CVE-2023-25143
📋 TL;DR
This vulnerability in Trend Micro Apex One Server installer allows attackers to execute arbitrary code remotely by exploiting an uncontrolled search path element. Attackers can place malicious DLLs in locations the installer searches, leading to remote code execution. All systems running vulnerable versions of Trend Micro Apex One are affected.
💻 Affected Systems
- Trend Micro Apex One
📦 What is this software?
Apex One by Trendmicro
Apex One by Trendmicro
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with administrative privileges, enabling data theft, ransomware deployment, and persistent backdoor installation across the network.
Likely Case
Remote code execution leading to malware installation, credential harvesting, and lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation and least privilege controls, potentially containing the attack to isolated segments.
🎯 Exploit Status
CVSS 9.8 indicates critical severity with low attack complexity. While no public PoC is confirmed, the high score suggests weaponization is likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2019 (Build 11110) and SaaS 2020 (Build 11340)
Vendor Advisory: https://success.trendmicro.com/solution/000292209
Restart Required: Yes
Instructions:
1. Download the latest patch from Trend Micro support portal. 2. Apply the patch to all affected Apex One servers. 3. Restart the server to complete installation. 4. Verify the patch is applied successfully.
🔧 Temporary Workarounds
Restrict DLL search paths
windowsConfigure Windows to restrict DLL search paths and prevent loading from untrusted locations
Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager' -Name 'SafeDllSearchMode' -Value 1
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Apex One servers from untrusted networks
- Apply principle of least privilege to service accounts and restrict file system permissions
🔍 How to Verify
Check if Vulnerable:
Check Apex One server version in the product console or via registry: HKEY_LOCAL_MACHINE\SOFTWARE\TrendMicro\Apex One\CurrentVersionCheck Version:
reg query "HKLM\SOFTWARE\TrendMicro\Apex One\CurrentVersion" /v ProductVersionVerify Fix Applied:
Verify version is 2019 (Build 11110) or higher, or SaaS 2020 (Build 11340) or higher📡 Detection & Monitoring
Log Indicators:
- Unusual DLL loading events in Windows Event Logs (Event ID 7)
- Suspicious process creation from Apex One installer paths
Network Indicators:
- Unexpected outbound connections from Apex One servers
- Anomalous network traffic patterns from management ports
SIEM Query:
source="windows" EventID=7 (ImageLoaded contains "ApexOne" OR ProcessName contains "ApexOne")