CVE-2024-36451
📋 TL;DR
This vulnerability in Webmin's ajaxterm module allows unauthorized users to hijack console sessions when insufficient permissions are improperly handled. It affects Webmin versions prior to 2.003, potentially exposing system data, allowing webpage alteration, or causing server shutdowns.
💻 Affected Systems
- Webmin
📦 What is this software?
Webmin by Webmin
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through session hijacking leading to data theft, website defacement, or permanent server shutdown.
Likely Case
Unauthorized access to console sessions resulting in data exposure or limited system manipulation.
If Mitigated
Minimal impact if proper access controls and network segmentation are implemented.
🎯 Exploit Status
Exploitation requires some level of access but leverages improper permission handling.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.003
Vendor Advisory: https://webmin.com/
Restart Required: Yes
Instructions:
1. Backup your Webmin configuration. 2. Update Webmin to version 2.003 or later using the built-in update mechanism or package manager. 3. Restart the Webmin service.
🔧 Temporary Workarounds
Disable ajaxterm module
linuxTemporarily disable the vulnerable ajaxterm module to prevent exploitation.
webmin-config --disable ajaxterm
Restrict network access
allLimit Webmin access to trusted IP addresses only.
Configure firewall rules to restrict access to Webmin port (default 10000)
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Webmin servers
- Enforce strong authentication and monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check Webmin version via web interface or command: cat /etc/webmin/versionCheck Version:
cat /etc/webmin/versionVerify Fix Applied:
Verify version is 2.003 or higher and ajaxterm module is either updated or disabled.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to ajaxterm endpoints in Webmin logs
- Unexpected console session creations
Network Indicators:
- Unusual traffic patterns to Webmin's ajaxterm port
SIEM Query:
source="webmin.log" AND (ajaxterm OR session_hijack)