CVE-2024-38018
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Microsoft SharePoint Server by exploiting insecure deserialization. It affects organizations running vulnerable SharePoint Server versions, potentially enabling complete system compromise.
💻 Affected Systems
- Microsoft SharePoint Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to data theft, ransomware deployment, lateral movement across the network, and persistent backdoor installation.
Likely Case
Unauthorized access to sensitive SharePoint data, privilege escalation, and installation of web shells for ongoing access.
If Mitigated
Limited impact with proper network segmentation, application controls, and monitoring detecting exploitation attempts.
🎯 Exploit Status
CWE-502 indicates deserialization vulnerability; exploitation typically requires some authentication but could be chained with other vulnerabilities.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update for specific patch version
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-38018
Restart Required: Yes
Instructions:
1. Apply latest Microsoft SharePoint Server security update from Windows Update or Microsoft Update Catalog
2. Restart SharePoint Server services
3. Test functionality after patching
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to SharePoint Server to only trusted IP addresses
Disable Unnecessary Features
windowsDisable any unused SharePoint features or services to reduce attack surface
🧯 If You Can't Patch
- Implement strict network access controls and firewall rules limiting SharePoint access
- Enable enhanced logging and monitoring for suspicious SharePoint activity
🔍 How to Verify
Check if Vulnerable:
Check SharePoint Server version against Microsoft Security Update Guide for CVE-2024-38018Check Version:
Get-SPFarm | Select BuildVersion (PowerShell)Verify Fix Applied:
Verify patch installation via Windows Update history or by checking SharePoint version matches patched version📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from SharePoint processes
- Suspicious deserialization errors in SharePoint logs
- Unexpected authentication attempts
Network Indicators:
- Unusual outbound connections from SharePoint Server
- Suspicious HTTP requests to SharePoint endpoints
SIEM Query:
source="sharepoint*" AND (event_id=6398 OR event_id=6399 OR "deserialization")