FileUpload Command Injection in Unraid Web Server

Executive Summary

This vulnerability exists in the Unraid Web Server specifically in the FileUpload.php file. It is a command injection flaw that allows remote attackers, who have authentication, to execute arbitrary code on the affected system. The root cause is the lack of proper validation of a user-supplied string before it is used in a system call, enabling attackers to run commands with the privileges of the www-data user.

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Impact Analysis

This vulnerability can have a severe impact as it allows an authenticated remote attacker to execute arbitrary code on the affected Unraid server. This could lead to full compromise of the system, including unauthorized access, data theft, data modification, or disruption of services. The attacker gains the ability to run commands with the privileges of the web server user, which can be leveraged to escalate privileges or move laterally within a network.

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Mitigation Strategies

The immediate mitigation step is to upgrade Unraid to version 7.3.0 stable or later, where this vulnerability has been fixed.

Additionally, restrict access to the Unraid web server to trusted users only, since authentication is required to exploit this vulnerability.

Monitoring and limiting user input to the FileUpload.php component may also help reduce risk until the patch is applied.

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Detection Guidance

Detection of this vulnerability involves identifying if the system is running a vulnerable version of Unraid prior to 7.3.0 stable, as the vulnerability exists in the FileUpload.php component.

Since exploitation requires authentication and involves improper validation of user input in FileUpload.php, monitoring web server logs for suspicious POST requests to FileUpload.php with unusual or command-like input may help detect attempts.

No specific detection commands are provided in the available resources.

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