CVE-2025-69066

Executive Summary

CVE-2025-69066 is a critical security vulnerability affecting the Indoor Plants WordPress theme developed by AncoraThemes, up to and including version 1.2.7. The vulnerability is a PHP Local File Inclusion (LFI) flaw, stemming from improper control of filenames used in include/require statements. This allows an unauthenticated attacker to include arbitrary local files from the server, potentially leading to sensitive information disclosure (e.g., /etc/passwd, database credentials, or source code). The CVSS score of 8.1 reflects the high impact on confidentiality with low attack complexity and no required privileges. As this is a WordPress theme vulnerability, it falls squarely within the WordPress ecosystem and must be addressed by updating the theme or applying a virtual patch.

Supply Chain & Package Security

This vulnerability is specific to the Indoor Plants WordPress theme, which is distributed via the WordPress theme repository and third-party marketplaces. Users who obtained the theme from unofficial sources may be at higher risk if they cannot receive updates. The lack of a patch from the vendor (AncoraThemes) means that all installations of version 1.2.7 and below are currently exposed. Organizations should treat this as a supply chain risk and consider replacing the theme if no patch is forthcoming.

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

Threat Level: High. The vulnerability is trivial to exploit and can lead to the exposure of sensitive server-side files, including WordPress configuration files (wp-config.php) containing database credentials.

Deep Dive & Mechanics

The vulnerability exists in the indoor-plants theme's PHP code, where user-supplied input is used to construct a file path for an include() or require() statement without proper sanitization. Specifically, the theme likely uses a parameter (e.g., page, template, or file) to load template files dynamically. An attacker can manipulate this parameter to traverse directories and include arbitrary files from the server.

Example vulnerable code pattern:

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

By supplying a path like ../../../../etc/passwd%00, the attacker can break out of the intended directory and include sensitive files. The null byte (%00) may be used to truncate the .php extension in older PHP versions, though modern PHP versions may require alternative techniques (e.g., path traversal with double encoding or using php://filter for LFI-to-RFI conversion).

Attack flow:

1. Attacker identifies a parameter in the theme that is passed to an include/require function.
2. Attacker crafts a request with a path traversal payload, e.g., ?template=../../../etc/passwd.
3. The server includes the specified file, outputting its contents in the HTTP response.
4. Attacker reads sensitive data.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common remediation patterns.

Vulnerable Code (indoor-plants theme, version <= 1.2.7):

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

Patched Code (hypothetical):

// Whitelist allowed templates
$allowed_templates = array('default', 'full-width', 'sidebar');
$template = $_GET['template'];
if ( in_array( $template, $allowed_templates ) ) {
    include( get_template_directory() . '/templates/' . $template . '.php' );
} else {
    // Fallback to default
    include( get_template_directory() . '/templates/default.php' );
}

The patched version uses a whitelist approach, ensuring only predefined template names can be included. Alternatively, realpath() and basename() functions can be used to sanitize the path.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• A WordPress site running Indoor Plants theme version <= 1.2.7.
• Knowledge of the vulnerable parameter (e.g., template, page, file).

Exploitation Steps:

1. Identify the vulnerable parameter by fuzzing the theme's URL patterns (e.g., /?template=test).
2. Confirm LFI by attempting to include /etc/passwd:

   GET /?template=../../../etc/passwd HTTP/1.1
   Host: target.com
   

3. If the response contains the contents of /etc/passwd, the vulnerability is confirmed.
4. For more advanced exploitation, use php://filter to read PHP source code:

   GET /?template=php://filter/convert.base64-encode/resource=../../../wp-config.php HTTP/1.1
   

5. Decode the base64 output to retrieve database credentials.

Example curl command:

curl -v "http://target.com/?template=../../../etc/passwd"

Blue Team (Detection & Hardening)

Detection:

• Monitor web server logs for suspicious template or file parameters containing ../ or php://.
• Look for requests with multiple directory traversals (e.g., ../../../../).
• Alert on attempts to include sensitive files like /etc/passwd, wp-config.php, or .env.

Hardening:

• Disable PHP allow_url_include and allow_url_fopen if not needed.
• Apply a Web Application Firewall (WAF) rule to block path traversal patterns.
• If possible, replace the theme with a patched alternative or manually apply the whitelist fix.

Indicators of Compromise (IOCs)

File Paths:

• /etc/passwd
• /etc/shadow
• /wp-config.php
• /.env
• /proc/self/environ

URL Patterns:

• ?template=../../../etc/passwd
• ?file=php://filter/convert.base64-encode/resource=...
• ?page=....//....//....//etc/passwd

Log Entries:

• HTTP GET requests with ../ in query parameters.
• 200 OK responses for requests targeting /etc/passwd.
• Base64-encoded strings in response bodies.

Detection Engineering

YARA Rule

rule CVE_2025_69066_LFI_Detection {
    meta:
        description = "Detects LFI attempts targeting CVE-2025-69066 in Indoor Plants theme"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-69066"
    strings:
        $path_traversal = /(\.\.\/){2,}(etc\/passwd|wp-config\.php|proc\/self\/environ)/
        $php_filter = /php:\/\/filter/
        $null_byte = /%00/
    condition:
        any of them
}

Sigma Rule

title: CVE-2025-69066 LFI Attempt
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects path traversal attempts in Indoor Plants theme
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains:
            - '../'
            - '..%2f'
            - 'php://filter'
            - '/etc/passwd'
            - 'wp-config.php'
    condition: selection
falsepositives:
    - Legitimate use of relative paths in other themes
level: high

Suricata Rule

alert http any any -> any any (
    msg:"CVE-2025-69066 LFI Attempt - Indoor Plants Theme";
    flow:to_server,established;
    content:"GET";
    http_method;
    content:"../";
    http_uri;
    pcre:"/(\.\.\/){2,}(etc\/passwd|wp-config\.php|proc\/self\/environ)/Ui";
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Update the theme: If a patched version becomes available, update immediately. Currently, no patch exists.
2. Disable the theme: Temporarily switch to a different, secure WordPress theme.
3. Apply a virtual patch: Use a WAF to block requests containing ../, php://, or attempts to access sensitive files.

Long-term Fix:

• The vendor (AncoraThemes) must release a patched version that implements input validation and whitelisting for file includes.
• Users should monitor the WordPress theme repository for updates.

Workaround:

• Manually edit the theme's PHP files to add a whitelist of allowed templates (as shown in the patched code example). This requires custom development and testing.

Valters IT Signature This report was generated by Valters IT Cyber Threat Intelligence Division. For questions, contact threatintel@valtersit.com.