External risk intelligence

FileThingie Arbitrary File Upload Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.3)

CVE-2019-25471

FileThingie is a web-based file management application. By design, such applications are typically deployed as web interfaces to provide remote or network-based access to file systems, making the web endpoint (ft2.php) a commonly exposed service for users or administrators.

Path Traversal

Leefish File Thingie

2.5.7 and earlier

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in FileThingie, a file management tool, that could allow unauthorized access and command execution on affected systems. The vulnerability involves an arbitrary file upload flaw through the `ft2.php` endpoint, enabling attackers to upload and execute malicious files. The primary concern is to confirm if this technology is in use and assess any potential exposure.

  • File upload flaw allows remote command execution.
  • Critical vulnerability impacts FileThingie file management.
  • Confirm relevance and assess potential exposure.

Attack Path

How an attacker could exploit the issue

An attacker can upload malicious ZIP files containing executable code to the target system by sending them to the `ft2.php` endpoint. The application's built-in unzip functionality then extracts these files into an accessible location, allowing the attacker to trigger the uploaded code and execute arbitrary commands.

  • Unauthenticated access to `ft2.php` endpoint.
  • Uploading a ZIP archive with malicious content.
  • Arbitrary command execution.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, this vulnerability could allow an unauthenticated attacker to upload and execute arbitrary code through a ZIP archive upload to the `ft2.php` endpoint. This could compromise the integrity and availability of the server hosting the application.

  • Server-side code execution.
  • Malicious ZIP upload via `ft2.php`.
  • Server compromise and data integrity loss.

Operational Fix

Recommended remediation, mitigation, and detection steps

This vulnerability in FileThingie likely falls under the responsibility of the application owner or platform team, as it involves a web application's functionality. The immediate first step should be to identify all instances of FileThingie within the environment, confirm their exposure and business criticality, and then determine the appropriate remediation or mitigation strategy in coordination with the accountable owner.

  • Application and platform teams own remediation.
  • Verify FileThingie instance exposure.
  • Plan vendor coordination for updates.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is FileThingie and how is it used?

FileThingie is a web-based file management application developed by leefish. Users typically deploy it to provide a remote or network-accessible interface for managing files directly on a server's file system, essentially serving as a browser-based dashboard for directory and file operations.

What does arbitrary file upload mean for CVE-2019-25471?

This vulnerability, classified as CWE-22, means the application lacks sufficient checks on files sent to it. Specifically, CVE-2019-25471 allows an attacker to bypass intended file restrictions, upload a ZIP archive containing malicious scripts, and use the software's own features to extract them into a location where they can be executed by the server.

How does an attacker trigger this vulnerability?

An attacker targets the ft2.php endpoint by sending a specifically crafted ZIP archive. The vulnerability is triggered when the application processes this archive using its built-in unzip function. Simply sending files that do not leverage this specific extraction process or targeting other endpoints will not trigger this command execution flaw.

Is my FileThingie instance at risk?

According to Halo Surface Signal, FileThingie is designed as a web interface for remote file management, which often places the ft2.php endpoint in a position where it is accessible over a network. If your installation is internet-facing or reachable by unauthorized parties, it faces a higher level of risk compared to instances restricted to internal, private networks.

What should I do if I run FileThingie?

The immediate priority is to locate all instances of the software within your environment to understand your footprint. Once identified, evaluate whether these instances are exposed to untrusted networks, and work with your platform team to coordinate necessary updates or restrict access to the application endpoints until a formal remediation is applied.

References