CVE-2025-47436
📋 TL;DR
A heap-based buffer overflow vulnerability in Apache ORC's C++ LZO decompression logic allows attackers to cause memory corruption by providing specially crafted malformed ORC files. This affects all systems using vulnerable versions of the Apache ORC C++ library for processing ORC files. Successful exploitation could lead to arbitrary code execution or denial of service.
💻 Affected Systems
- Apache ORC C++ library
📦 What is this software?
Orc by Apache
Orc by Apache
Orc by Apache
Orc by Apache
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the ORC processing service, potentially leading to full system compromise.
Likely Case
Denial of service through application crashes or memory corruption leading to instability.
If Mitigated
Limited impact if proper input validation and sandboxing are implemented, though memory corruption risks remain.
🎯 Exploit Status
The vulnerability is in file parsing logic, making exploitation straightforward once a proof-of-concept is developed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.8.9, 1.9.6, 2.0.5, 2.1.2
Vendor Advisory: https://orc.apache.org/security/CVE-2025-47436/
Restart Required: Yes
Instructions:
1. Identify ORC library version. 2. Upgrade to patched version matching your major version. 3. Recompile applications using the library. 4. Restart affected services.
🔧 Temporary Workarounds
Input validation and filtering
allImplement strict validation of ORC files before processing, rejecting malformed or suspicious files.
Sandbox ORC processing
allRun ORC file processing in isolated containers or sandboxes with minimal privileges.
🧯 If You Can't Patch
- Implement network segmentation to isolate systems processing ORC files from critical infrastructure.
- Deploy application allowlisting to prevent execution of unauthorized code resulting from exploitation.
🔍 How to Verify
Check if Vulnerable:
Check ORC library version using package manager or by examining linked libraries in applications.Check Version:
ldd /path/to/application | grep orc OR check package manager (e.g., dpkg -l | grep liborc)Verify Fix Applied:
Verify upgraded version matches patched versions (1.8.9, 1.9.6, 2.0.5, or 2.1.2).📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in system logs
- Unexpected process termination
Network Indicators:
- Unusual ORC file transfers to processing systems
- Network traffic spikes to ORC processing services
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "buffer overflow" OR "memory corruption") AND process="*orc*"