CVE-2025-58643

Executive Summary

CVE-2025-58643 is a critical Deserialization of Untrusted Data vulnerability (CWE-502) affecting the Enituretechnology LTL Freight Quotes – Daylight Edition WordPress plugin, versions <= 2.2.7. This vulnerability allows an unauthenticated attacker to perform Object Injection by supplying malicious serialized data to the plugin’s deserialization routines. Successful exploitation can lead to arbitrary code execution, full site compromise, and lateral movement within the hosting environment.

This vulnerability is particularly dangerous because it requires no authentication and can be triggered via HTTP requests. The plugin is widely used in logistics and e-commerce environments, making it a high-value target for ransomware and data theft campaigns. As of this report, no official patch has been released, and no public proof-of-concept (PoC) code is available, but the risk of weaponization remains high.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository and third-party marketplaces. The supply chain risk is elevated because:

• No patch is available, leaving all existing installations vulnerable.
• The plugin is commonly bundled with WooCommerce and other e-commerce platforms, increasing the blast radius.
• Attackers may target the plugin’s update mechanism or inject malicious updates if the vendor’s infrastructure is compromised.

CVSS Breakdown & Threat Level

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score: 9.8 (Critical)

Threat Level: Critical. The combination of network exploitability, no authentication, and full impact makes this a top-priority vulnerability for patching and monitoring.

Deep Dive & Mechanics

The vulnerability exists in the plugin’s handling of serialized PHP objects. The plugin likely uses unserialize() on user-supplied input without proper validation or sanitization. In PHP, unserialize() automatically reconstructs objects and calls magic methods like __wakeup() or __destruct(). An attacker can craft a serialized payload that, when deserialized, triggers arbitrary code execution via gadget chains.

Attack Flow:

1. Attacker identifies a parameter (e.g., data, settings, config) that is passed to unserialize().
2. Attacker crafts a serialized PHP object containing a gadget chain (e.g., using common WordPress or PHP classes like WP_Http_Cookie, Requests_Utility_FilteredIterator, or SplObjectStorage).
3. The payload is sent via HTTP POST/GET to the vulnerable endpoint.
4. The plugin deserializes the payload, triggering the gadget chain and executing arbitrary code (e.g., system("id") or writing a webshell).

Root Cause: The plugin fails to validate or sanitize input before passing it to unserialize(). The use of unserialize() on untrusted data is a well-known anti-pattern.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code pattern is described below. A patched version would replace unserialize() with json_decode() or use a safe deserialization library.

Vulnerable Code (PHP):

// vulnerable.php
$data = $_POST['config'];
$config = unserialize($data); // Unsafe
// ... use $config

Patched Code (Hypothetical):

// patched.php
$data = $_POST['config'];
$config = json_decode($data, true); // Safe
if (json_last_error() !== JSON_ERROR_NONE) {
    die('Invalid input');
}
// ... use $config

Key Differences:

• unserialize() allows object instantiation and magic method calls.
• json_decode() only produces arrays/objects without side effects.
• Input validation (e.g., is_array(), ctype_print()) should be added.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Target running WordPress with LTL Freight Quotes – Daylight Edition <= 2.2.7.
• Identify the vulnerable parameter (e.g., data, settings, config).

Exploitation Steps:

1. Reconnaissance: Scan for the plugin’s presence using Shodan dorks or WPScan.
2. Identify Endpoint: Look for AJAX actions or admin-ajax.php calls that handle serialized data.
3. Craft Payload: Use PHPGGC (PHP Generic Gadget Chains) to generate a payload for a known gadget chain (e.g., WordPress RCE).

   phpggc WordPress/RCE1 system 'id' | base64
   

4. Send Payload:

   curl -X POST http://target/wp-admin/admin-ajax.php \
        -d 'action=ltl_freight_quotes_daylight&data=<base64_encoded_payload>'
   

5. Verify Execution: Check for command output in response or error logs.

Lab Setup:

• Use Docker to spin up a vulnerable WordPress instance:

  docker run -d -p 8080:80 --name wp-vuln wordpress:latest
  # Manually install plugin version 2.2.7
  

• Install PHPGGC: git clone https://github.com/ambionics/phpggc

Blue Team (Defensive)

Detection:

• Monitor for unserialize() calls in PHP error logs.
• Look for base64-encoded payloads in POST parameters.
• Use WAF rules to block serialized PHP objects (e.g., O:, C:, a: patterns).

Hunting:

• Search for files containing unserialize($_POST or unserialize($_GET.
• Check for unexpected files in wp-content/uploads/ or wp-content/plugins/.

Containment:

• Disable the plugin immediately if no patch is available.
• Restrict access to admin-ajax.php via .htaccess or firewall.
• Implement a Web Application Firewall (WAF) rule to block serialized payloads.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests containing O: or C: in POST/GET parameters (serialized PHP objects).
• Base64-encoded strings in data, config, or settings parameters.
• Outbound connections to unknown IPs after exploitation.

File System IOCs:

• Unexpected PHP files in wp-content/uploads/ or wp-content/plugins/ltl-freight-quotes-daylight-edition/.
• Modified .htaccess files with AddType or RewriteRule directives.
• Presence of webshells (e.g., cmd.php, shell.php).

Process IOCs:

• php processes executing with elevated privileges.
• Unusual exec(), system(), or shell_exec() calls in PHP logs.

Detection Engineering

YARA Rule

rule CVE_2025_58643_Deserialization {
    meta:
        description = "Detects serialized PHP objects in HTTP requests targeting LTL Freight Quotes plugin"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-58643"
    strings:
        $serialized = /[OoCc]:\d+:/
        $plugin_path = /ltl-freight-quotes-daylight-edition/
        $vuln_param = /(data|config|settings)=/
    condition:
        $serialized and $plugin_path and $vuln_param
}

Sigma Rule

title: CVE-2025-58643 - Deserialization Attempt on LTL Freight Quotes Plugin
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects HTTP requests containing serialized PHP objects targeting the vulnerable plugin
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'ltl-freight-quotes-daylight-edition'
        cs-uri-query|contains: 
            - 'data='
            - 'config='
            - 'settings='
    filter:
        cs-uri-query|contains: 'O:' or 'C:' or 'a:'
    condition: selection and filter
falsepositives:
    - Legitimate plugin configuration updates (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-58643 - LTL Freight Quotes Deserialization Attempt"; flow:to_server,established; content:"POST"; http_method; content:"ltl-freight-quotes-daylight-edition"; http_uri; pcre:"/(O:|C:|a:\d+:)/Ri"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Implement a WAF rule to block serialized PHP objects (e.g., O:, C:, a: patterns).
3. Monitor logs for exploitation attempts using the provided Sigma/Suricata rules.

Long-Term Fix:

• Replace unserialize() with json_decode() or use a safe deserialization library.
• Add input validation (e.g., is_array(), ctype_print()).
• Apply the principle of least privilege to the web server user.

Workaround:

• If the plugin is critical, restrict access to admin-ajax.php via IP whitelisting or .htaccess:

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

Vendor Communication:

• Contact Enituretechnology for patch status.
• Monitor the WordPress plugin repository for updates.

Valters IT
Senior DevSecOps & Cyber Threat Intelligence Analyst
Report generated: 2025-04-10