Synway SMG Gateway Arbitrary File Read Scanner

Synway SMG Gateway is utilized predominantly by telecommunications companies for managing voice and data transmission over IP networks. It's a comprehensive gateway management software designed to optimize and streamline communication processes by offering integrated voice and signaling interfaces. Widely adopted in various industries, this software supports seamless connections between telecommunication networks and enterprise communication systems. The product is known for its high reliability, flexibility, and scalability, catering to both small and large scale operations. Companies use Synway SMG Gateway to enhance network efficiency, reduce operational costs, and ensure secure voice communication. Integrating with different network architectures, it is essential in maintaining robust telecommunications infrastructures worldwide.

The vulnerability enables arbitrary file reading through a specific file in the Synway SMG Gateway management software. It exposes the application to attackers who can exploit this flaw to retrieve sensitive files from the server. The unchecked access facilitates the download of any file by manipulating the "down.php" file on the server. Exploiting this vulnerability, attackers can breach confidential configurations, secrets, and user data stored on the server. Once compromised, it undermines the security of the network, leading to potential data leaks. Ensuring such vulnerabilities are patched is crucial to maintaining the confidentiality and integrity of the network-associated data.

The vulnerability resides in the handling of the "down.php" file within the Synway SMG Gateway software, where inadequate validation allows for arbitrary file reading. Attackers craft a specifically structured HTTP POST request targeting this file to exploit this vulnerability. The request typically includes multipart form-data where the parameter "downfile" is manipulated to point towards critical files like "/etc/passwd". Successful exploitation results in the server responding with the contents of specified files, confirming unauthorized access. Furthermore, this vulnerability can be executed without any prior authentication, increasing its severity. The resulting security breach can be confirmed by examining the response, which includes key file content and specific HTTP headers.

When exploited, this vulnerability can have severe consequences, including unauthorized access to sensitive files, which contain vital information about the server and user accounts. Attackers could leverage this information to conduct more profound compromise actions, like privilege escalation or injecting malware. The exposure of system configuration files can lead to a full system compromise. Additionally, it can result in service disruption or complete denial of service if exploited to read or manipulate essential system files. The leak of sensitive data can damage an organization's reputation, lead to legal ramifications, and incur substantial financial losses.

REFERENCES

• https://github.com/Threekiii/Awesome-POC/blob/master/Web%E5%BA%94%E7%94%A8%E6%BC%8F%E6%B4%9E/%E4%B8%89%E6%B1%87SMG%20%E7%BD%91%E5%85%B3%E7%AE%A1%E7%90%86%E8%BD%AF%E4%BB%B6%20down.php%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E.md