CVE-2024-10531

Executive Summary

CVE-2024-10531 is a Missing Authorization vulnerability in the Kognetiks Chatbot for WordPress plugin, affecting all versions up to and including 2.1.7. The flaw resides in the update_assistant() function, which fails to perform a capability check before processing requests. This allows authenticated attackers with Subscriber-level access or higher to modify GPT assistant configurations without proper authorization.

The vulnerability is classified as CWE-862: Missing Authorization and carries a CVSS v3.1 base score of 5.3 (Medium). The attack vector is network-based, requires low complexity, and low privileges, but no user interaction. The primary impact is on integrity, as an attacker can alter assistant data, potentially leading to service disruption or data manipulation.

No public proof-of-concept (PoC) or exploit code is available at this time. The vendor has not released a patch, leaving all installations of the plugin vulnerable.

WordPress Ecosystem Context

This vulnerability is specific to the WordPress plugin ecosystem. The update_assistant() function is part of the plugin's REST API or AJAX handler, which is exposed to authenticated users. The missing capability check means that any user with a valid WordPress account (e.g., Subscriber) can send crafted requests to modify GPT assistants, bypassing intended privilege restrictions.

CVSS Breakdown & Threat Level

Threat Level: Medium. While the CVSS score is moderate, the low privilege requirement (Subscriber) and network-based attack vector make it a practical target for attackers. The lack of a patch increases the risk for unmaintained sites.

Deep Dive & Mechanics

The vulnerability exists in the update_assistant() function, which is likely registered via WordPress AJAX or REST API hooks. The function is intended to allow administrators or editors to update GPT assistant configurations (e.g., model parameters, system prompts, or API keys). However, the code does not include a current_user_can() check or nonce verification to ensure the user has the required capabilities (e.g., manage_options or edit_posts).

Attack Flow:

1. An attacker authenticates as a Subscriber (or higher) on a WordPress site running the vulnerable plugin.
2. The attacker crafts a POST request to the AJAX endpoint (e.g., admin-ajax.php?action=update_assistant) with malicious parameters.
3. The update_assistant() function processes the request without verifying the user's role, allowing the attacker to modify assistant data.
4. The attacker can change assistant behavior, potentially exfiltrating data or disrupting chatbot functionality.

Root Cause: The missing capability check is a classic authorization bypass. The function likely uses wp_ajax_nopriv_* or wp_ajax_* hooks but fails to call current_user_can() or wp_verify_nonce().

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is assumed to be similar to the following (hypothetical reconstruction based on the CVE description):

Vulnerable Code (v2.1.7):

add_action('wp_ajax_update_assistant', 'update_assistant');
add_action('wp_ajax_nopriv_update_assistant', 'update_assistant');

function update_assistant() {
    // Missing capability check
    $assistant_id = sanitize_text_field($_POST['assistant_id']);
    $new_config = $_POST['config'];
    // Update assistant in database
    update_option('kognetiks_assistant_' . $assistant_id, $new_config);
    wp_die();
}

Patched Code (Hypothetical):

add_action('wp_ajax_update_assistant', 'update_assistant');
// Remove nopriv hook to restrict to authenticated users

function update_assistant() {
    // Add capability check
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    // Verify nonce
    if (!wp_verify_nonce($_POST['_wpnonce'], 'update_assistant_nonce')) {
        wp_die('Nonce verification failed', 403);
    }
    $assistant_id = sanitize_text_field($_POST['assistant_id']);
    $new_config = $_POST['config'];
    // Update assistant in database
    update_option('kognetiks_assistant_' . $assistant_id, $new_config);
    wp_die();
}

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• WordPress site with Kognetiks Chatbot plugin v2.1.7 or earlier.
• Valid user account with Subscriber role (or higher).

Exploitation Steps:

1. Log in as a Subscriber user.
2. Obtain a valid nonce (if required) by inspecting the plugin's JavaScript or by using a tool like Burp Suite.
3. Send a crafted POST request to wp-admin/admin-ajax.php:

curl -X POST http://target.com/wp-admin/admin-ajax.php \
  -d "action=update_assistant&assistant_id=1&config[model]=gpt-4&config[prompt]=malicious_prompt" \
  --cookie "wordpress_logged_in_xxx=..."

4. Verify the assistant configuration has been changed by checking the chatbot's behavior or querying the database.

Expected Outcome: The attacker can modify any GPT assistant's configuration, potentially injecting malicious prompts or changing API endpoints.

Blue Team (Detection & Hardening)

Detection:

• Monitor AJAX requests to admin-ajax.php with action=update_assistant from low-privilege users.
• Look for unusual changes to kognetiks_assistant_* options in the database.
• Alert on failed capability checks (if logging is enabled).

Hardening:

• Apply the hypothetical patch above (add current_user_can('manage_options') check).
• Use a Web Application Firewall (WAF) to block requests to update_assistant from non-admin users.
• Restrict access to admin-ajax.php via .htaccess or server configuration for low-privilege roles.

Indicators of Compromise (IOCs)

• Network: POST requests to /wp-admin/admin-ajax.php with action=update_assistant and assistant_id parameter.
• Logs: WordPress debug log entries showing update_assistant function calls from unexpected user roles.
• Database: Modified kognetiks_assistant_* options in wp_options table.
• File: Unauthorized changes to plugin files (if the attacker uploads a backdoor).

Detection Engineering

YARA Rule

rule CVE_2024_10531_Kognetiks_Chatbot {
    meta:
        description = "Detects exploitation attempts for CVE-2024-10531 in Kognetiks Chatbot plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2024-10531"
    strings:
        $ajax_action = "update_assistant"
        $wp_ajax = "wp_ajax_update_assistant"
        $nopriv = "wp_ajax_nopriv_update_assistant"
    condition:
        any of them
}

Sigma Rule

title: CVE-2024-10531 - Kognetiks Chatbot Missing Authorization
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthorized update_assistant AJAX requests from low-privilege users
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access_log
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=update_assistant'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-10531 - Kognetiks Chatbot Missing Authorization"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=update_assistant"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released by the vendor.
2. Restrict user roles: Remove Subscriber accounts or limit their capabilities using a plugin like "User Role Editor".
3. Apply virtual patching: Use a WAF to block requests to admin-ajax.php with action=update_assistant from non-admin IPs.

Long-term Fix:

• The vendor must release a patched version that adds current_user_can('manage_options') and nonce verification to the update_assistant() function.
• Alternatively, fork the plugin and apply the patch manually.

Workarounds:

• Add the following code to the theme's functions.php to block unauthorized access:

add_action('wp_ajax_update_assistant', function() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
}, 1);

Valters IT
DevSecOps & Cyber Threat Intelligence