CVE-2025-2757
📋 TL;DR
A critical heap-based buffer overflow vulnerability in Assimp's MD5 file parser allows remote attackers to execute arbitrary code or cause denial of service by sending specially crafted MD5 files. This affects any application using Assimp library to process 3D model files, particularly those accepting untrusted MD5 format input.
💻 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, data theft, or ransomware deployment.
Likely Case
Application crash (denial of service) with potential for remote code execution in vulnerable configurations.
If Mitigated
Application crash with limited impact if proper sandboxing and memory protections are enabled.
🎯 Exploit Status
Exploit details are publicly disclosed in GitHub issues. Remote exploitation requires only a malicious MD5 file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Assimp release (5.4.4 or later)
Vendor Advisory: https://github.com/assimp/assimp/issues/6019
Restart Required: Yes
Instructions:
1. Update Assimp to latest version. 2. Recompile applications using Assimp. 3. Restart affected services.
🔧 Temporary Workarounds
Disable MD5 file processing
allDisable or remove MD5 file handler from Assimp configuration
Modify Assimp configuration to exclude MD5 importer
Input validation
allImplement strict validation of MD5 files before processing
Add file validation layer in application code
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems
- Deploy application sandboxing with strict memory protections
🔍 How to Verify
Check if Vulnerable:
Check if application uses Assimp version 5.4.3 or earlier and processes MD5 filesCheck Version:
assimp version (if CLI installed) or check library version in applicationVerify Fix Applied:
Verify Assimp version is updated and test with known malicious MD5 files📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing MD5 files
- Memory access violation errors
- Unexpected process termination
Network Indicators:
- Inbound transfer of MD5 files to vulnerable services
- Unusual outbound connections after MD5 file processing
SIEM Query:
Process:assimp AND (EventID:1000 OR ExceptionCode:c0000005)