CVE-2024-28234: Contao Insufficient BBCode Sanitizer Vulnerability

MODERATE
Advisory Identifier: GHSA-j55w-hjpj-825g
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CVSS 4.3
CWE-74
Published
Advisory Summary

CVE-2024-28234 is a MODERATE (CVSS 4.3) insufficient bbcode sanitizer vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')) affecting Contao libraries in the Packagist ecosystem. The issue involves insufficient bbcode sanitizer. Remediation is available by upgrading affected packages to version 4.13.40, 5.3.4.

CVE-2024-28234 at a Glance

CVE Identifier CVE-2024-28234
GHSA Identifier GHSA-j55w-hjpj-825g
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Affected Product Contao
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 4.3

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:N/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 None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2024-28234

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

contao/comments-bundle fixed: 4.13.40 
Upgrade contao/comments-bundle to 4.13.40
contao/comments-bundle fixed: 5.3.4 
Upgrade contao/comments-bundle to 5.3.4
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 contao/comments-bundle

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-28234, inspect your project dependencies for Contao:

inspect dependencies for contao/comments-bundle

Analyze the terminal output to locate any version of Contao in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.13.40), 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-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), where the product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. In Contao, 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 If BBCode is enabled for comments, users can inject CSS styles. ### Patches Update to Contao 4.13.40 or 5.3.4. ### Workarounds Disable BBCode for comments. ### References https://contao.org/en/security-advisories/insufficient-bbcode-sanitization ### For more information If you have any questions or comments about this advisory, open an issue in [contao/contao](https://github.com/contao/contao/issues/new/choose).

CVE-2024-28234 Affected Contao Versions

2 component(s)
Fixed Versions:
4.13.405.3.4
Product / Package Ecosystem Affected Versions Fixed Version
contao/comments-bundle
 Packagist
≥ 2.0.0
< 4.13.40
4.13.40
contao/comments-bundle
 Packagist
≥ 5.0.0-RC1
< 5.3.4
5.3.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/contao/contao/security/advisories/GHSA-j55w-hjpj-825g
NVD — CVE-2024-28234 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-28234
Security Fix Commit FIX COMMIT
https://github.com/contao/contao/commit/55b995d8d35da0d36bc6a22c53fe6423ab0c4ae2
Security Fix Commit FIX COMMIT
https://github.com/contao/contao/commit/6d42e667177c972ae7c219645593c262d7764ce2
Contao Security Information SECURITY
https://contao.org/en/security-advisories/insufficient-bbcode-sanitization
Contao Source Repository REPOSITORY
https://github.com/contao/contao

Frequently Asked Questions

What is CVE-2024-28234?
CVE-2024-28234 is a security vulnerability in Contao involving Insufficient BBCode sanitizer under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection').
Which Contao versions are affected?
Affected versions include releases prior to 4.13.40, 5.3.4 across affected packages: contao/comments-bundle.
What version fixes CVE-2024-28234?
Upgrading to 4.13.40, 5.3.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is contao/comments-bundle affected?
Yes, contao/comments-bundle is affected in releases prior to 4.13.40, 5.3.4. Upgrade your dependency to 4.13.40, 5.3.4 or later.
What is the CVSS score of CVE-2024-28234?
CVE-2024-28234 has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
What CWE is associated with CVE-2024-28234?
CVE-2024-28234 is classified under CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.).
How can I check Packagist dependencies for CVE-2024-28234?
Run the dependency tree command: 'inspect dependencies for contao/comments-bundle'. 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-j55w-hjpj-825g",
  "modified" : "2024-04-09T18:52:54Z",
  "published" : "2024-04-09T18:52:54Z",
  "aliases" : [ "CVE-2024-28234" ],
  "summary" : "Contao: Insufficient BBCode sanitizer",
  "details" : "### Impact\n\nIf BBCode is enabled for comments, users can inject CSS styles.\n\n### Patches\n\nUpdate to Contao 4.13.40 or 5.3.4.\n\n### Workarounds\n\nDisable BBCode for comments.\n\n### References\n\nhttps://contao.org/en/security-advisories/insufficient-bbcode-sanitization\n\n### For more information\n\nIf you have any questions or comments about this advisory, open an issue in [contao/contao](https://github.com/contao/contao/issues/new/choose).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/comments-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "4.13.40"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "contao/comments-bundle"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "5.0.0-RC1"
      }, {
        "fixed" : "5.3.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/security/advisories/GHSA-j55w-hjpj-825g"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-28234"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/commit/55b995d8d35da0d36bc6a22c53fe6423ab0c4ae2"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/contao/contao/commit/6d42e667177c972ae7c219645593c262d7764ce2"
  }, {
    "type" : "WEB",
    "url" : "https://contao.org/en/security-advisories/insufficient-bbcode-sanitization"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/contao/contao"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-74" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-09T18:52:54Z",
    "nvd_published_at" : "2024-04-09T14:15:08Z"
  }
}