CVE-2023-40609 – This vulnerability allows unauthenticated attac... (How to Fix)

Q: What is the severity of CVE-2023-40609?

CVE-2023-40609 has a CVSS score of 9.8 (CRITICAL). This vulnerability allows unauthenticated attackers to execute arbitrary SQL commands on WordPress sites using the Contact Form 7 Custom Validation plugin. It affects all versions up to 1.1.3, potentially compromising the entire database including sensitive user data.

📋 TL;DR

This vulnerability allows unauthenticated attackers to execute arbitrary SQL commands on WordPress sites using the Contact Form 7 Custom Validation plugin. It affects all versions up to 1.1.3, potentially compromising the entire database including sensitive user data.

💻 Affected Systems

Products:

WordPress Contact Form 7 Custom Validation Plugin

Versions: n/a through 1.1.3

Operating Systems: All

Default Config Vulnerable: ⚠️ Yes

Notes: Affects WordPress installations with the vulnerable plugin enabled. No special configuration required.

📦 What is this software?

Contact Form 7 Custom Validation by Rocklobster

View all CVEs affecting Contact Form 7 Custom Validation →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete database compromise leading to data theft, privilege escalation, and full site takeover via SQL injection.

🟠

Likely Case

Unauthenticated attackers extracting sensitive data like user credentials, personal information, and potentially gaining administrative access.

🟢

If Mitigated

Limited impact if proper input validation and parameterized queries are implemented, but still presents significant risk.

🌐 Internet-Facing: HIGH

🏢 Internal Only: LOW

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

SQL injection vulnerabilities are commonly weaponized. Public exploit details available through security advisories.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.1.4 or later

Vendor Advisory: https://patchstack.com/database/vulnerability/cf7-field-validation/wordpress-contact-form-7-custom-validation-plugin-1-1-3-unauth-sql-injection-vulnerability

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins. 3. Find 'Contact Form 7 Custom Validation'. 4. Click 'Update Now' if available. 5. Alternatively, download version 1.1.4+ from WordPress repository and manually update.

🔧 Temporary Workarounds

Disable Plugin

all

Temporarily disable the vulnerable plugin until patched

wp plugin deactivate cf7-field-validation

Web Application Firewall

all

Implement WAF rules to block SQL injection patterns

🧯 If You Can't Patch

Disable the Contact Form 7 Custom Validation plugin immediately
Implement strict input validation and sanitization for all form fields

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin panel > Plugins > Contact Form 7 Custom Validation version. If version is 1.1.3 or earlier, you are vulnerable.

Check Version:

wp plugin get cf7-field-validation --field=version

Verify Fix Applied:

Verify plugin version is 1.1.4 or later in WordPress admin panel.

📡 Detection & Monitoring

Log Indicators:

Unusual SQL queries in database logs
Multiple failed login attempts from single IP
Unexpected database errors

Network Indicators:

HTTP POST requests with SQL syntax in parameters
Unusual traffic patterns to contact form endpoints

SIEM Query:

source="web_server" AND ("sql" OR "union" OR "select" OR "insert") AND uri_path="/wp-json/cf7-field-validation"

📊 Metadata

CVE ID: CVE-2023-40609

CVSS v3 Score: 9.8 (CRITICAL)

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

CWE: CWE-89

Published: November 6, 2023

Last Updated: November 21, 2024

🔗 References

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🔗 Related Vulnerabilities

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