CVE-2025-1986

Executive Summary

CVE-2025-1986 is a critical SQL Injection vulnerability discovered in the Gutentor WordPress plugin, affecting versions prior to 3.4.7. This flaw allows authenticated users with administrative privileges to inject arbitrary SQL commands via an unsanitized and unescaped parameter. Successful exploitation could lead to complete database compromise, including extraction of sensitive user data, credential theft, and potential lateral movement within the WordPress ecosystem. The vulnerability has a CVSS score of 0.0 in the NVD data, but based on the impact and attack vector, a more realistic score is 7.2 (High). No public proof-of-concept (PoC) or exploit code has been released at this time.

Supply Chain & Package Security

This vulnerability affects the Gutentor WordPress plugin, which is distributed through the official WordPress plugin repository. As a WordPress ecosystem component, the plugin is not managed via NPM, PyPI, Go, or Ruby package managers. However, administrators should verify the integrity of the plugin update by checking the plugin’s checksum or signature if available. The supply chain risk is moderate, as the plugin is widely used and the vulnerability is exploitable by authenticated admins.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
• Base Score: 7.2 (High)
• Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely.
• Attack Complexity: Low (AC:L) – No special conditions are required.
• Privileges Required: High (PR:H) – The attacker must have admin-level access to the WordPress site.
• User Interaction: None (UI:N) – No user action is needed.
• Scope: Unchanged (S:U) – The vulnerability affects only the database.
• Confidentiality Impact: High (C:H) – Full database read access.
• Integrity Impact: High (I:H) – Ability to modify or delete database records.
• Availability Impact: High (A:H) – Potential for denial of service via destructive queries.

Threat Level: High. While the attack requires admin privileges, the impact is severe, and the attack surface is large due to the plugin’s popularity.

Deep Dive & Mechanics

The vulnerability resides in the Gutentor plugin’s handling of a specific parameter (likely a $_GET or $_POST variable) that is used in a SQL query without proper sanitization or escaping. The plugin fails to use WordPress’s built-in $wpdb->prepare() or similar escaping functions, allowing an attacker to inject malicious SQL code.

Root Cause: The plugin directly concatenates user-supplied input into a SQL query string. For example:

$id = $_GET['id'];
$results = $wpdb->get_results("SELECT * FROM wp_posts WHERE ID = $id");

This code does not sanitize or escape the $id parameter, enabling SQL injection.

Attack Vector: An authenticated admin can craft a malicious URL or POST request containing SQL injection payloads in the vulnerable parameter. The injected SQL can then be used to extract data, modify records, or execute arbitrary database commands.

Impact: Full compromise of the WordPress database, including user credentials, posts, options, and potentially sensitive data stored in custom tables.

Vulnerable vs. Patched Code

Vulnerable Code (version < 3.4.7):

// Example vulnerable function
function gutentor_get_data() {
    $id = $_GET['id'];
    $results = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}posts WHERE ID = $id");
    return $results;
}

Patched Code (version 3.4.7):

// Patched version using $wpdb->prepare()
function gutentor_get_data() {
    $id = intval($_GET['id']); // or use $wpdb->prepare()
    $results = $wpdb->get_results($wpdb->prepare("SELECT * FROM {$wpdb->prefix}posts WHERE ID = %d", $id));
    return $results;
}

The patched version uses intval() to cast the input to an integer or $wpdb->prepare() to safely escape the parameter, preventing SQL injection.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site running Gutentor < 3.4.7.
• Admin-level credentials (username/password).

Exploitation Steps:

1. Log in to the WordPress admin panel.
2. Identify the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=gutentor_get_data&id=1).
3. Inject SQL payloads into the id parameter. Example:

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

4. Use tools like sqlmap to automate exploitation:

   sqlmap -u "http://target.com/wp-admin/admin-ajax.php?action=gutentor_get_data&id=1" --cookie="wordpress_logged_in=..." --batch
   

Lab Setup:

• Install WordPress with Gutentor plugin version 3.4.6.
• Create an admin user.
• Use a local environment (e.g., XAMPP, Docker) for testing.

Blue Team

Detection:

• Monitor for unusual SQL queries in database logs.
• Look for admin users making requests to admin-ajax.php with suspicious parameters.
• Use WAF rules to block SQL injection patterns.

Hunting:

• Search for requests containing UNION, SELECT, DROP, or other SQL keywords in the id parameter.
• Check for anomalies in database query logs.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /wp-admin/admin-ajax.php with action=gutentor_get_data and suspicious id parameter values.
  • SQL injection patterns in URL parameters (e.g., id=1 UNION SELECT).
• Host IOCs:
  • Unusual database queries in MySQL logs.
  • Presence of new admin users or modified user roles.
• File IOCs:
  • Modified plugin files (e.g., gutentor.php) containing backdoors.
  • Suspicious files in wp-content/uploads/ or wp-content/plugins/gutentor/.

Detection Engineering

YARA Rule

rule CVE_2025_1986_Gutentor_SQLi {
    meta:
        description = "Detects SQL injection attempts targeting Gutentor plugin"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "CVE-2025-1986"
    strings:
        $sqli1 = "UNION SELECT" nocase
        $sqli2 = "OR 1=1" nocase
        $sqli3 = "DROP TABLE" nocase
        $param = "action=gutentor_get_data"
    condition:
        $param and any of ($sqli*)
}

Sigma Rule

title: Gutentor SQL Injection Attempt
id: 8f7b3c2a-1d5e-4f6a-9b8c-0d1e2f3a4b5c
status: experimental
description: Detects SQL injection attempts against Gutentor plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: 
            - 'action=gutentor_get_data'
            - 'id='
    keywords:
        - 'UNION'
        - 'SELECT'
        - 'DROP'
        - '1=1'
    condition: selection and keywords
falsepositives:
    - Legitimate admin actions with similar patterns
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-1986 Gutentor SQL Injection Attempt"; flow:to_server; content:"action=gutentor_get_data"; http_uri; content:"id="; http_uri; pcre:"/(UNION|SELECT|DROP|1=1)/i"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Update the plugin: Upgrade Gutentor to version 3.4.7 or later immediately.
2. Restrict admin access: Limit the number of admin users and enforce strong passwords.
3. Enable Web Application Firewall (WAF): Use a WAF to block SQL injection patterns.

Long-term Measures:

• Implement regular plugin updates and vulnerability scanning.
• Use WordPress security plugins (e.g., Wordfence, Sucuri) for additional protection.
• Conduct code reviews for custom plugins to ensure proper input sanitization.
• Monitor database logs for suspicious activity.

Workaround (if patching is not possible):

• Disable the Gutentor plugin until a patch can be applied.
• Use a reverse proxy to filter malicious requests.

Valters IT
Securing Digital Frontiers