CVE-2025-64181
📋 TL;DR
OpenEXR versions 3.3.0-3.3.5 and 3.4.0-3.4.2 contain a use of uninitialized memory vulnerability in the generic_unpack function. This can cause undefined behavior, crashes, or denial of service when processing malicious EXR image files. Anyone using affected OpenEXR versions to parse EXR files is vulnerable.
💻 Affected Systems
- OpenEXR
📦 What is this software?
Openexr by Openexr
Openexr by Openexr
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise if the uninitialized memory access can be weaponized for memory corruption attacks.
Likely Case
Application crash or denial of service when processing specially crafted EXR files, disrupting image processing workflows.
If Mitigated
No impact if patched versions are used or if EXR file processing is isolated in sandboxed environments.
🎯 Exploit Status
Exploitation requires crafting a malicious EXR file that triggers the uninitialized memory access. No public exploits are known, but the vulnerability is in file parsing code that accepts external input.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.3.6 or 3.4.3
Vendor Advisory: https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq
Restart Required: Yes
Instructions:
1. Identify OpenEXR version currently installed. 2. Update to OpenEXR 3.3.6 or 3.4.3 using your package manager or by compiling from source. 3. Restart any applications or services using OpenEXR. 4. Recompile any applications statically linked to OpenEXR.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict validation of EXR files before processing, rejecting malformed or suspicious files.
Sandbox EXR processing
allIsolate EXR file processing in containerized or sandboxed environments to limit potential impact.
🧯 If You Can't Patch
- Restrict EXR file processing to trusted sources only
- Implement network segmentation to isolate systems processing EXR files
🔍 How to Verify
Check if Vulnerable:
Check OpenEXR version: 'exrheader --version' or check library version in your application. If version is between 3.3.0-3.3.5 or 3.4.0-3.4.2, you are vulnerable.Check Version:
exrheader --version 2>/dev/null || pkg-config --modversion OpenEXR || find /usr -name '*openexr*' -type f | head -5Verify Fix Applied:
After updating, verify version shows 3.3.6 or 3.4.3. Test with known EXR files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing EXR files
- Memory access violation errors in application logs
- Unexpected termination of image processing services
Network Indicators:
- Unusual EXR file uploads to web applications
- Multiple failed EXR processing attempts
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "memory violation" OR "crash") AND ("exr" OR "openexr")🔗 References
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq
- https://github.com/user-attachments/files/23024726/archive0.zip
- https://github.com/user-attachments/files/23024736/archive1.zip
- https://github.com/user-attachments/files/23024740/archive2.zip
- https://github.com/user-attachments/files/23024744/archive3.zip
- https://github.com/user-attachments/files/23024746/archive4.zip
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-3h9h-qfvw-98hq
