CVE-2023-48286

Executive Summary

CVE-2023-48286 is a critical Missing Authorization vulnerability in the WordPress plugin "Stripe Payments" by mra13, affecting versions up to and including 2.0.79. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive payment data and administrative functions. The vulnerability carries a CVSS score of 8.2 (High), with a vector emphasizing network-based, low-complexity exploitation without authentication. As of the latest intelligence, no official patch has been released, and no public proof-of-concept (PoC) code is available. The EPSS score is 0.0%, indicating low exploitation activity in the wild, but the risk remains significant due to the nature of the affected component (payment processing).

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users are advised to monitor the plugin's page for updates and consider disabling the plugin if no patch is available. The lack of OSV or GitHub advisory data suggests limited open-source visibility, increasing reliance on vendor communication.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
• Base Score: 8.2 (High)
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No victim action required.
• Scope: Unchanged (S:U) – Vulnerability affects only the vulnerable component.
• Confidentiality Impact: High (C:H) – Potential exposure of sensitive payment data.
• Integrity Impact: High (I:H) – Potential unauthorized modification of payment settings or transactions.
• Availability Impact: None (A:N) – No direct denial-of-service impact.

Threat Level: High. The combination of network exploitability, no authentication, and high impact on confidentiality and integrity makes this a critical risk for any site using the vulnerable plugin.

Deep Dive & Mechanics

The vulnerability resides in the stripe-payments WordPress plugin, specifically in the authorization checks for administrative actions. The plugin fails to properly validate user capabilities before executing sensitive operations, such as viewing transaction logs, modifying payment settings, or accessing customer data. This is a classic Missing Authorization (CWE-862) issue, where the plugin relies on incorrect or absent access control checks.

Root Cause Analysis:

• The plugin likely uses current_user_can() or similar WordPress capability checks inconsistently or not at all for certain AJAX actions or admin pages.
• Attackers can craft HTTP requests to endpoints that should require administrative privileges but are exposed without authentication.
• The vulnerability affects all versions up to 2.0.79, suggesting a long-standing oversight in the plugin's development.

Attack Vector:

• An unauthenticated attacker sends specially crafted HTTP requests to the WordPress site, targeting plugin-specific endpoints (e.g., /wp-admin/admin-ajax.php with specific actions).
• The server processes the request without verifying the user's role, granting unauthorized access to sensitive data or functionality.

Vulnerable vs. Patched Code

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

Vulnerable Code (Example):

// In vulnerable version, no capability check
add_action('wp_ajax_stripe_payments_view_logs', 'stripe_payments_view_logs');
add_action('wp_ajax_nopriv_stripe_payments_view_logs', 'stripe_payments_view_logs'); // Missing nopriv check

function stripe_payments_view_logs() {
    // Process and return logs without authentication
    $logs = get_option('stripe_payments_logs');
    echo json_encode($logs);
    wp_die();
}

Patched Code (Hypothetical):

// Patched version adds capability check
add_action('wp_ajax_stripe_payments_view_logs', 'stripe_payments_view_logs');
// Remove nopriv action to require authentication

function stripe_payments_view_logs() {
    // Check if user has manage_options capability
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $logs = get_option('stripe_payments_logs');
    echo json_encode($logs);
    wp_die();
}

Key Difference: The patched version adds a current_user_can('manage_options') check before processing the request, ensuring only administrators can access the functionality.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress site with the vulnerable plugin (version <= 2.0.79) installed and activated.
• Network access to the target site.

Exploitation Steps:

1. Identify Vulnerable Endpoints: Use a tool like Burp Suite or curl to enumerate AJAX actions. Common actions might include stripe_payments_view_logs, stripe_payments_update_settings, or stripe_payments_export_data.
2. Craft Request: Send a POST request to /wp-admin/admin-ajax.php with the action parameter set to a vulnerable action.

   curl -X POST http://target.com/wp-admin/admin-ajax.php \
        -d "action=stripe_payments_view_logs"
   

3. Analyze Response: If the response contains sensitive data (e.g., transaction logs, API keys), the vulnerability is confirmed.
4. Escalate: Attempt to modify settings or export customer data using similar requests.

Note: No public PoC is available; this is a theoretical exploitation based on the vulnerability description.

Blue Team (Defensive)

Detection:

• Monitor for unusual AJAX requests to /wp-admin/admin-ajax.php with actions related to stripe_payments from unauthenticated users.
• Look for HTTP 200 responses to such requests without prior authentication.

Hunting:

• Search web server logs for patterns like POST /wp-admin/admin-ajax.php with action=stripe_payments_* and no preceding login.
• Use the Sigma rule provided in Detection Engineering to identify suspicious activity.

Mitigation:

• Immediately disable the plugin if no patch is available.
• Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to plugin-specific AJAX actions.
• Monitor for any unauthorized access to payment data.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP POST requests to /wp-admin/admin-ajax.php with action parameter containing stripe_payments_ (e.g., stripe_payments_view_logs, stripe_payments_export_data).
  • Requests from IP addresses not associated with known administrators.
• File IOCs:
  • Modified plugin files in /wp-content/plugins/stripe-payments/ (e.g., altered PHP files).
  • Unexpected log files or database entries containing payment data.
• Behavioral IOCs:
  • Unusual access to WordPress admin pages without proper authentication.
  • Sudden changes to payment settings or transaction records.

Detection Engineering

YARA Rule

rule CVE_2023_48286_Stripe_Payments_Missing_Auth {
    meta:
        description = "Detects exploitation attempts for CVE-2023-48286 in Stripe Payments plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2023-48286"
    strings:
        $ajax_action = /action=stripe_payments_[a-z_]+/
        $admin_ajax = /\/wp-admin\/admin-ajax\.php/
        $unauth_access = /HTTP\/1\.1\" 200/
    condition:
        $admin_ajax and $ajax_action and #unauth_access > 0
}

Sigma Rule

title: CVE-2023-48286 Stripe Payments Missing Authorization Exploitation
id: 8a4b3c2d-1e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects unauthenticated AJAX requests targeting Stripe Payments plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: '/wp-admin/admin-ajax.php'
        cs-uri-query|contains: 'action=stripe_payments_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: high

Suricata Rule

alert http any any -> any any (
    msg:"CVE-2023-48286 Stripe Payments Missing Authorization Exploitation";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=stripe_payments_"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
    reference:cve,2023-48286;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the Plugin: If the plugin is not critical, deactivate and delete it immediately.
2. Isolate Affected Systems: If the plugin is essential, isolate the WordPress instance from the internet until a patch is applied.
3. Review Logs: Check web server and WordPress logs for any signs of exploitation.

Long-Term Fixes:

• Vendor Patch: Await an official update from mra13. Monitor the WordPress plugin repository for version 2.0.80 or higher.
• Custom Patching: If you have development resources, apply the hypothetical fix described in the Vulnerable vs. Patched Code section.
• Alternative Plugin: Consider switching to a more actively maintained Stripe payment plugin.

Compensating Controls:

• WAF Rules: Block unauthenticated requests to /wp-admin/admin-ajax.php with action parameters containing stripe_payments_.
• Network Segmentation: Place the WordPress server behind a reverse proxy that enforces authentication for admin endpoints.
• Monitoring: Implement the Sigma and Suricata rules provided to detect exploitation attempts.

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.