CVE-2025-2151
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Assimp's GetNextLine function allows remote attackers to execute arbitrary code or crash applications. This affects any software using the vulnerable Assimp library version to process 3D model files. Attackers can exploit this by sending malicious files to applications that parse them with Assimp.
💻 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 crashes causing denial of service, potentially leading to data corruption in 3D processing applications.
If Mitigated
Limited impact with proper input validation and memory protections, potentially just crashes without code execution.
🎯 Exploit Status
Proof-of-concept crash files are publicly available. Remote exploitation requires file processing, which is common in 3D applications and game engines.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest Assimp release (5.4.4 or later)
Vendor Advisory: https://github.com/assimp/assimp/issues/6016
Restart Required: Yes
Instructions:
1. Update Assimp to latest patched version. 2. Recompile applications using Assimp. 3. Restart affected services. 4. Test with known malicious files to verify fix.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for 3D model files before passing to Assimp
Memory Protection
allEnable ASLR, DEP, and stack canaries in compiled applications
gcc -fstack-protector-all -D_FORTIFY_SOURCE=2 (Linux)
/DYNAMICBASE /NXCOMPAT (Windows)
🧯 If You Can't Patch
- Isolate Assimp processing to sandboxed environments with minimal privileges
- Implement network segmentation to limit access to vulnerable systems
🔍 How to Verify
Check if Vulnerable:
Check Assimp version in use: assimp version or examine linked librariesCheck Version:
assimp version or check library version in application dependenciesVerify Fix Applied:
Test with provided PoC crash files - they should not cause crashes in patched version📡 Detection & Monitoring
Log Indicators:
- Application crashes with stack overflow errors
- Abnormal termination of 3D file processing services
Network Indicators:
- Unexpected large file uploads to 3D processing endpoints
- Multiple failed parsing attempts
SIEM Query:
source="application.log" AND ("stack overflow" OR "buffer overflow" OR "assimp" OR "GetNextLine")🔗 References
- https://github.com/assimp/assimp/issues/6016
- https://github.com/assimp/assimp/issues/6026
- https://github.com/sae-as-me/Crashes/raw/refs/heads/main/assimp/assimp_crash_1
- https://vuldb.com/?ctiid.299062
- https://vuldb.com/?id.299062
- https://vuldb.com/?submit.510582
- https://github.com/assimp/assimp/issues/6016
- https://github.com/assimp/assimp/issues/6026
