NativeChurch WordPress Theme Path Traversal Allows Arbitrary File Download

The NativeChurch theme for WordPress contains a path traversal vulnerability that allows unauthenticated access to arbitrary files. This flaw exists in the theme's download functionality, specifically within the download.php script. Attackers can manipulate the file parameter to read sensitive information from the server. The vulnerability is classified as high severity with a CVSS score of 8.7.

Root cause

The underlying issue stems from improper validation of user-supplied input in the file parameter. The application fails to sanitize directory traversal sequences before processing the request. This weakness is categorized under CWE-22, which relates to path traversal flaws. Consequently, the server interprets malicious input as a valid file path, exposing internal directories to external actors.

Attack path

An attacker sends a GET request to the vulnerable download.php file. The request includes directory traversal sequences in the file parameter. These sequences allow the attacker to move up the directory tree from the expected location. Successful exploitation results in the retrieval of sensitive files, such as wp-config.php, which often contains database credentials and other critical configuration details.

Affected versions

The vulnerability impacts the NativeChurch theme developed by imithemes. Only installations running versions prior to 1.6.2 are affected. Users must ensure their theme version is checked against this threshold. Any version number lower than 1.6.2 is considered vulnerable and requires attention.

Mitigation

• Update the NativeChurch theme to version 1.6.2 or later immediately.
• Remove the theme if it is no longer in use on the site.
• Implement web application firewall rules to block directory traversal attempts.
• Restrict access to download.php if the functionality is not required.

Signals worth monitoring

Security operations teams should monitor web server access logs for GET requests targeting download.php with unusual parameters. Look for sequences containing double dots and slashes that indicate directory traversal attempts. Alert on responses that return sensitive configuration files or source code. Verify that file downloads match expected user behavior and content types. Check for unauthorized access to wp-config.php or similar critical files. Investigate any successful retrieval of files outside the intended web root directory.

What to do and how to stay safe: NativeChurch

• Inventory all WordPress installations to identify those using the NativeChurch theme.
• Check the current version of the theme against the vulnerable range.
• Update the theme to the patched version once the vendor provides an update.
• Monitor server logs for signs of exploitation attempts during the transition period.

Step-by-step guide: Attack Surface Management: 6 Common Misreadings and Correct Views

General security guidance from the NetSec Observer newsroom. It is not confirmed advice from the organisations named in this story.

Frequently asked questions

What is the severity of CVE-2014-125133?

The vulnerability is rated as high severity with a CVSS score of 8.7.

Which versions of the NativeChurch theme are affected?

All versions before 1.6.2 are affected by this path traversal vulnerability.

What evidence of exploitation has been observed?

The Shadowserver Foundation observed exploitation evidence starting on 2023-10-19.