CVE-2025-44904
📋 TL;DR
CVE-2025-44904 is a heap buffer overflow vulnerability in HDF5 library v1.14.6 that allows attackers to execute arbitrary code or cause denial of service by exploiting the H5VM_memcpyvv function. This affects any application or system using the vulnerable HDF5 library version for reading or writing HDF5 files. The vulnerability is particularly concerning for scientific computing, data analysis, and storage systems that rely on HDF5 format.
💻 Affected Systems
- HDF5 library
- Applications using HDF5 library (e.g., scientific software, data analysis tools, storage systems)
📦 What is this software?
Hdf5 by Hdfgroup
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment if exploited against vulnerable services processing malicious HDF5 files.
Likely Case
Denial of service through application crashes when processing specially crafted HDF5 files, potentially disrupting data processing pipelines or scientific workflows.
If Mitigated
Limited impact with proper network segmentation, file validation, and least privilege principles preventing exploitation from reaching critical systems.
🎯 Exploit Status
Proof-of-concept code is publicly available, making exploitation straightforward for attackers with access to malicious HDF5 files. No authentication required to trigger the vulnerability through file processing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.14.7 or later
Vendor Advisory: https://www.hdfgroup.org/2025/01/security-advisory-hdf5-1-14-6-heap-buffer-overflow/
Restart Required: Yes
Instructions:
1. Check current HDF5 version: h5dump --version
2. Download latest HDF5 release from https://www.hdfgroup.org/downloads/hdf5/
3. Compile and install new version following official documentation
4. Recompile any applications using HDF5 against the patched library
5. Restart affected services and applications
🔧 Temporary Workarounds
Input Validation for HDF5 Files
allImplement strict validation of HDF5 files before processing to reject potentially malicious inputs
# Example using h5dump for basic validation
h5dump --header-only suspicious_file.h5 || echo 'Invalid HDF5 file'
Sandbox HDF5 Processing
linuxRun HDF5 file processing in isolated containers or sandboxes with limited privileges
# Example Docker command for isolated processing
docker run --read-only --cap-drop=ALL -v /safe/input:/input hdf5-processor
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using HDF5 from untrusted networks
- Deploy application allowlisting to prevent execution of unauthorized binaries that might exploit the vulnerability
🔍 How to Verify
Check if Vulnerable:
Check HDF5 library version: h5dump --version | grep 'HDF5' and verify if it's v1.14.6Check Version:
h5dump --version | grep 'HDF5'Verify Fix Applied:
Verify version is v1.14.7 or later: h5dump --version | grep -E 'HDF5.*1\.(1[4-9]|[2-9][0-9])\.[7-9]|[0-9]+'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults in HDF5-related functions
- Memory corruption errors in system logs when processing HDF5 files
- Unusual process termination of applications using HDF5 library
Network Indicators:
- Unexpected HDF5 file transfers to sensitive systems
- Network traffic patterns showing HDF5 file processing followed by crashes
SIEM Query:
source="*syslog*" AND ("segmentation fault" OR "SIGSEGV") AND ("H5VM_memcpyvv" OR "HDF5" OR ".h5")