CVE-2025-14934
📋 TL;DR
This is a stack-based buffer overflow vulnerability in NSF Unidata NetCDF-C that allows remote attackers to execute arbitrary code. Attackers can exploit it by tricking users into opening malicious NetCDF files or visiting malicious web pages. Users and applications that process untrusted NetCDF files are affected.
💻 Affected Systems
- NSF Unidata NetCDF-C
📦 What is this software?
Netcdf by Unidata
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the user running the vulnerable NetCDF-C application, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation or application crash leading to denial of service, with potential for data exfiltration if the application handles sensitive information.
If Mitigated
Application crash with no code execution if exploit fails or protections like ASLR/DEP are effective, resulting in denial of service only.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file or visiting malicious page). The vulnerability is in ZDI's database as ZDI-CAN-27267, suggesting it was responsibly disclosed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.unidata.ucar.edu/software/netcdf/
Restart Required: Yes
Instructions:
1. Check current NetCDF-C version using 'nc-config --version' or similar
2. Visit Unidata NetCDF advisory page for patch details
3. Update NetCDF-C library using package manager or compile from source
4. Restart any applications using NetCDF-C
🔧 Temporary Workarounds
Input Validation Wrapper
allImplement custom input validation for NetCDF variable names before passing to library
# Implement in application code: validate variable name length before processing
Memory Protection
allEnable ASLR, DEP, and stack canaries if not already enabled
# Linux: check with 'sysctl kernel.randomize_va_space' (should be 2)
# Windows: Ensure DEP is enabled in system properties
🧯 If You Can't Patch
- Implement strict file validation: only allow NetCDF files from trusted sources
- Run NetCDF processing in sandboxed/containerized environment with minimal privileges
🔍 How to Verify
Check if Vulnerable:
Check NetCDF-C version and compare against patched version in vendor advisoryCheck Version:
nc-config --version 2>/dev/null || ncdump --version 2>/dev/null || find /usr -name '*netcdf*' -type f -executable 2>/dev/null | head -5Verify Fix Applied:
Verify updated version is installed and test with known safe NetCDF files📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults when processing NetCDF files
- Unusual process spawning from NetCDF-related applications
- Large or malformed variable names in file processing logs
Network Indicators:
- Downloads of NetCDF files from untrusted sources
- Unexpected network connections from NetCDF processing applications
SIEM Query:
source="*netcdf*" AND (event_type="crash" OR process_name="*nc*")