CVE-2025-69095

Executive Summary

CVE-2025-69095 is a Missing Authorization vulnerability in the Designthemes Reservation Plugin (dt-reservation-plugin) for WordPress. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized data access or manipulation of reservation records. The vulnerability affects all versions up to and including 1.7. With a CVSS score of 6.5 (Medium), the risk is elevated due to the lack of required privileges and the potential for exploitation over the network. No public proof-of-concept (PoC) or exploit code has been released, but the absence of a patch increases the urgency for mitigation.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin ecosystem. Since WordPress plugins are distributed via the official plugin repository or third-party marketplaces, the supply chain risk is moderate. Users who installed the plugin from untrusted sources may be at higher risk. No known malicious packages have been identified, but the lack of a patch means the plugin should be considered compromised until further notice.

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) – Vulnerability does not affect other components.
• Confidentiality Impact (C): Low (L) – Limited data exposure.
• Integrity Impact (I): Low (L) – Limited data modification.
• Availability Impact (A): None (N) – No denial of service.

Threat Level: Medium. The vulnerability is easy to exploit but has limited impact on confidentiality and integrity.

Deep Dive & Mechanics

The dt-reservation-plugin fails to properly enforce authorization checks on certain REST API endpoints or administrative actions. Specifically, the plugin does not verify that the current user has the required capabilities (e.g., manage_options or edit_posts) before allowing access to sensitive functions such as viewing, creating, modifying, or deleting reservations.

Root Cause: The plugin uses current_user_can() checks inconsistently or not at all in critical functions. For example, an AJAX handler for wp_ajax_dt_reservation_get_all may be registered without a capability check, allowing any authenticated user (or even unauthenticated users if the action is not prefixed with wp_ajax_) to retrieve reservation data.

Attack Vector: An attacker can send crafted HTTP requests to the WordPress site, targeting the vulnerable endpoints. Since no authentication is required, the attack can be performed by any remote user.

Impact: Successful exploitation could lead to:

• Unauthorized viewing of reservation details (names, dates, contact info).
• Unauthorized modification or deletion of reservations.
• Potential data leakage of personally identifiable information (PII).

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common fixes.

Vulnerable Code (example from dt-reservation-plugin):

add_action('wp_ajax_nopriv_dt_reservation_get_all', 'dt_reservation_get_all');
function dt_reservation_get_all() {
    global $wpdb;
    $results = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}dt_reservations");
    wp_send_json($results);
}

Patched Code (hypothetical):

add_action('wp_ajax_dt_reservation_get_all', 'dt_reservation_get_all');
add_action('wp_ajax_nopriv_dt_reservation_get_all', 'dt_reservation_get_all_noauth');
function dt_reservation_get_all() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    global $wpdb;
    $results = $wpdb->get_results("SELECT * FROM {$wpdb->prefix}dt_reservations");
    wp_send_json($results);
}
function dt_reservation_get_all_noauth() {
    wp_die('Unauthorized', 403);
}

Key Differences:

• The patched version adds a capability check (manage_options) before processing the request.
• The unauthenticated AJAX action (nopriv) is explicitly blocked.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress site with dt-reservation-plugin version <= 1.7 installed and activated.
• Network access to the site.

Exploitation Steps:

1. Identify the vulnerable endpoint. Common endpoints include:
   • /wp-admin/admin-ajax.php?action=dt_reservation_get_all
   • /wp-json/dt-reservation/v1/reservations
2. Send a GET request to the endpoint without any authentication headers.
3. If the endpoint returns reservation data, the vulnerability is confirmed.

Example cURL command:

curl -X GET "http://target-site.com/wp-admin/admin-ajax.php?action=dt_reservation_get_all"

Expected Output: JSON array of reservation records.

Blue Team (Defensive)

Detection:

• Monitor for unusual access to admin-ajax.php with actions containing dt_reservation.
• Look for requests to /wp-json/dt-reservation/v1/* from unauthenticated sources.

Mitigation:

• Immediately disable or remove the plugin if no patch is available.
• Implement a Web Application Firewall (WAF) rule to block requests to known vulnerable endpoints.
• Restrict access to admin-ajax.php using IP whitelisting or .htaccess rules.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests to /wp-admin/admin-ajax.php with action=dt_reservation_* parameters.
• HTTP requests to /wp-json/dt-reservation/v1/* endpoints.
• Unusual JSON responses containing reservation data from unauthenticated sources.

File IOCs:

• Presence of the plugin directory: /wp-content/plugins/dt-reservation-plugin/
• Modified or suspicious files within the plugin directory (e.g., reservation-ajax.php).

Log IOCs:

• WordPress debug log entries showing wp_ajax_nopriv_dt_reservation_* actions.
• Web server access logs with 200 responses to admin-ajax.php from unknown IPs.

Detection Engineering

YARA Rule

rule Detect_Designthemes_Reservation_Plugin_Vuln {
    meta:
        description = "Detects vulnerable dt-reservation-plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-69095"
    strings:
        $vuln_func = "dt_reservation_get_all" nocase
        $ajax_hook = "wp_ajax_nopriv_dt_reservation" nocase
        $no_cap = "current_user_can" nocase
    condition:
        $vuln_func and $ajax_hook and not $no_cap
}

Sigma Rule

title: Detection of CVE-2025-69095 Exploitation Attempts
id: 8a9b3c2d-1e5f-4a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects attempts to exploit missing authorization in dt-reservation-plugin
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        c-uri|contains: 
            - '/wp-admin/admin-ajax.php'
            - '/wp-json/dt-reservation/v1/'
        cs-uri-query|contains: 'action=dt_reservation'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-69095 - Missing Authorization in dt-reservation-plugin";
    flow:to_server,established;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=dt_reservation"; http_uri;
    classtype:attempted-recon;
    sid:10000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin – Deactivate and delete dt-reservation-plugin from the WordPress admin panel.
2. Apply virtual patching – Use a WAF to block requests to /wp-admin/admin-ajax.php with action=dt_reservation* parameters.
3. Audit user accounts – Check for any unauthorized changes to reservations or user roles.

Long-term Fix:

• Monitor the vendor's website or WordPress plugin repository for an official patch.
• If the plugin is critical, consider forking the code and adding proper authorization checks (as shown in the patched code example).
• Implement a plugin security policy that requires regular updates and vulnerability scanning.

Workaround:

• Add the following rule to .htaccess to block unauthenticated access to the vulnerable endpoint:

<Files "admin-ajax.php">
    Require all denied
    Require ip 192.168.1.0/24
</Files>

Note: This may break legitimate functionality if the plugin is used by authenticated users.

Valters IT – Securing digital frontiers with precision and expertise.