CVE-2024-38077
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute arbitrary code on Windows systems running the Remote Desktop Licensing Service. It affects Windows servers with this service enabled, potentially giving attackers full system control. The high CVSS score reflects the ease of exploitation and severe impact.
💻 Affected Systems
- Windows Remote Desktop Licensing Service
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data theft, ransomware deployment, lateral movement across the network, and persistent backdoor installation.
Likely Case
Initial foothold for attackers to establish persistence, steal credentials, and move laterally to other systems in the environment.
If Mitigated
Limited impact due to network segmentation, strict firewall rules, and proper access controls preventing exploitation attempts.
🎯 Exploit Status
Based on CVSS 9.8 score and CWE-122 (Heap-based Buffer Overflow), exploitation is likely straightforward for attackers with network access to the service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply latest Windows security updates from Microsoft
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38077
Restart Required: Yes
Instructions:
1. Apply the latest Windows security updates from Microsoft
2. Restart affected Windows Server systems
3. Verify the Remote Desktop Licensing Service is updated
🔧 Temporary Workarounds
Disable Remote Desktop Licensing Service
windowsStop and disable the vulnerable service if not required
Stop-Service -Name TermServLicensing
Set-Service -Name TermServLicensing -StartupType Disabled
Block network access to service port
windowsRestrict network access to the Remote Desktop Licensing Service port (default TCP 135)
New-NetFirewallRule -DisplayName "Block RD Licensing" -Direction Inbound -Protocol TCP -LocalPort 135 -Action Block
🧯 If You Can't Patch
- Implement strict network segmentation to isolate systems running the service
- Deploy intrusion prevention systems (IPS) with rules to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if Remote Desktop Licensing Service is running and if system has unpatched Windows updatesCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history shows the latest security updates applied and service is either disabled or updated📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Remote Desktop Licensing Service
- Failed authentication attempts to the service
- Service crash or unexpected restart events
Network Indicators:
- Unusual network traffic to TCP port 135 from unexpected sources
- Multiple connection attempts to the licensing service
SIEM Query:
source="windows" AND (event_id=4688 OR event_id=4625) AND process_name="*TermServLicensing*"