Sample Report— This is a fictitious plugin created to demonstrate the format and detail of an MDL Shield security review. The plugin, findings, and code samples shown here are entirely fabricated for illustrative purposes.

Quiz Analytics Dashboard (Fictitious)

local_fakequizanalytics

Plugin Information

This is a fictitious plugin used to demonstrate what an MDL Shield security review looks like. This plugin does not exist.

moodle.org/plugins/local_fakequizanalytics

example/moodle-local_fakequizanalyticsv2.1.0

Version:2024031500

Release:2.1.0

Reviewed for:4.5

Privacy API

Unit Tests

Behat Tests

Reviewed:2024-03-15

47 files·8,420 lines

AI Summary

This plugin provides quiz analytics functionality with generally solid code structure. However, the security review identified several areas of concern, primarily around SQL query construction and output encoding. The most critical issues involve potential SQL injection vulnerabilities in the reporting module and missing capability checks on AJAX endpoints. The codebase follows Moodle coding standards reasonably well, but would benefit from consistent use of the Moodle database API and output functions.

Findings

securityCriticalVerified

SQL Injection in Report Filter

Exploitable by:

AuthenticatedStudent

User-supplied filter parameters are concatenated directly into SQL query without proper sanitization or use of bound parameters.

Risk Assessment

Impact: An attacker with basic Moodle access could extract or modify any data in the database, including user credentials and grades.

Likelihood: High — the vulnerable parameter is directly accessible via the report filter UI.

classes/report/analytics_report.php:142Source link unavailable — plugin was reviewed from zip without a matching git ref

Vulnerable Code

$sql = "SELECT * FROM {quiz_attempts} WHERE userid = " . $userid . " AND quiz IN (" . $quizids . ")"; $results = $DB->get_records_sql($sql);

Suggested Fix

$sql = "SELECT * FROM {quiz_attempts} WHERE userid = :userid AND quiz IN ($quizids)"; $params = ['userid' => $userid]; list($insql, $inparams) = $DB->get_in_or_equal($quizids, SQL_PARAMS_NAMED); $sql = "SELECT * FROM {quiz_attempts} WHERE userid = :userid AND quiz $insql"; $results = $DB->get_records_sql($sql, array_merge($params, $inparams));

Human Reviewer Note

Confirmed critical vulnerability. This is exploitable and must be fixed before release. The suggested fix correctly uses parameterized queries.

securityHighVerified

Missing Capability Check on AJAX Endpoint

Exploitable by:

Authenticated

The AJAX endpoint for fetching student data does not verify the user has the required capability before returning sensitive information.

ajax/get_student_data.php:28Source link unavailable — plugin was reviewed from zip without a matching git ref

Vulnerable Code

require_login(); $userid = required_param('userid', PARAM_INT); $data = get_student_analytics($userid); echo json_encode($data);

Suggested Fix

require_login(); $userid = required_param('userid', PARAM_INT); $context = context_course::instance($courseid); require_capability('local/quizanalytics:viewstudentdata', $context); $data = get_student_analytics($userid); echo json_encode($data);

Human Reviewer Note

Verified. Any authenticated user could access any student's analytics data. This is a significant privacy issue.

securityHighVerified

Cross-Site Scripting (XSS) in Dashboard Output

Exploitable by:

TeacherManager

User-supplied quiz names are output without proper encoding, allowing potential XSS attacks.

classes/output/dashboard_renderer.php:89Source link unavailable — plugin was reviewed from zip without a matching git ref

Vulnerable Code

$html .= '<h3>' . $quiz->name . '</h3>'; $html .= '<p>' . $quiz->intro . '</p>';

Suggested Fix

$html .= '<h3>' . format_string($quiz->name) . '</h3>'; $html .= '<p>' . format_text($quiz->intro, FORMAT_HTML) . '</p>';

Human Reviewer Note

Confirmed. While quiz names are typically set by teachers, this should still use proper output encoding for defense in depth.

securityMediumVerified

Missing Sesskey Validation

Form submission handler does not validate the sesskey, potentially allowing CSRF attacks.

settings_save.php:15Source link unavailable — plugin was reviewed from zip without a matching git ref

Affected Code

$action = optional_param('action', '', PARAM_ALPHA); if ($action === 'save') { save_plugin_settings($data); redirect($returnurl); }

Suggested Fix

$action = optional_param('action', '', PARAM_ALPHA); if ($action === 'save') { require_sesskey(); save_plugin_settings($data); redirect($returnurl); }

Human Reviewer Note

Confirmed. Standard Moodle CSRF protection pattern should be applied.

securityMediumVerified

Potential Path Traversal in Export

File export functionality does not properly sanitize the filename parameter.

export.php:52Source link unavailable — plugin was reviewed from zip without a matching git ref

Affected Code

$filename = required_param('filename', PARAM_TEXT); $filepath = $CFG->tempdir . '/' . $filename; file_put_contents($filepath, $content);

Suggested Fix

$filename = required_param('filename', PARAM_FILE); $filename = clean_filename($filename); $filepath = $CFG->tempdir . '/' . $filename; file_put_contents($filepath, $content);

Human Reviewer Note

Verified. Using PARAM_FILE and clean_filename() prevents directory traversal.

best practiceLowDisputed

Hardcoded Database Table Prefix

Direct reference to 'mdl_' prefix instead of using Moodle's table naming conventions.

db/install.php:34Source link unavailable — plugin was reviewed from zip without a matching git ref

Identified Code

$sql = "CREATE INDEX mdl_quizanalytics_idx ON mdl_local_fakequizanalytics (userid)";

Suggested Fix

// Use XMLDB or $DB methods instead $table = new xmldb_table('local_fakequizanalytics'); $index = new xmldb_index('userid_idx', XMLDB_INDEX_NOTUNIQUE, ['userid']); $dbman->add_index($table, $index);

Human Reviewer Note

False positive. This code is in a legacy migration script that only runs on specific older installations. The current install.xml handles this correctly. No action needed.

best practiceLowVerified

Deprecated Function Usage

Using deprecated get_context_instance() function instead of context_course::instance().

lib.php:78Source link unavailable — plugin was reviewed from zip without a matching git ref

Identified Code

$context = get_context_instance(CONTEXT_COURSE, $courseid);

Suggested Fix

$context = context_course::instance($courseid);

Human Reviewer Note

Confirmed. This deprecated function was removed in Moodle 4.0. Must be updated for compatibility.

best practiceInfoVerified

Consider Using Mustache Templates

HTML generation in PHP could be moved to Mustache templates for better separation of concerns.

classes/output/dashboard_renderer.php:45Source link unavailable — plugin was reviewed from zip without a matching git ref

Identified Code

$html = '<div class="analytics-card">'; $html .= '<h4>' . format_string($title) . '</h4>'; $html .= '<div class="stats">' . $stats . '</div>'; $html .= '</div>'; return $html;

Suggested Fix

return $this->render_from_template('local_fakequizanalytics/analytics_card', [ 'title' => format_string($title), 'stats' => $stats, ]);

Human Reviewer Note

Good suggestion for maintainability, but not a security issue. Consider for future refactoring.

Additional AI Notes

The plugin would benefit from adding PHPUnit tests, particularly for the analytics calculation functions.

Consider implementing caching for expensive database queries in the dashboard rendering.

Documentation for capability requirements would help administrators understand the access control model.

This review was generated by an AI system and may contain inaccuracies. Findings should be verified by a human reviewer before acting on them.

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