CVE-2024-30097
📋 TL;DR
This vulnerability in Microsoft Speech API (SAPI) allows remote attackers to execute arbitrary code on affected systems by sending specially crafted requests. It affects Windows systems with SAPI enabled, potentially allowing attackers to take control of vulnerable machines.
💻 Affected Systems
- Microsoft Windows
📦 What is this software?
Windows 10 1507 by Microsoft
Windows 10 1607 by Microsoft
Windows 10 1809 by Microsoft
Windows 10 21h2 by Microsoft
Windows 10 22h2 by Microsoft
Windows 11 21h2 by Microsoft
Windows 11 22h2 by Microsoft
Windows 11 23h2 by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with administrative privileges, data theft, ransomware deployment, and lateral movement across the network.
Likely Case
Remote code execution leading to malware installation, credential theft, and persistence establishment on vulnerable systems.
If Mitigated
Limited impact with proper network segmentation, endpoint protection, and least privilege principles in place.
🎯 Exploit Status
Exploitation requires network access to vulnerable SAPI endpoints. No authentication is required for successful exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: May 2024 security updates (KB5037771 for Windows 11, KB5037768 for Windows 10, etc.)
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30097
Restart Required: Yes
Instructions:
1. Apply May 2024 Windows security updates via Windows Update. 2. For enterprise environments, deploy updates through WSUS or Microsoft Endpoint Configuration Manager. 3. Restart systems after update installation.
🔧 Temporary Workarounds
Disable SAPI services
windowsDisable Microsoft Speech API services if not required for business operations
sc config "SpeechService" start= disabled
sc stop "SpeechService"
Network segmentation
windowsRestrict network access to SAPI endpoints using firewall rules
netsh advfirewall firewall add rule name="Block SAPI" dir=in action=block protocol=TCP localport=443,80
🧯 If You Can't Patch
- Implement strict network segmentation to isolate systems with SAPI enabled
- Deploy endpoint detection and response (EDR) solutions with behavioral monitoring for RCE attempts
🔍 How to Verify
Check if Vulnerable:
Check if May 2024 security updates are installed via 'systeminfo' command or Windows Update historyCheck Version:
wmic qfe list | findstr KB5037771 or wmic qfe list | findstr KB5037768Verify Fix Applied:
Verify KB5037771 (Windows 11) or KB5037768 (Windows 10) is installed in Installed Updates📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from speech-related services
- Failed authentication attempts to SAPI endpoints
- Suspicious network connections to speech service ports
Network Indicators:
- Unusual traffic patterns to SAPI endpoints (typically ports 443/80)
- Malformed requests to speech API services
SIEM Query:
EventID=4688 AND (NewProcessName contains "powershell" OR NewProcessName contains "cmd") AND ParentProcessName contains "speech"