CVE-2023-3204 – The Materialis WordPress theme has an authoriza... (How to Fix)

Q: What is the severity of CVE-2023-3204?

CVE-2023-3204 has a CVSS score of 6.5 (MEDIUM). The Materialis WordPress theme has an authorization bypass vulnerability that allows authenticated users with minimal permissions (like subscribers) to modify any site option to a numerical value. This occurs because the companion_disable_popup() function lacks proper authorization checks when called via AJAX. WordPress sites using Materialis theme versions up to 1.1.24 are affected.

📋 TL;DR

The Materialis WordPress theme has an authorization bypass vulnerability that allows authenticated users with minimal permissions (like subscribers) to modify any site option to a numerical value. This occurs because the companion_disable_popup() function lacks proper authorization checks when called via AJAX. WordPress sites using Materialis theme versions up to 1.1.24 are affected.

💻 Affected Systems

Products:

Materialis WordPress Theme

Versions: Up to and including 1.1.24

Operating Systems: All

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with Materialis theme active. Any authenticated user can exploit, including subscribers.

📦 What is this software?

Materialis by Extendthemes

View all CVEs affecting Materialis →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could modify critical WordPress options like site URL, admin email, or user roles, potentially taking over the site or causing complete service disruption.

🟠

Likely Case

Attackers modify less critical options to deface the site, redirect users, or enable other vulnerabilities by changing security settings.

🟢

If Mitigated

With proper access controls and monitoring, impact is limited to minor configuration changes that can be quickly reverted.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access but minimal permissions. Public exploit code exists in security advisories.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.1.25 and later

Vendor Advisory: https://themes.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=231816%40materialis&new=231816%40materialis&sfp_email=&sfph_mail=#file6

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Appearance > Themes. 3. Check if Materialis theme update is available. 4. Click 'Update Now' for Materialis theme. 5. Verify theme version is 1.1.25 or higher.

🔧 Temporary Workarounds

Disable vulnerable AJAX endpoint

all

Remove or restrict access to the vulnerable companion_disable_popup() function via .htaccess or WordPress hooks

Add to .htaccess: RewriteRule ^wp-admin/admin-ajax\.php$ - [F] (Note: This breaks all AJAX functionality)

Restrict user registration

all

Temporarily disable new user registration to prevent attackers from obtaining accounts

In WordPress Settings > General, uncheck 'Anyone can register'

🧯 If You Can't Patch

Temporarily switch to a different WordPress theme
Implement strict monitoring of WordPress option changes in database logs

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Appearance > Themes > Materialis theme details for version number

Check Version:

wp theme list --field=name,version --status=active (if WP-CLI installed)

Verify Fix Applied:

Verify Materialis theme version is 1.1.25 or higher in WordPress admin

📡 Detection & Monitoring

Log Indicators:

Unusual option_value changes in wp_options table
AJAX requests to admin-ajax.php with action=companion_disable_popup from low-privilege users

Network Indicators:

POST requests to /wp-admin/admin-ajax.php with specific parameters

SIEM Query:

source="wordpress.log" AND "admin-ajax.php" AND "companion_disable_popup"

📊 Metadata

CVE ID: CVE-2023-3204

CVSS v3 Score: 6.5 (MEDIUM)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CWE: CWE-862

Published: June 20, 2024

Last Updated: November 21, 2024

🔗 References

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