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CVE-2021-36393 is an SQL injection vulnerability in Moodle. According to the provided content, the flaw exists in the library responsible for fetching a user's recent courses. Insufficient neutralization of attacker-controlled input in SQL query construction could allow crafted input to alter backend database queries executed by the application.
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This repository provides a proof-of-concept (PoC) exploit for CVE-2021-36393, an error-based blind SQL injection vulnerability in Moodle (versions 3.10.4, 3.11, 3.10 to 3.10.4, 3.9 to 3.9.7, and earlier unsupported versions). The exploit is implemented in JavaScript and is intended to be run in the browser console by an authenticated user on a vulnerable Moodle instance. The main file, script.js, contains functions to perform binary search and bit-shifting techniques to extract arbitrary data from the database via crafted AJAX POST requests to /lib/ajax/service.php. It can be used to steal quiz answers, user password hashes, and session IDs. The keep_session.js script is a helper to maintain the validity of a stolen session by periodically touching the session endpoint. The README.md provides usage instructions, example queries, and context about the vulnerability. No external network endpoints or IP addresses are hardcoded; all endpoints are relative to the Moodle instance being targeted. The exploit is a PoC and requires manual interaction, but demonstrates a powerful attack vector against affected Moodle installations.
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