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The CVE-2025-XXXX vulnerability in Moodle exists within the logic enforcing time restrictions on assignments. The flaw allows a student to manipulate the assignment submission process after the designated time limit has expired. This is achieved by intercepting and altering the client-side request sent when submitting an assignment, specifically by modifying the timestamp or related parameters that indicate when the submission attempt was initiated. The application’s server-side validation fails to adequately verify the integrity and accuracy of this client-provided timing data against the actual server-side deadline. Consequently, a malicious student can craft a submission request that falsely appears to have been started before the time limit expired, thereby bypassing the intended access control and submitting their work late without penalty.
Platform: Moodle
Version: < 4.1.21
Vulnerability : Time Bypass
Severity: Moderate
date: 2024-10-23
Prediction: 2024-11-06
What Undercode Say:
Check current Moodle version php admin/cli/version.php Search for relevant assignment files find . -name "assign.php" -type f find . -name "submission.php" -type f
// Example snippet of vulnerable time check logic
$endtime = $assignment->get_end_time();
$userstarttime = $_POST['user_timestamp']; // Client-controlled, untrusted input
if ($userstarttime < $endtime) {
// Allow submission - this is the flawed logic
}
How Exploit:
1. Start assignment normally.
2. Let timer expire.
3. Intercept submission request with proxy.
4. Modify `user_timestamp` parameter.
5. Replay altered request to submit late.
Protection from this CVE
Upgrade to Moodle 4.1.21, 4.4.11, 4.5.7, or 5.0.3.
Implement server-side time validation.
Use server time for all deadline checks.
Reject submissions with client timestamps after deadline.
Impact:
Academic integrity compromised.
Unfair advantage for attackers.
Potential grade inflation.
Violation of assessment rules.
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Sources:
Reported By: github.com
Extra Source Hub:
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