CVE-2025-68009

Executive Summary

CVE-2025-68009 is a Missing Authorization vulnerability in the Codeless Slider Templates WordPress plugin (versions <= 1.0.3). This flaw allows unauthenticated attackers to access functionality that should be constrained by Access Control Lists (ACLs). The vulnerability is classified as a WordPress ecosystem issue, not related to Apache or Nginx. With a CVSS score of 6.5 (Medium), it poses a moderate risk, enabling unauthorized access to plugin features, potentially leading to data exposure or manipulation. No public proof-of-concept (PoC) or exploit code is available, and the patch status remains unknown.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users are advised to monitor for updates from the vendor (Codeless) and consider removing the plugin if no patch is released. The lack of OSV or GitHub advisory data indicates limited supply chain visibility.

CVSS Breakdown & Threat Level

• CVSS Score: 6.5 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: Low
• Availability Impact: None

The vulnerability is exploitable remotely without authentication, making it accessible to any attacker. The low impact on confidentiality and integrity suggests limited data exposure or modification, but combined with the ease of exploitation, it warrants immediate attention.

Deep Dive & Mechanics

The Codeless Slider Templates plugin provides slider templates for WordPress sites. The missing authorization vulnerability exists in the plugin's AJAX handlers or REST API endpoints, which fail to verify user capabilities before executing sensitive actions. Attackers can send crafted HTTP requests to trigger functions like template import, export, or deletion without proper authentication.

The root cause is the absence of current_user_can() checks or nonce verification in critical functions. This allows unauthenticated users to invoke actions intended for administrators or editors.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is presumed to be in the plugin's main PHP files (e.g., slider-templates.php or includes/class-ajax.php). A typical vulnerable pattern:

// Vulnerable: No capability check
add_action('wp_ajax_nopriv_slider_import', 'slider_import_function');
function slider_import_function() {
    // Process import without checking user permissions
    $data = $_POST['data'];
    // ... import logic
}

A patched version would include:

// Patched: Capability check added
add_action('wp_ajax_slider_import', 'slider_import_function');
function slider_import_function() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    // Process import
    $data = $_POST['data'];
    // ... import logic
}

The key difference is the addition of current_user_can('manage_options') and the removal of wp_ajax_nopriv_ (which allows unauthenticated access).

Exploitation & Lab Setup

Red Team

Prerequisites:

• Target WordPress site with Codeless Slider Templates <= 1.0.3 installed and activated.
• No authentication required.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=slider_import).
2. Send a crafted POST request with malicious data.

curl -X POST http://target.com/wp-admin/admin-ajax.php \
  -d "action=slider_import&data={\"template\":\"malicious_content\"}"

3. Verify unauthorized access by checking if the action executes (e.g., template imported without admin privileges).

Note: No public exploit code exists; this is a conceptual demonstration.

Blue Team

Detection & Response:

• Monitor for unusual AJAX requests to admin-ajax.php with actions related to slider_ (e.g., slider_import, slider_export).
• Alert on requests from unauthenticated users to these endpoints.
• Review server logs for 200 responses to admin-ajax.php without prior authentication.

Honeypot Setup:

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

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /wp-admin/admin-ajax.php with action=slider_* parameters.
  • User-Agent strings not matching typical browsers (e.g., curl/7.x).
• File IOCs:
  • Unexpected template files in /wp-content/uploads/slider-templates/.
  • Modified plugin files (e.g., slider-templates.php).
• Log IOCs:
  • Repeated 200 responses to admin-ajax.php from unauthenticated IPs.
  • Error logs showing wp_die or Unauthorized messages if patched.

Detection Engineering

YARA Rule

rule CVE_2025_68009_Slider_Templates {
    meta:
        description = "Detects exploitation attempts for CVE-2025-68009 in Codeless Slider Templates"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-68009"
    strings:
        $ajax_action = /action=slider_(import|export|delete|update)/ nocase
        $wp_ajax = "admin-ajax.php" nocase
    condition:
        $wp_ajax and $ajax_action
}

Sigma Rule

title: CVE-2025-68009 - Missing Authorization in Codeless Slider Templates
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects unauthenticated AJAX requests to slider template actions
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains|all:
            - 'action=slider_import'
            - 'action=slider_export'
            - 'action=slider_delete'
    condition: selection
falsepositives:
    - Legitimate admin actions (if authenticated)
level: medium

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-68009 - Missing Authorization in Codeless Slider Templates";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"admin-ajax.php"; http_uri;
    content:"action=slider_"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if not essential: Deactivate and delete slider-templates from WordPress admin.
2. Implement Web Application Firewall (WAF) rules to block unauthenticated requests to admin-ajax.php with action=slider_*.
3. Monitor for updates from the vendor (Codeless) and apply patches immediately when available.

Long-term Measures:

• Conduct a security audit of all WordPress plugins for missing authorization.
• Enforce least privilege by ensuring all AJAX actions check current_user_can().
• Use nonces (wp_create_nonce()) to prevent CSRF attacks.

Workaround:

• Add custom code to the theme's functions.php to block unauthenticated slider actions:

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX) {
        $action = $_REQUEST['action'] ?? '';
        if (strpos($action, 'slider_') === 0 && !is_user_logged_in()) {
            wp_die('Unauthorized');
        }
    }
});

Valters IT
Securing Digital Frontiers