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CVE-2020-5724 is a critical SQL injection vulnerability in Grandstream UCM6200 series devices (firmware versions before 1.0.20.22). The flaw exists in the HTTP server's websockify endpoint, specifically in the WebSocket-based challenge generation during the login process. A remote, unauthenticated attacker can exploit this by sending crafted WebSocket requests with maliciously constructed usernames, enabling SQL injection. This allows enumeration of user IDs and extraction of all usernames and passwords from the device database, including the admin account.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit auxiliary module targeting Grandstream UCM62xx IP PBX devices vulnerable to a blind SQL injection (CVE-2020-5724) and cleartext password storage (CVE-2020-5723). The exploit operates by sending crafted WebSocket requests to the '/websockify' endpoint, leveraging a blind SQL injection vulnerability in the authentication challenge mechanism. It uses the server's response status to infer database contents and extracts usernames and cleartext passwords from the 'users' table. The module also checks the device's firmware version via the '/cgi' endpoint to determine if it is vulnerable (versions below 1.0.20.22). The exploit is operational, providing credential extraction capabilities, and is implemented in Ruby as part of the Metasploit framework.
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