CVE-2018-9091
📋 TL;DR
This critical vulnerability in KEMP LoadMaster LMOS allows unauthenticated remote attackers to bypass session management and execute elevated system commands. Attackers can gain system privileges, access sensitive data like certificates and private keys, and fully compromise affected systems. Organizations running vulnerable versions of KEMP LoadMaster are at risk.
💻 Affected Systems
- KEMP LoadMaster Operating System (LMOS)
📦 What is this software?
Loadmaster Operating System by Kemptechnologies
Loadmaster Operating System by Kemptechnologies
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative access, exposure of all sensitive data including SSL certificates and private keys, and potential lateral movement to other systems.
Likely Case
Remote code execution leading to data theft, service disruption, and installation of persistent backdoors or malware.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external exploitation, though internal threats remain.
🎯 Exploit Status
Vulnerability allows unauthenticated remote execution with low complexity, making weaponization highly probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: LMOS 7.2.42 and LTS LMOS 7.1.35.5 or later
Vendor Advisory: https://support.kemptechnologies.com/hc/en-us/articles/360001982452-Mitigation-for-Remote-Access-Execution-Vulnerability
Restart Required: Yes
Instructions:
1. Log into LoadMaster web interface. 2. Navigate to System Administration > System Upgrade. 3. Upload and apply the patched firmware version. 4. Reboot the LoadMaster to complete the update.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to LoadMaster management interfaces to trusted IP addresses only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate LoadMaster from untrusted networks
- Deploy network-based intrusion prevention systems (IPS) to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check LoadMaster version via web interface: System Configuration > System Administration > System InformationCheck Version:
Not applicable - use web interface as LoadMaster uses proprietary OSVerify Fix Applied:
Verify version is 7.2.42 or later for standard LMOS, or 7.1.35.5 or later for LTS LMOS📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to management interfaces
- Unusual command execution patterns in system logs
Network Indicators:
- Unexpected traffic to LoadMaster management ports (443, 8443)
- Anomalous outbound connections from LoadMaster
SIEM Query:
source="loadmaster" AND (event_type="authentication_failure" OR command="ls" OR command="cat" OR command="ps")