CVE-2024-49102
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Windows systems running Routing and Remote Access Service (RRAS) without authentication. Attackers can exploit this heap-based buffer overflow to gain SYSTEM privileges on affected systems. Organizations using Windows servers with RRAS enabled are at risk.
💻 Affected Systems
- Windows Server
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
Windows 11 24h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with SYSTEM privileges, enabling attackers to install malware, steal credentials, pivot to other systems, and maintain persistent access.
Likely Case
Initial foothold leading to ransomware deployment, data exfiltration, or lateral movement within the network.
If Mitigated
Limited impact due to network segmentation, proper access controls, and monitoring that detects exploitation attempts.
🎯 Exploit Status
Microsoft rates this as 'Exploitation More Likely' in their advisory. The vulnerability requires no authentication and has low attack complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the latest Windows security updates from Microsoft's October 2024 Patch Tuesday or later
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49102
Restart Required: Yes
Instructions:
1. Apply Windows Server security updates from October 2024 or later. 2. Restart affected systems. 3. Verify RRAS service is running properly after update.
🔧 Temporary Workarounds
Disable RRAS Service
windowsStop and disable the Routing and Remote Access Service if not required
Stop-Service RemoteAccess
Set-Service RemoteAccess -StartupType Disabled
Block RRAS Ports
windowsBlock network access to RRAS ports (TCP 1723, UDP 1701, UDP 500, UDP 4500) at firewall
New-NetFirewallRule -DisplayName "Block RRAS" -Direction Inbound -Protocol TCP -LocalPort 1723 -Action Block
New-NetFirewallRule -DisplayName "Block RRAS UDP" -Direction Inbound -Protocol UDP -LocalPort 1701,500,4500 -Action Block
🧯 If You Can't Patch
- Disable RRAS service immediately if not required for business operations
- Implement strict network segmentation to isolate RRAS servers from critical assets
🔍 How to Verify
Check if Vulnerable:
Check if RRAS service is installed and running: Get-WindowsFeature -Name RemoteAccess | Select-Object Installed,InstallStateCheck Version:
systeminfo | findstr /B /C:"OS Name" /C:"OS Version"Verify Fix Applied:
Verify Windows Update history contains October 2024 security updates and RRAS service version is updated📡 Detection & Monitoring
Log Indicators:
- Event ID 4625 (failed logon) from RRAS service
- Unexpected RRAS service crashes in System logs
- Suspicious network connections to RRAS ports
Network Indicators:
- Unusual traffic patterns to RRAS ports (TCP 1723, UDP 1701, 500, 4500)
- Malformed packets targeting RRAS service
SIEM Query:
source="windows" AND (event_id=4625 AND service_name="RemoteAccess") OR (event_id=1000 AND source="RemoteAccess")