CVE-2024-30102
📋 TL;DR
CVE-2024-30102 is a use-after-free vulnerability (CWE-416) in Microsoft Office that allows remote code execution when a user opens a specially crafted malicious document. Attackers can exploit this to execute arbitrary code with the privileges of the current user. All users running affected Microsoft Office versions are vulnerable.
💻 Affected Systems
- Microsoft Office
- Microsoft 365 Apps
📦 What is this software?
365 Apps by Microsoft
365 Apps by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the victim's computer, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Malware installation, credential theft, and data exfiltration through malicious Office documents delivered via phishing or compromised websites.
If Mitigated
Limited impact with proper application sandboxing, macro restrictions, and user training preventing successful exploitation.
🎯 Exploit Status
Requires user to open malicious document. No public exploit available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft's monthly security updates for specific patch versions
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-30102
Restart Required: Yes
Instructions:
1. Open any Office application
2. Go to File > Account > Update Options > Update Now
3. Alternatively, use Windows Update for system-wide Office updates
4. Restart computer after installation
🔧 Temporary Workarounds
Disable Office document preview
windowsPrevents automatic parsing of malicious documents in Windows Explorer preview pane
Use Office Viewer mode
windowsOpen documents in Protected View or Read-Only mode to prevent code execution
🧯 If You Can't Patch
- Implement application allowlisting to restrict Office execution
- Deploy email filtering to block malicious attachments and enable macro restrictions
🔍 How to Verify
Check if Vulnerable:
Check Office version against Microsoft's security update guidance for CVE-2024-30102Check Version:
In Office app: File > Account > About [Application Name]Verify Fix Applied:
Verify Office is updated to latest version and security update KB number is installed📡 Detection & Monitoring
Log Indicators:
- Office application crashes with memory access violations
- Suspicious child processes spawned from Office applications
- Unusual Office document access patterns
Network Indicators:
- Outbound connections from Office processes to suspicious IPs
- DNS requests for known malicious domains from Office context
SIEM Query:
Process Creation where Parent Process contains 'winword.exe' or 'excel.exe' or 'powerpnt.exe' and Command Line contains suspicious patterns