Executive Summary

CVE-2019-25577 is a Local File Inclusion (LFI) vulnerability in SeoToaster Ecommerce version 3.0.0. It allows authenticated attackers to read arbitrary files on the server by exploiting insufficient validation of path parameters in backend theme endpoints. Attackers can send specially crafted POST requests to the endpoints /backend/backend_theme/editcss/ or /backend/backend_theme/editjs/ with directory traversal sequences in the getcss or getjs parameters, which causes the application to include and disclose the contents of local files.

This vulnerability arises because the backend theme editing functionality does not properly sanitize input, allowing directory traversal (e.g., ../) to access files outside the intended directories.

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive files on the server, such as configuration files, source code, or other data that should not be accessible. Attackers with authenticated access can exploit this flaw to read arbitrary files, potentially gaining information that could be used for further attacks or to compromise the system.

Since the vulnerability requires low privileges and no user interaction, it increases the risk of information leakage within the system.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability can be detected by sending crafted POST requests to the SeoToaster Ecommerce backend theme endpoints and observing if arbitrary local files can be retrieved.

Specifically, you can test the endpoints `/backend/backend_theme/editcss/` and `/backend/backend_theme/editjs/` by sending POST requests with directory traversal sequences in the parameters `getcss` or `getjs`.

• Send a POST request to `/backend/backend_theme/editcss/` with the body `getcss=../index.php`.
• Send a POST request to `/backend/backend_theme/editjs/` with the body `getjs=../index.php`.

If the server responds with HTTP 200 OK and returns the contents of the requested file (e.g., index.php) in the response, the vulnerability is present.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable backend endpoints to trusted users only, as the vulnerability requires authenticated access.

Additionally, ensure proper input validation and sanitization on the parameters `getcss` and `getjs` to prevent directory traversal sequences.

If possible, update SeoToaster Ecommerce to a version where this vulnerability is fixed or apply patches provided by the vendor.

As a temporary measure, monitor and block suspicious POST requests targeting `/backend/backend_theme/editcss/` and `/backend/backend_theme/editjs/` endpoints that contain directory traversal patterns.

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