CVE-2023-46147 – This vulnerability allows authenticated attacke... (How to Fix)

Q: What is the severity of CVE-2023-46147?

CVE-2023-46147 has a CVSS score of 7.4 (HIGH). This vulnerability allows authenticated attackers to perform PHP object injection via deserialization of untrusted data in the Themify Ultra WordPress theme. Attackers can execute arbitrary code, potentially leading to complete site compromise. All WordPress sites using Themify Ultra theme versions up to 7.3.5 are affected.

📋 TL;DR

This vulnerability allows authenticated attackers to perform PHP object injection via deserialization of untrusted data in the Themify Ultra WordPress theme. Attackers can execute arbitrary code, potentially leading to complete site compromise. All WordPress sites using Themify Ultra theme versions up to 7.3.5 are affected.

💻 Affected Systems

Products:

Themify Ultra WordPress Theme

Versions: All versions up to and including 7.3.5

Operating Systems: Any OS running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires authenticated user access, but any authenticated user can potentially exploit this vulnerability.

📦 What is this software?

Ultra by Themify

View all CVEs affecting Ultra →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete server takeover with remote code execution, data theft, defacement, and backdoor installation.

🟠

Likely Case

Unauthorized administrative access, plugin/theme manipulation, data exfiltration, and persistence mechanisms.

🟢

If Mitigated

Limited impact if proper authentication controls and input validation are in place, but still significant risk.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploit requires authenticated access but is relatively straightforward for attackers with valid credentials.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 7.3.6 and later

Vendor Advisory: https://themify.me/changelogs/themify-ultra.txt

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Appearance > Themes. 3. Update Themify Ultra theme to version 7.3.6 or later. 4. Clear any caching plugins/CDN caches.

🔧 Temporary Workarounds

Disable vulnerable functionality

all

Temporarily disable or remove the vulnerable component until patching is possible

Restrict user access

all

Limit authenticated user access to only trusted administrators

🧯 If You Can't Patch

Disable the Themify Ultra theme and switch to a secure alternative theme
Implement web application firewall rules to block deserialization attempts

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Appearance > Themes for Themify Ultra version. If version is 7.3.5 or lower, you are vulnerable.

Check Version:

wp theme list --field=name,version --path=/path/to/wordpress | grep themify-ultra

Verify Fix Applied:

Confirm theme version is 7.3.6 or higher in WordPress admin panel > Appearance > Themes.

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to theme files
PHP deserialization errors in logs
Unexpected file uploads or modifications

Network Indicators:

Suspicious serialized data in HTTP requests
Unexpected outbound connections from WordPress server

SIEM Query:

source="wordpress.log" AND ("themify" OR "deserialize" OR "unserialize") AND status=200

📊 Metadata

CVE ID: CVE-2023-46147

CVSS v3 Score: 7.4 (HIGH)

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

CWE: CWE-502

Published: December 20, 2023

Last Updated: November 21, 2024

🔗 References

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