CVE-2023-38151
📋 TL;DR
This vulnerability in Microsoft Host Integration Server 2020 allows remote attackers to execute arbitrary code on affected systems. Attackers can exploit this without authentication to gain full control of the server. Organizations using Microsoft Host Integration Server 2020 are affected.
💻 Affected Systems
- Microsoft Host Integration Server 2020
📦 What is this software?
Ole Db Provider by Microsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining SYSTEM/administrator privileges, enabling data theft, lateral movement, ransomware deployment, and persistent backdoor installation.
Likely Case
Remote code execution leading to service disruption, credential harvesting, and initial foothold for further network exploitation.
If Mitigated
Limited impact due to network segmentation, strict firewall rules, and proper access controls preventing 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: Security update released in September 2023
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38151
Restart Required: Yes
Instructions:
1. Download the security update from Microsoft Update Catalog. 2. Apply the update to all affected Host Integration Server 2020 instances. 3. Restart the server to complete installation.
🔧 Temporary Workarounds
Network Segmentation
allRestrict network access to Host Integration Server 2020 to only trusted hosts and networks
Firewall Rules
windowsBlock unnecessary inbound ports to Host Integration Server using Windows Firewall or network firewall
New-NetFirewallRule -DisplayName "Block HIS Ports" -Direction Inbound -LocalPort 1433,1434 -Protocol TCP -Action Block
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Host Integration Server from untrusted networks
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check if Host Integration Server 2020 is installed and if the September 2023 security update is not appliedCheck Version:
Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*Host Integration Server*"} | Select-Object Name, VersionVerify Fix Applied:
Verify the security update is installed via Windows Update history or by checking file versions📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from HIS services
- Failed authentication attempts followed by successful exploitation
- Windows Event Log entries showing unexpected service restarts
Network Indicators:
- Unusual network connections from HIS server to external IPs
- Suspicious payloads in network traffic to HIS ports
SIEM Query:
source="windows" AND (event_id=4688 OR event_id=4625) AND process_name="*his*"