rConfig Arbitrary File Upload Scanner

rConfig is a popular open-source configuration management tool used by network administrators and IT professionals around the world. It allows users to automate device configuration tasks, monitor network changes, and maintain consistent network configuration settings. Designed primarily for network devices, rConfig provides a centralized platform for managing various network configurations efficiently. It is utilized in various sectors, including corporate IT environments, telecommunications, and data centers, to streamline network management processes. Network engineers frequently rely on rConfig for its robust features that enable quick responses to configuration changes and troubleshooting needs.

The arbitrary file upload vulnerability in rConfig 3.9.5 poses a significant security threat as it allows unauthorized users to upload malicious files to the server. This type of vulnerability can enable attackers to execute arbitrary code, leading to a compromise of the entire system. File upload vulnerabilities are particularly dangerous as they can bypass authentication mechanisms, giving attackers the ability to execute remote commands or scripts. In secure environments, such vulnerabilities might lead to unauthorized access to sensitive data. Identifying and patching this vulnerability is crucial in preventing potential exploitation of the system.

The technical details of the vulnerability include an insecure upload endpoint 'userprocess.php' which does not properly verify or sanitize user input. This endpoint allows unauthorized files to be uploaded without validating the file type or content, thus exposing the application to various types of attacks. The attacker can craft a special HTTP POST request and include executable scripts as file uploads. By exploiting this insecure file handling, attackers can achieve remote code execution on the affected rConfig instance. Such unauthorized file operations stem from deep flaws within the software's handling of HTTP requests, particularly within the route handling file uploads.

When exploited, this vulnerability can lead to severe consequences including data disclosure, manipulation, and a full system takeover. Unauthorized code execution can result in altered configurations or network disruptions. Attackers could install backdoors or other types of malware, compromising the system’s confidentiality, integrity, and availability. Sensitive information stored on the server or accessible through it might be exposed, leading to further breaches and potential network-wide impacts. The exploitation of this vulnerability could also be leveraged for lateral movement within the network, making other systems susceptible to attacks.

REFERENCES

• https://www.rconfig.com/downloads/rconfig-3.9.5.zip
• https://www.exploit-db.com/exploits/48878