Unauthenticated File Upload in Filament Laravel Components

Executive Summary

This vulnerability exists in Filament, a set of components for Laravel development, where certain schema components unintentionally allow unauthenticated users to upload files to the application's temporary storage.

Specifically, from versions 3.0.0 until 3.3.52, 4.11.5, and 5.6.5, any schema can include a file upload form field because Filament applies Livewire's WithFileUploads trait to the Livewire component containing the schema.

However, some schemas like the panel login form do not require file uploads, and exposing unauthenticated temporary file uploads on these components is a security risk.

An unauthenticated attacker could exploit this to upload arbitrary files to temporary storage.

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Impact Analysis

The vulnerability allows unauthenticated attackers to upload arbitrary files to the application's temporary storage.

This can be abused to exhaust disk space, potentially causing denial of service or degraded application performance.

Additionally, it can inflate storage costs due to the accumulation of unwanted files.

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade Filament to one of the fixed versions: 3.3.52, 4.11.5, or 5.6.5.

This will prevent unauthenticated attackers from uploading arbitrary files to the application's temporary storage, thereby avoiding risks such as disk space exhaustion or inflated storage costs.

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Compliance Impact

The vulnerability allows unauthenticated attackers to upload arbitrary files to the application's temporary storage, which could lead to exhaustion of disk space or increased storage costs.

However, there is no specific information provided about how this vulnerability impacts compliance with common standards and regulations such as GDPR or HIPAA.

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Detection Guidance

To detect this vulnerability on your system, you can check if your Filament PHP framework version is within the affected ranges: 3.0.0 to 3.3.50, 4.0.0 to 4.11.3, or 5.0.0 to 5.6.3. Additionally, monitoring for unauthorized file uploads to temporary storage on authentication pages such as the login form can help identify exploitation attempts.

You can use commands to inspect the application version and look for suspicious files in temporary storage directories. For example, to check the Filament version, you might run:

• grep filament composer.lock

To detect unexpected files uploaded to temporary storage, you can list files in the temporary upload directory used by the application, for example:

• ls -l /path/to/filament/storage/framework/livewire-tmp

Monitoring web server logs for POST requests to authentication pages that include file upload data may also help detect exploitation attempts.

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