CVE-2021-31778: Amazing/media2click Cross-Site Scripting Vulnerability

MODERATE
Advisory Identifier: GHSA-xpxm-pf7g-2534
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CVSS 6.4
CWE-79
Published
Advisory Summary

CVE-2021-31778 is a MODERATE (CVSS 6.4) cross-site scripting vulnerability (CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) affecting Amazing/media2click libraries in the Packagist ecosystem. The issue involves cross-site scripting in media2click. Remediation is available by upgrading affected packages to version 1.3.3.

CVE-2021-31778 at a Glance

CVE Identifier CVE-2021-31778
GHSA Identifier GHSA-xpxm-pf7g-2534
Severity MODERATE
CVSS v3.1 Base Score 6.4
CWE Classification CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected Product Amazing/media2click
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 6.4

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2021-31778

To remediate this vulnerability, upgrade all affected Amazing/media2click dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

amazing/media2click fixed: 1.3.3 
Upgrade amazing/media2click to 1.3.3
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 amazing/media2click

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-31778, inspect your project dependencies for Amazing/media2click:

inspect dependencies for amazing/media2click

Analyze the terminal output to locate any version of Amazing/media2click in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.3.3), 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 Amazing/media2click, 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 media2click (aka 2 Clicks for External Media) extension 1.x before 1.3.3 for TYPO3 allows XSS by a backend user account.

CVE-2021-31778 Affected Amazing/media2click Versions

1 component(s)
Fixed Versions:
1.3.3
Product / Package Ecosystem Affected Versions Fixed Version
amazing/media2click
 Packagist
≥ 1.0.0
< 1.3.3
1.3.3

References

NVD — CVE-2021-31778 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31778
Security Fix Commit FIX COMMIT
https://github.com/ghermens/media2click/commit/3c4e413fbc7d35c47212e754c24d5070637a11a3
packagist.org/packages/amazing/me... WEB
https://packagist.org/packages/amazing/media2click
Amazing/media2click Security Information SECURITY
https://typo3.org/security/advisory/typo3-ext-sa-2021-004

Frequently Asked Questions

What is CVE-2021-31778?
CVE-2021-31778 is a security vulnerability in Amazing/media2click involving Cross-site scripting in media2click under CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting').
Which Amazing/media2click versions are affected?
Affected versions include releases prior to 1.3.3 across affected packages: amazing/media2click.
What version fixes CVE-2021-31778?
Upgrading to 1.3.3 (or the latest patched release for your respective branch) resolves the vulnerability.
Is amazing/media2click affected?
Yes, amazing/media2click is affected in releases prior to 1.3.3. Upgrade your dependency to 1.3.3 or later.
What is the CVSS score of CVE-2021-31778?
CVE-2021-31778 has a CVSS v3.1 base score of 6.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
What CWE is associated with CVE-2021-31778?
CVE-2021-31778 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-2021-31778?
Run the dependency tree command: 'inspect dependencies for amazing/media2click'. 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-xpxm-pf7g-2534",
  "modified" : "2021-05-03T16:41:32Z",
  "published" : "2021-06-08T20:11:52Z",
  "aliases" : [ "CVE-2021-31778" ],
  "summary" : "Cross-site scripting in media2click",
  "details" : "The media2click (aka 2 Clicks for External Media) extension 1.x before 1.3.3 for TYPO3 allows XSS by a backend user account.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "amazing/media2click"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.3.3"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-31778"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/ghermens/media2click/commit/3c4e413fbc7d35c47212e754c24d5070637a11a3"
  }, {
    "type" : "WEB",
    "url" : "https://packagist.org/packages/amazing/media2click"
  }, {
    "type" : "WEB",
    "url" : "https://typo3.org/security/advisory/typo3-ext-sa-2021-004"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-03T16:41:32Z",
    "nvd_published_at" : "2021-04-28T07:15:00Z"
  }
}