CVE-2024-30070
📋 TL;DR
This vulnerability in the DHCP Server service allows an attacker to send specially crafted packets that cause a denial of service (DoS) condition. The service crashes, preventing DHCP assignment to clients. This affects Windows Server systems running the DHCP Server role.
💻 Affected Systems
- Windows Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete DHCP service outage across the network, preventing new clients from obtaining IP addresses and disrupting network connectivity for all DHCP-dependent devices.
Likely Case
DHCP service crashes, requiring manual restart and causing temporary network disruption until service is restored.
If Mitigated
Minimal impact with proper network segmentation and monitoring; service automatically restarts or fails over to redundant DHCP servers.
🎯 Exploit Status
Exploitation requires network access to the DHCP service port (UDP 67/68). No authentication is needed to send DHCP packets.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2024 security updates (KB5037765 for Server 2022, KB5037763 for Server 2019)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30070
Restart Required: Yes
Instructions:
1. Apply May 2024 Windows Server security updates via Windows Update. 2. Restart the server to complete installation. 3. Verify DHCP service is running normally after restart.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to DHCP servers to only trusted subnets and required clients
DHCP Failover Configuration
windowsConfigure DHCP failover to maintain service if primary server is compromised
🧯 If You Can't Patch
- Implement strict network ACLs to limit access to DHCP servers (UDP ports 67/68)
- Monitor DHCP service health and implement automated restart scripts for service crashes
🔍 How to Verify
Check if Vulnerable:
Check if DHCP Server role is installed and running on Windows Server 2019/2022 without May 2024 security updatesCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify May 2024 security updates are installed and DHCP service remains stable when receiving test DHCP requests📡 Detection & Monitoring
Log Indicators:
- DHCP service crash events in Windows Event Log (Event ID 7031, 7034)
- Unexpected DHCP service restarts
Network Indicators:
- Unusual DHCP packet patterns from single source
- DHCP DISCOVER/OFFER/REQUEST packets with malformed options
SIEM Query:
EventID=7031 OR EventID=7034 AND ServiceName="DHCPServer"