CVE-2020-28589
📋 TL;DR
CVE-2020-28589 is an improper array index validation vulnerability in tinyobjloader's LoadObj functionality that allows remote code execution via a malicious OBJ file. Attackers can exploit this by providing specially crafted files to applications using vulnerable versions of tinyobjloader. This affects any software that uses tinyobjloader v2.0-rc1 or development commit 79d4421 for 3D model loading.
💻 Affected Systems
- tinyobjloader
📦 What is this software?
Tinyobjloader by Tinyobjloader Project
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution with the privileges of the application using tinyobjloader, potentially leading to complete system compromise.
Likely Case
Application crash or denial of service, with potential for arbitrary code execution depending on how the library is integrated.
If Mitigated
Application crash without code execution if memory protections like ASLR are effective, but still a denial of service.
🎯 Exploit Status
Exploitation requires the target application to process a malicious OBJ file. The vulnerability is in array index validation, making exploitation relatively straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in tinyobjloader commit after 79d4421; users should update to latest version.
Vendor Advisory: https://github.com/tinyobjloader/tinyobjloader/security/advisories
Restart Required: Yes
Instructions:
1. Update tinyobjloader to the latest version from the official repository. 2. Recompile any applications that link against tinyobjloader. 3. Restart affected applications.
🔧 Temporary Workarounds
Input validation for OBJ files
allImplement strict validation of OBJ file inputs before processing with tinyobjloader.
Sandbox OBJ file processing
allRun OBJ file parsing in a sandboxed or isolated environment to limit potential damage.
🧯 If You Can't Patch
- Disable OBJ file processing from untrusted sources entirely.
- Implement application-level memory protections like ASLR and DEP if not already enabled.
🔍 How to Verify
Check if Vulnerable:
Check if your application uses tinyobjloader version v2.0-rc1 or commit 79d4421 by examining dependencies or build configurations.Check Version:
For source builds: check git commit hash or version in source code. For binaries: use dependency checking tools appropriate to your platform.Verify Fix Applied:
Verify that tinyobjloader has been updated to a version after the fix commit and that applications have been recompiled with the updated library.📡 Detection & Monitoring
Log Indicators:
- Application crashes or abnormal termination when processing OBJ files
- Unexpected memory access errors in application logs
Network Indicators:
- Unusual OBJ file uploads to web applications
- OBJ files with malformed indices or suspicious patterns
SIEM Query:
Example: search for 'tinyobjloader' AND ('crash' OR 'segmentation fault' OR 'access violation') in application logs