CVE-2020-18232
📋 TL;DR
CVE-2020-18232 is a buffer overflow vulnerability in the HDF5 library's H5S_close function that allows remote attackers to execute arbitrary code by tricking users or systems into processing a specially crafted HDF5 file. This affects any application or system using HDF5 1.10.4 to read external files. Attackers could gain full control of affected systems through this vulnerability.
💻 Affected Systems
- HDF5 library
- Applications using HDF5 (scientific software, data analysis tools, visualization software)
📦 What is this software?
Hdf5 by Hdfgroup
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, ransomware deployment, or lateral movement within networks.
Likely Case
Attackers create malicious HDF5 files and distribute them via phishing, compromised websites, or shared repositories, leading to system compromise when opened.
If Mitigated
Systems with proper input validation, file type restrictions, and least privilege execution would limit impact to denial of service or isolated process crashes.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repositories. Exploitation requires victim to process a malicious file, which can be delivered via various attack vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HDF5 1.10.5 and later
Vendor Advisory: https://portal.hdfgroup.org/display/support/security
Restart Required: No
Instructions:
1. Download HDF5 1.10.5 or later from official HDF Group website. 2. Uninstall vulnerable HDF5 version. 3. Install patched version. 4. Recompile any applications that statically link HDF5.
🔧 Temporary Workarounds
File type restriction
allBlock processing of HDF5 files from untrusted sources using application whitelisting or file type restrictions.
Sandbox execution
allRun HDF5-dependent applications in sandboxed environments or containers with limited privileges.
🧯 If You Can't Patch
- Implement strict file validation: only allow HDF5 files from trusted sources with integrity verification.
- Deploy application control solutions to prevent execution of HDF5 processing tools from untrusted locations.
🔍 How to Verify
Check if Vulnerable:
Check HDF5 library version: h5dump --version or check linked library version in applications.Check Version:
h5dump --version | grep -i versionVerify Fix Applied:
Verify installed HDF5 version is 1.10.5 or later using h5dump --version command.📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing HDF5 files
- Unusual process spawning from HDF5-related applications
- Memory access violation errors in application logs
Network Indicators:
- Downloads of HDF5 files from unusual sources
- Outbound connections from HDF5 applications to unexpected destinations
SIEM Query:
Process creation where parent process is h5dump or related HDF5 tool AND command line contains file path from untrusted source