CVE-2025-53248

Executive Summary

CVE-2025-53248 is a PHP Local File Inclusion (LFI) vulnerability in the WordPress theme eximious-magazine by Unfoldwp, affecting versions up to and including 1.2.2. 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 (e.g., wp-config.php, /etc/passwd) and potentially remote code execution if combined with file upload capabilities. The CVSS score is 8.1 (High), and no public exploit or patch is currently available. The attack vector is network-based with low complexity and no authentication required.

Supply Chain & Package Security

This vulnerability affects a WordPress theme distributed via the official WordPress theme repository and third-party marketplaces. Users who installed the theme via the WordPress admin dashboard or manually uploaded it are at risk. No known supply chain compromise has been reported, but the lack of a patch increases the risk of malicious actors forking or modifying the theme to include backdoors.

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 victim action required.
• Scope: Unchanged (S:U) – Vulnerability does not affect other components.
• Confidentiality Impact: High (C:H) – Full file read access.
• Integrity Impact: None (I:N) – Cannot modify files directly.
• Availability Impact: None (A:N) – No denial of service.

Threat Level: High. The vulnerability is trivial to exploit and can expose sensitive server configuration files, database credentials, and source code.

Deep Dive & Mechanics

The vulnerability exists in the eximious-magazine WordPress theme, specifically in a PHP function that handles file inclusion for template parts or custom modules. The theme likely uses a parameter (e.g., file, template, or include) in a URL or POST request to dynamically load a PHP file. Due to insufficient sanitization, an attacker can supply a path traversal sequence (e.g., ../../../../etc/passwd) to include arbitrary files from the server.

Root Cause: The theme uses a user-supplied value in a PHP include() or require() statement without proper validation or whitelisting. For example:

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

This allows an attacker to bypass the .php extension by using a null byte injection (in older PHP versions) or by using path traversal to include files without the extension (e.g., ../../../../etc/passwd%00). Modern PHP versions (>=5.3.4) are not vulnerable to null byte injection, but the LFI still works if the attacker can control the full path or if the theme does not append an extension.

Attack Scenario:

1. Attacker identifies a vulnerable endpoint, e.g., http://target/wp-content/themes/eximious-magazine/template.php?file=header.
2. Attacker modifies the file parameter to ../../../../etc/passwd.
3. The server includes the /etc/passwd file, displaying its contents in the HTTP response.

Vulnerable vs. Patched Code

Vulnerable Code (eximious-magazine <= 1.2.2):

// In a template loader function
$template = $_GET['template'];
include( get_template_directory() . '/parts/' . $template . '.php' );

Patched Code (Hypothetical):

// Whitelist allowed templates
$allowed_templates = array('header', 'footer', 'sidebar');
$template = $_GET['template'];
if ( in_array( $template, $allowed_templates ) ) {
    include( get_template_directory() . '/parts/' . $template . '.php' );
} else {
    // Handle error
    wp_die('Invalid template.');
}

Key Differences:

• The patched version uses a whitelist to restrict included files.
• The vulnerable version directly uses user input without validation.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running WordPress with eximious-magazine theme <= 1.2.2.
• PHP version may affect null byte injection, but path traversal works regardless.

Exploit Steps:

1. Identify the vulnerable parameter (e.g., file, template, include). Common endpoints:
   • /wp-content/themes/eximious-magazine/template.php?file=
   • /wp-content/themes/eximious-magazine/inc/loader.php?include=
2. Test with a simple path traversal:

   http://target/wp-content/themes/eximious-magazine/template.php?file=../../../../etc/passwd
   

3. If the server returns the file content, the LFI is confirmed.
4. For sensitive WordPress files:

   http://target/wp-content/themes/eximious-magazine/template.php?file=../../../../wp-config
   

   (Note: The .php extension may be appended; try without extension or use %00 if PHP < 5.3.4.)

Example cURL command:

curl -v "http://target/wp-content/themes/eximious-magazine/template.php?file=../../../../etc/passwd"

No public exploit code is available for this CVE.

Blue Team (Detection & Hardening)

Detection:

• Monitor web server logs for path traversal patterns in file, template, or include parameters.
• Look for requests containing ../ or %2e%2e%2f in the query string.
• Alert on access to sensitive files like /etc/passwd, wp-config.php, or .env.

Hardening:

• Immediately update the theme if a patch becomes available.
• If no patch, disable or replace the theme.
• Implement a Web Application Firewall (WAF) rule to block path traversal attempts.
• Restrict file inclusion via PHP configuration: set allow_url_include = Off and open_basedir to limit accessible directories.

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests with ../ or %2e%2e%2f in parameters like file, template, include.
• Requests to /wp-content/themes/eximious-magazine/ followed by path traversal.
• Outbound connections from the server to attacker-controlled hosts (if RCE is achieved).

File System IOCs:

• Unexpected files in the web root (e.g., shell.php, cmd.php).
• Modified theme files (e.g., functions.php with backdoor code).
• Log entries showing inclusion of /etc/passwd or wp-config.php.

Log Examples:

192.168.1.100 - - [01/Jan/2025:12:00:00 +0000] "GET /wp-content/themes/eximious-magazine/template.php?file=../../../../etc/passwd HTTP/1.1" 200 1234 "-" "Mozilla/5.0"

Detection Engineering

YARA Rule

rule CVE_2025_53248_LFI_WordPress_Theme {
    meta:
        description = "Detects path traversal attempts targeting eximious-magazine theme LFI"
        author = "Valters IT"
        date = "2025-01-01"
        cve = "CVE-2025-53248"
    strings:
        $path_traversal = /(\.\.\/|\.\.\\|%2e%2e%2f|%2e%2e%5c)/ nocase
        $theme_path = /eximious-magazine/i
        $param = /(file|template|include)=/ nocase
    condition:
        $theme_path and $param and $path_traversal
}

Sigma Rule

title: CVE-2025-53248 - WordPress eximious-magazine Theme LFI
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects path traversal in HTTP requests to eximious-magazine theme
author: Valters IT
date: 2025-01-01
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - 'eximious-magazine'
            - '../'
            - '%2e%2e%2f'
            - 'file='
            - 'template='
            - 'include='
    condition: selection
falsepositives:
    - Legitimate use of relative paths in admin area (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-53248 - WordPress eximious-magazine Theme LFI Attempt";
    flow:to_server,established;
    content:"eximious-magazine"; http_uri;
    content:"../"; http_uri; distance:0;
    content:"file="; http_uri; distance:0;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable or replace the theme – Switch to a different, actively maintained WordPress theme.
2. Apply virtual patching – Use a WAF to block path traversal patterns (e.g., ../, %2e%2e%2f).
3. Restrict file permissions – Ensure sensitive files (e.g., wp-config.php) are not readable by the web server user.

Long-Term Fix:

• The vendor (Unfoldwp) must release a patched version that implements input validation and whitelisting.
• Until then, users should manually patch the theme by adding a whitelist check in the vulnerable file.

Workaround Code (Add to theme's functions.php):

add_action('init', function() {
    if (isset($_GET['file']) || isset($_GET['template']) || isset($_GET['include'])) {
        wp_die('Direct file inclusion is disabled.');
    }
});

Monitoring:

• Continuously monitor for exploitation attempts using the provided detection rules.
• Review server logs for any successful LFI attempts.

Valters IT – Securing digital frontiers, one CVE at a time.