CVE-2025-3158
📋 TL;DR
A critical heap-based buffer overflow vulnerability exists in Assimp's LWO file handler. Attackers can exploit this by crafting malicious LWO files to potentially execute arbitrary code or crash applications. This affects any software using Assimp 5.4.3 to process LWO files.
💻 Affected Systems
- Open Asset Import Library (Assimp)
📦 What is this software?
Assimp by Assimp
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if exploited via malicious LWO file processing
Likely Case
Application crash (denial of service) when processing specially crafted LWO files
If Mitigated
Limited impact if file processing occurs in sandboxed environments with proper memory protections
🎯 Exploit Status
Exploit details are publicly disclosed; attackers need to trick users into opening malicious LWO files
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Assimp release (5.4.4 or newer)
Vendor Advisory: https://github.com/assimp/assimp/issues/6023
Restart Required: Yes
Instructions:
1. Update Assimp to latest version. 2. Rebuild applications using Assimp. 3. Restart affected services.
🔧 Temporary Workarounds
Disable LWO file processing
allRemove or disable LWO file handler in Assimp configuration
Modify Assimp configuration to exclude LWO importer
Sandbox file processing
allRun Assimp in isolated environment with limited privileges
Use containerization or sandboxing tools
🧯 If You Can't Patch
- Implement strict file validation for LWO files before processing
- Use application allowlisting to prevent unauthorized Assimp usage
🔍 How to Verify
Check if Vulnerable:
Check if Assimp version is 5.4.3 and LWO file processing is enabledCheck Version:
assimp version (if CLI installed) or check library version in applicationVerify Fix Applied:
Verify Assimp version is updated beyond 5.4.3📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing LWO files
- Memory access violation errors
Network Indicators:
- Unusual LWO file downloads to systems running Assimp
SIEM Query:
Process:assimp AND (EventID:1000 OR ExceptionCode:c0000005)