CVE-2023-39312 – This CVE describes a missing authorization vuln... (How to Fix)

Q: What is the severity of CVE-2023-39312?

CVE-2023-39312 has a CVSS score of 9.1 (CRITICAL). This CVE describes a missing authorization vulnerability in the Avada WordPress theme that allows authenticated users with author-level permissions to perform unrestricted ZIP file extraction. Attackers can exploit this to upload malicious files, potentially leading to remote code execution. All WordPress sites using Avada theme versions up to 7.11.1 are affected.

📋 TL;DR

This CVE describes a missing authorization vulnerability in the Avada WordPress theme that allows authenticated users with author-level permissions to perform unrestricted ZIP file extraction. Attackers can exploit this to upload malicious files, potentially leading to remote code execution. All WordPress sites using Avada theme versions up to 7.11.1 are affected.

💻 Affected Systems

Products:

ThemeFusion Avada WordPress Theme

Versions: All versions up to and including 7.11.1

Operating Systems: Any OS running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with Avada theme and at least one user with author-level permissions.

📦 What is this software?

Avada by Theme Fusion

View all CVEs affecting Avada →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete site compromise, data theft, malware distribution, or site defacement.

🟠

Likely Case

Unauthorized file upload leading to backdoor installation, privilege escalation, or content manipulation.

🟢

If Mitigated

Limited impact with proper file upload restrictions and monitoring in place.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires author-level WordPress credentials. Public exploit details available through Patchstack.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 7.11.2 and later

Vendor Advisory: https://patchstack.com/database/vulnerability/avada/wordpress-avada-theme-7-11-1-authenticated-author-unrestricted-zip-extraction-vulnerability

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Appearance > Themes. 3. Update Avada theme to version 7.11.2 or later. 4. Clear any caching plugins or CDN caches.

🔧 Temporary Workarounds

Restrict Author Permissions

all

Temporarily remove or restrict author-level user accounts until patching is complete.

Disable ZIP Uploads

all

Use WordPress security plugins to block ZIP file uploads for author-level users.

🧯 If You Can't Patch

Implement strict file upload restrictions using .htaccess or web server configuration
Enable detailed logging of all file upload activities and monitor for suspicious behavior

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Appearance > Themes > Avada version. If version is 7.11.1 or lower, you are vulnerable.

Check Version:

wp theme list --field=name,version | grep -i avada

Verify Fix Applied:

After updating, verify Avada theme version shows 7.11.2 or higher in WordPress admin.

📡 Detection & Monitoring

Log Indicators:

Unusual ZIP file uploads by author-level users
File extraction operations in theme directories
PHP file creation in uploads directory

Network Indicators:

POST requests to theme-specific endpoints with ZIP files
Unusual outbound connections after file uploads

SIEM Query:

source="wordpress.log" AND ("upload" AND ".zip") AND user_role="author"

📊 Metadata

CVE ID: CVE-2023-39312

CVSS v3 Score: 9.1 (CRITICAL)

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

CWE: CWE-862

Published: June 19, 2024

Last Updated: November 21, 2024

🔗 References

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