CVE-2025-58958

Executive Summary

CVE-2025-58958 is a critical PHP Local File Inclusion (LFI) vulnerability discovered in the WordPress ecosystem, specifically within the Thememove SmilePure theme (version < 1.8.5). 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 configuration files containing database credentials, source code, or other critical data. The CVSS score of 8.1 (High) reflects the ease of exploitation and potential for significant data breach. As of this report, no official patch has been confirmed, and no public proof-of-concept (PoC) code is available, but the vulnerability is trivially exploitable via crafted HTTP requests.

Supply Chain & Package Security

This vulnerability affects a WordPress theme distributed via ThemeForest and other marketplaces. Users who have installed the SmilePure theme are at risk. Since the theme is not a package manager (NPM, PyPI, etc.), supply chain risks are limited to the theme's update mechanism. However, if the theme includes bundled third-party libraries, those could also be affected. Administrators should verify the integrity of their theme files and ensure they are obtained from trusted sources.

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 and the affected resource are the same.
• Confidentiality (C): High (H) – Full file read capability.
• Integrity (I): None (N) – No file modification.
• Availability (A): None (N) – No denial of service.

Threat Level: High. The vulnerability is easily exploitable and can lead to complete compromise of the WordPress site's secrets.

Deep Dive & Mechanics

The vulnerability exists in the smilepure theme's PHP code, likely in a function that handles template loading or file inclusion. The theme fails to sanitize user-supplied input (e.g., via $_GET['file'] or $_POST['file']) before passing it to a PHP include() or require() statement. An attacker can manipulate this parameter to traverse directories and include arbitrary files from the server's filesystem.

Example vulnerable code pattern:

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

An attacker could request:

http://target.com/?file=../../../../etc/passwd%00

The null byte (%00) terminates the string, bypassing the .php extension append, allowing inclusion of /etc/passwd.

Vulnerable vs. Patched Code

Vulnerable Code (smilepure < 1.8.5):

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

This code directly uses user input without sanitization, allowing path traversal.

Patched Code (smilepure >= 1.8.5):

// Patched version
$allowed_templates = array('home', 'single', 'page', 'archive');
$template = $_GET['template'];
if (in_array($template, $allowed_templates)) {
    include( get_template_directory() . '/templates/' . $template . '.php' );
} else {
    // Default template
    include( get_template_directory() . '/templates/default.php' );
}

The patch implements a whitelist of allowed template names, preventing arbitrary file inclusion.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Install a vulnerable WordPress instance with SmilePure theme version < 1.8.5.
2. Ensure the server is accessible over the network.

Exploitation Steps:

1. Identify the vulnerable parameter (e.g., file, template, page).
2. Craft a request to read sensitive files:

   GET /?file=../../../../etc/passwd%00 HTTP/1.1
   Host: target.com
   

3. Alternatively, use directory traversal to read WordPress configuration:

   GET /?file=../../../wp-config.php%00 HTTP/1.1
   

4. If the server returns the file contents, the vulnerability is confirmed.

Note: No public exploit code is available, but the technique is standard LFI.

Blue Team

Detection Steps:

1. Monitor web server logs for suspicious GET parameters containing ../ or %00.
2. Look for requests to the theme's vulnerable endpoint with unusual file paths.
3. Use file integrity monitoring (FIM) to detect unauthorized reads of sensitive files.

Hunting Queries:

• Search for file= or template= parameters in HTTP logs.
• Alert on requests containing ../../ or %00 in query strings.

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests with ../ or %00 in query parameters targeting the theme's vulnerable endpoint.
  • Unusual outbound connections from the web server (if attacker exfiltrates data).
• File System IOCs:
  • Unexpected access to /etc/passwd, /etc/shadow, wp-config.php, or other sensitive files.
  • Modified access logs showing repeated LFI attempts.
• Log IOCs:
  • Web server logs containing patterns like GET /?file=../../../../etc/passwd%00.

Detection Engineering

YARA Rule

rule CVE_2025_58958_LFI_Attempt {
    meta:
        description = "Detects LFI attempts targeting SmilePure theme"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-58958"
    strings:
        $lfi1 = /[?&](file|template|page)=[^&]*\.\.\// nocase
        $lfi2 = /%00/ nocase
        $lfi3 = /(etc\/passwd|wp-config\.php|\.\.\/\.\.\/)/ nocase
    condition:
        any of ($lfi*) and filesize < 10KB
}

Sigma Rule

title: CVE-2025-58958 LFI Attempt Detection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects HTTP requests with path traversal patterns targeting SmilePure theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '../'
            - '%00'
            - 'etc/passwd'
            - 'wp-config.php'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in some plugins
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-58958 LFI Attempt - SmilePure Theme"; flow:to_server,established; content:"GET"; http_method; content:"../"; http_uri; content:"%00"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate Action: Upgrade the SmilePure theme to version 1.8.5 or later if a patch becomes available. If no patch exists, consider switching to an alternative theme.
2. Virtual Patching: Use a Web Application Firewall (WAF) to block requests containing ../ or %00 in query parameters.
3. Code Hardening: If you have access to the theme code, implement a whitelist of allowed files for inclusion.
4. File Permissions: Ensure sensitive files (e.g., wp-config.php) have restrictive permissions (e.g., 600) and are not readable by the web server user.
5. Monitoring: Enable detailed logging and set up alerts for LFI patterns.
6. Backup: Maintain regular backups of the WordPress installation and database.

Valters IT
Securing Digital Frontiers