CVE-2023-36487
📋 TL;DR
CVE-2023-36487 is a critical authentication bypass vulnerability in ILIAS learning management system that allows remote attackers to take over user accounts via the password reset function. Attackers can reset passwords for arbitrary accounts without authorization. This affects all ILIAS installations with vulnerable versions exposed to network access.
💻 Affected Systems
- ILIAS Learning Management System
📦 What is this software?
Ilias by Ilias
Ilias by Ilias
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of all user accounts including administrators, leading to data theft, privilege escalation, and full system control.
Likely Case
Account takeover of regular users leading to unauthorized access to courses, personal data, and potentially lateral movement within the system.
If Mitigated
Limited impact with proper network segmentation and monitoring, but still potential for individual account compromise.
🎯 Exploit Status
The vulnerability is in the password reset mechanism which is typically exposed and easy to target.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: ILIAS 7.21 and 8.2
Restart Required: No
Instructions:
1. Backup your ILIAS installation and database. 2. Download the patched version (7.21 or 8.2). 3. Follow the ILIAS upgrade documentation. 4. Verify the password reset functionality works correctly after upgrade.
🔧 Temporary Workarounds
Disable password reset functionality
allTemporarily disable the password reset feature to prevent exploitation while planning upgrade.
# Modify ILIAS configuration to disable password reset - consult ILIAS documentation for specific method
Implement rate limiting on password reset endpoint
linuxAdd web application firewall rules to limit requests to password reset functionality.
# Example for Apache mod_sec: SecRule REQUEST_URI "@contains /ilias.php?cmdClass=ilpasswordresetgui" "id:1001,phase:2,deny,status:403"
🧯 If You Can't Patch
- Implement network-level restrictions to limit access to ILIAS to trusted IP addresses only
- Enable detailed logging for all password reset attempts and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check ILIAS version in administration panel or by examining the installation files. Versions 7.0_beta1-7.20 or 8.0_beta1-8.1 are vulnerable.Check Version:
# Check ILIAS version via web interface: Admin > System > Version Information or check includes/ilias_version.phpVerify Fix Applied:
After upgrading to 7.21 or 8.2, test password reset functionality to ensure it requires proper authentication and verification.📡 Detection & Monitoring
Log Indicators:
- Multiple failed password reset attempts from single IP
- Successful password resets for multiple accounts from same source
- Password reset requests without proper session tokens
Network Indicators:
- Unusual patterns of POST requests to password reset endpoints
- High volume of requests to /ilias.php with password reset parameters
SIEM Query:
source="web_access.log" AND (uri="*ilpasswordresetgui*" OR uri="*password*reset*") AND status=200 | stats count by src_ip🔗 References
- https://docu.ilias.de/ilias.php?ref_id=1719&obj_id=141694&obj_type=PageObject&cmd=layout&cmdClass=illmpresentationgui&cmdNode=13g&baseClass=ilLMPresentationGUI
- https://docu.ilias.de/ilias.php?ref_id=1719&obj_id=141703&obj_type=PageObject&cmd=layout&cmdClass=illmpresentationgui&cmdNode=13g&baseClass=ilLMPresentationGUI
- https://docu.ilias.de/ilias.php?ref_id=1719&obj_id=141694&obj_type=PageObject&cmd=layout&cmdClass=illmpresentationgui&cmdNode=13g&baseClass=ilLMPresentationGUI
- https://docu.ilias.de/ilias.php?ref_id=1719&obj_id=141703&obj_type=PageObject&cmd=layout&cmdClass=illmpresentationgui&cmdNode=13g&baseClass=ilLMPresentationGUI
