Executive Summary

CVE-2020-36921 is an information disclosure vulnerability in the RED-V Super Digital Signage System version 5.1.1, specifically affecting the RXV-A740R model. It allows unauthenticated attackers to access sensitive webserver log files by visiting multiple endpoints without needing to authenticate. These log files contain system resources and debug information, exposing critical internal details about the device's operation. [2, 3, 4]

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Impact Analysis

This vulnerability can impact you by exposing sensitive system resources and debug information to unauthenticated attackers. The exposed log files may reveal critical internal details about the device's operation, which could be used to facilitate further attacks or compromise the system's security and integrity. [2, 3, 4]

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Detection Guidance

This vulnerability can be detected by attempting to access the exposed log file endpoints on the RED-V Super Digital Signage System webserver without authentication. Specifically, you can try to retrieve log files such as /downloader.log, /launcher.log, /player.log, and their date-stamped variants by sending HTTP requests to the device's webserver, typically accessible on port 8080. For example, you can use curl commands like: curl http://<device-ip>:8080/downloader.log curl http://<device-ip>:8080/launcher.log curl http://<device-ip>:8080/player.log If these requests return log file contents without requiring authentication, the system is vulnerable. [3]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the exposed log file endpoints by implementing authentication controls on the webserver to prevent unauthenticated access. Additionally, updating the RED-V Super Digital Signage System to a patched version released by the vendor that addresses this vulnerability is recommended. Until a patch is applied, network-level controls such as firewall rules to block external access to the device's webserver port (e.g., port 8080) can reduce exposure. [2, 4]

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