashes"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vgno/koa-remove-trailing-slashes/blame/6a01ba8fd019bd3ece44879c553037ad96ba7d47/index.js#L31"
  }, {
    "type" : "WEB",
    "url" : "https://snyk.io/vuln/SNYK-JS-KOAREMOVETRAILINGSLASHES-1085708"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-19T17:57:27Z",
    "nvd_published_at" : "2021-05-17T18:15:00Z"
  }
}