CVE-2021-41467: Hjue/justwriting Cross-Site Scripting Vulnerability

MODERATE

Advisory Identifier: GHSA-gxmc-5wj3-jx64

CVSS 6.1

Published 2021-10-04

Advisory Summary

CVE-2021-41467 is a MODERATE (CVSS 6.1) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Hjue/justwriting libraries in the Packagist ecosystem. The issue involves cross-site scripting in application/controllers/dropbox.php in justwriting. Remediation is available in the latest vendor maintenance releases.

CVE-2021-41467 at a Glance

CVE Identifier CVE-2021-41467

GHSA Identifier GHSA-gxmc-5wj3-jx64

Severity MODERATE

CVSS v3.1 Base Score 6.1

CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Product Hjue/justwriting

Package Ecosystem Packagist

Published Date 2021-10-04

Last Updated 2021-10-05

Security Impact

CVSS: 6.1

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:C/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 Changed (S:C)

Confidentiality Low (C:L)

Integrity Low (I:L)

Availability None (A:N)

How to Fix CVE-2021-41467

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

hjue/justwriting fixed: Latest secure release

Upgrade hjue/justwriting to Latest secure release

Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release:

inspect dependencies for hjue/justwriting

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-41467, inspect your project dependencies for Hjue/justwriting:

inspect dependencies for hjue/justwriting

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

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), where the product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. In Hjue/justwriting, 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

Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.

CVE-2021-41467 Affected Hjue/justwriting Versions

1 component(s)

Product / Package	Ecosystem	Affected Versions	Fixed Version
hjue/justwriting	Packagist	≤ 1.0.0

References

NVD — CVE-2021-41467 NVD

https://nvd.nist.gov/vuln/detail/CVE-2021-41467

Hjue/justwriting Source Repository REPOSITORY

https://github.com/hjue/JustWriting/issues/106

Hjue/justwriting Source Repository REPOSITORY

https://github.com/hjue/JustWriting

Frequently Asked Questions

What is CVE-2021-41467?

CVE-2021-41467 is a security vulnerability in Hjue/justwriting involving Cross-site scripting in application/controllers/dropbox.php in JustWriting under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').

Which Hjue/justwriting versions are affected?

Affected versions include releases prior to current release patches across affected packages: hjue/justwriting.

What version fixes CVE-2021-41467?

Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.

Is hjue/justwriting affected?

Yes, hjue/justwriting is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.

What is the CVSS score of CVE-2021-41467?

CVE-2021-41467 has a CVSS v3.1 base score of 6.1 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

What CWE is associated with CVE-2021-41467?

CVE-2021-41467 is classified under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') (The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.).

How can I check Packagist dependencies for CVE-2021-41467?

Run the dependency tree command: 'inspect dependencies for hjue/justwriting'. 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-gxmc-5wj3-jx64",
  "modified" : "2021-10-05T16:02:20Z",
  "published" : "2021-10-04T20:13:25Z",
  "aliases" : [ "CVE-2021-41467" ],
  "summary" : "Cross-site scripting in application/controllers/dropbox.php in JustWriting",
  "details" : "Cross-site scripting (XSS) vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "hjue/justwriting"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.0.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-41467"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/hjue/JustWriting/issues/106"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/hjue/JustWriting"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-10-04T13:46:27Z",
    "nvd_published_at" : "2021-10-01T16:15:00Z"
  }
}

CVSS V3

6.1 MODERATE