CVE-2025-49279

Executive Summary

CVE-2025-49279 is a critical PHP Local File Inclusion (LFI) vulnerability discovered in the Blogvy WordPress theme, developed by Unfoldwp. 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, remote code execution (if combined with file upload), and full server compromise. The vulnerability affects all versions of Blogvy up to and including 1.0.7. As of this report, no official patch has been released, and no public proof-of-concept (PoC) code is available.

Supply Chain & Package Security

This vulnerability resides in a WordPress theme, which is part of the broader WordPress ecosystem. Users who have installed the Blogvy theme from the official WordPress repository or third-party marketplaces are at risk. The theme is distributed as a standard WordPress package, and the vulnerability is introduced through the theme's PHP code. There is no known compromise of the theme's distribution channel; the flaw is inherent in the codebase.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely.
• Attack Complexity (AC): Low (L) - No special conditions are required for exploitation.
• Privileges Required (PR): None (N) - No authentication is needed.
• User Interaction (UI): None (N) - No user action is required.
• Scope (S): Unchanged (U) - The vulnerable component and the impacted component are the same.
• Confidentiality (C): High (H) - Sensitive files (e.g., wp-config.php, /etc/passwd) can be read.
• Integrity (I): High (H) - If combined with file upload, arbitrary code execution is possible.
• Availability (A): High (H) - An attacker could potentially cause a denial of service by including a large or infinite file.

CVSS Score: 8.1 (High)

Deep Dive & Mechanics

The vulnerability is a classic PHP Local File Inclusion (LFI) issue. The Blogvy theme likely uses a dynamic include statement (e.g., include($_GET['page']);) without proper sanitization or validation of the user-supplied input. An attacker can manipulate the page parameter (or similar) to traverse directories and include arbitrary files from the server.

Example vulnerable code pattern:

<?php
$page = $_GET['page'];
include($page . '.php');
?>

By providing a path like ../../../../etc/passwd%00, the attacker can null-terminate the string and include /etc/passwd. Alternatively, using path traversal without null byte (if PHP version < 5.3.4) or with wrapper protocols like php://filter can also be used.

Attack flow:

1. Attacker identifies a parameter in the Blogvy theme that is passed to an include/require statement.
2. Attacker crafts a malicious URL: http://target.com/wp-content/themes/blogvy/somepage.php?page=../../../../etc/passwd
3. The server includes the specified file, outputting its contents to the attacker.

Vulnerable vs. Patched Code

Since no patch is available, we can only hypothesize the vulnerable code and the required fix.

Vulnerable Code (hypothetical):

<?php
// In a theme file like template-loader.php
$template = $_GET['template'];
include( get_template_directory() . '/' . $template . '.php' );
?>

Patched Code (recommended):

<?php
$allowed_templates = array('home', 'single', 'page', 'archive');
$template = $_GET['template'];
if ( in_array( $template, $allowed_templates ) ) {
    include( get_template_directory() . '/' . $template . '.php' );
} else {
    // Handle error or load default
    include( get_template_directory() . '/index.php' );
}
?>

The fix involves whitelisting allowed template names and rejecting any input that does not match.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

• Install WordPress with Blogvy theme version 1.0.7 on a local server (e.g., XAMPP, Docker).
• Ensure the server is accessible from the attacker machine.

Exploitation Steps:

1. Identify the vulnerable parameter. Common parameters in WordPress themes include page, template, include, file.
2. Test for LFI using path traversal:

   http://target.com/wp-content/themes/blogvy/index.php?page=../../../../etc/passwd
   

3. If successful, read sensitive files:

   http://target.com/wp-content/themes/blogvy/index.php?page=../../../../wp-config.php
   

4. Attempt to achieve RCE by including a log file (e.g., Apache access log) with injected PHP code, or by using the php://filter wrapper to decode base64-encoded payloads.

Note: No public exploit code is available, so manual testing is required.

Blue Team (Defensive)

Detection Steps:

• Monitor web server logs for suspicious patterns like ../, %00, php://, file://.
• Look for requests to theme files with unexpected parameters.
• Use WAF rules to block path traversal attempts.

Hunting Queries:

• Search for GET requests containing page= or template= with directory traversal sequences.
• Alert on any request that includes wp-config.php or /etc/passwd in the query string.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests containing ../ or %00 in parameters like page, template, file.
  • Requests to wp-content/themes/blogvy/ with unusual query strings.
  • Outbound connections from the web server to unknown IPs (if RCE achieved).

• File System IOCs:

  • Unexpected files in the web root (e.g., shell.php).
  • Modified .htaccess files.
  • Presence of base64-encoded strings in log files.

• Log IOCs:

  • Apache/Nginx access logs showing 200 OK responses for /etc/passwd or wp-config.php.
  • Error logs with PHP Warning: include() messages for non-existent files.

Detection Engineering

YARA Rule

rule CVE_2025_49279_LFI_Detection {
    meta:
        description = "Detects attempts to exploit CVE-2025-49279 LFI in Blogvy theme"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-49279"
    strings:
        $lfi1 = /page=\.\.\/|template=\.\.\/|file=\.\.\//
        $lfi2 = /page=php:\/\/|template=php:\/\/|file=php:\/\//
        $lfi3 = /page=\/etc\/|template=\/etc\/|file=\/etc\//
        $lfi4 = /page=wp-config|template=wp-config|file=wp-config/
    condition:
        any of them
}

Sigma Rule

title: CVE-2025-49279 Blogvy Theme LFI Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects HTTP requests attempting to exploit LFI in Blogvy WordPress theme
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '../'
            - 'php://'
            - 'file://'
            - '/etc/passwd'
            - 'wp-config.php'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in some plugins
level: high

Suricata Rule

alert http any any -> $HOME_NET any (msg:"CVE-2025-49279 Blogvy LFI Attempt"; flow:to_server,established; content:"GET"; http_method; content:"/wp-content/themes/blogvy/"; http_uri; pcre:"/(page|template|file)=.*\.\.\//i"; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the Blogvy theme and switch to a default WordPress theme (e.g., Twenty Twenty-Four) until a patch is available.
2. Implement a Web Application Firewall (WAF) with rules to block path traversal and file inclusion attempts.
3. Restrict file permissions on sensitive files (e.g., wp-config.php should be readable only by the web server user).

Long-term Fix:

• The vendor (Unfoldwp) must release a patched version that properly sanitizes user input and uses a whitelist approach for included files.
• Users should monitor the WordPress plugin/theme repository for updates.

Workaround:

• Add the following to .htaccess to block common LFI patterns:

  RewriteEngine On
  RewriteCond %{QUERY_STRING} (\.\./|php://|file://) [NC]
  RewriteRule .* - [F,L]
  

Valters IT
Securing Digital Frontiers