CVE-2020-4545
📋 TL;DR
CVE-2020-4545 is a DLL hijacking vulnerability in IBM Aspera Connect that allows remote code execution. Attackers can exploit this by tricking users into opening malicious DLL files, potentially compromising affected systems. This affects IBM Aspera Connect users on Windows systems.
💻 Affected Systems
- IBM Aspera Connect
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Attacker executes arbitrary code with the privileges of the Aspera Connect user, potentially installing malware, stealing credentials, or establishing persistence on the system.
If Mitigated
Limited impact with proper user training and security controls preventing execution of untrusted DLL files.
🎯 Exploit Status
Exploitation requires social engineering to persuade user to open malicious DLL file. No authentication required for the initial file opening.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: IBM Aspera Connect 3.9.9.1 and later
Vendor Advisory: https://www.ibm.com/support/pages/node/6326537
Restart Required: Yes
Instructions:
1. Download latest version from IBM Aspera Connect download page. 2. Uninstall current version. 3. Install updated version. 4. Restart system.
🔧 Temporary Workarounds
Restrict DLL loading locations
windowsConfigure Windows to restrict DLL loading to trusted directories only
Use Windows Group Policy to configure DLL search order restrictions
User training and awareness
allEducate users not to open untrusted DLL files from unknown sources
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized DLL files
- Use endpoint protection with DLL hijacking detection capabilities
🔍 How to Verify
Check if Vulnerable:
Check Aspera Connect version in Help > About or via Windows Programs and FeaturesCheck Version:
wmic product where name='IBM Aspera Connect' get versionVerify Fix Applied:
Verify version is 3.9.9.1 or later in Help > About menu📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing DLL loading from unusual locations
- Process creation events for Aspera Connect loading unexpected DLLs
Network Indicators:
- Unusual outbound connections from Aspera Connect process
SIEM Query:
process_name='asperaconnect.exe' AND (file_path CONTAINS '.dll' AND NOT file_path CONTAINS 'Program Files')