CVE-2024-21315
📋 TL;DR
This vulnerability in Microsoft Defender for Endpoint allows attackers to elevate privileges on affected systems. It enables local authenticated attackers to gain SYSTEM-level access by exploiting improper input validation. Organizations using vulnerable versions of Microsoft Defender for Endpoint are affected.
💻 Affected Systems
- Microsoft Defender for Endpoint
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full SYSTEM privileges, enabling complete system compromise, lateral movement, persistence establishment, and disabling of security controls.
Likely Case
Local authenticated attacker escalates privileges to SYSTEM to install malware, steal credentials, or bypass security restrictions.
If Mitigated
Limited to local authenticated users; proper patch management prevents exploitation.
🎯 Exploit Status
Microsoft rates this as 'Exploitation More Likely' in their advisory; requires local authenticated access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21315
Restart Required: Yes
Instructions:
1. Apply Microsoft's February 2024 security updates via Windows Update. 2. For enterprise environments, deploy through WSUS, Microsoft Endpoint Configuration Manager, or Microsoft Intune. 3. Restart systems after patch installation.
🔧 Temporary Workarounds
No official workaround available
windowsMicrosoft recommends applying security updates as the only mitigation
🧯 If You Can't Patch
- Restrict local authenticated access to sensitive systems
- Implement application control policies to limit unauthorized code execution
🔍 How to Verify
Check if Vulnerable:
Check if Microsoft Defender for Endpoint is installed and compare version against patched builds in Microsoft advisoryCheck Version:
wmic product get name,version | findstr /i defenderVerify Fix Applied:
Verify February 2024 security updates are installed via Windows Update history or system information📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation events in Windows Security logs
- Defender service manipulation attempts
- Process creation with SYSTEM privileges from non-standard accounts
Network Indicators:
- Not network exploitable; focus on host-based detection
SIEM Query:
EventID=4688 AND NewProcessName contains 'cmd.exe' OR 'powershell.exe' AND SubjectUserName != 'SYSTEM' AND TokenElevationType='%%1938'