CVE-2025-14936
📋 TL;DR
This is a stack-based buffer overflow vulnerability in NSF Unidata NetCDF-C library that allows remote code execution when processing malicious NetCDF files. Attackers can exploit it by tricking users into opening specially crafted files or visiting malicious web pages. Affects applications using vulnerable NetCDF-C library versions.
💻 Affected Systems
- NSF Unidata NetCDF-C library
📦 What is this software?
Netcdf by Unidata
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker executing arbitrary code with the privileges of the user running the vulnerable 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 processes 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 attribute name parsing, which is a common operation when reading NetCDF files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Unidata advisory for specific patched version
Vendor Advisory: https://www.unidata.ucar.edu/software/netcdf/
Restart Required: Yes
Instructions:
1. Check current NetCDF-C version
2. Visit Unidata NetCDF security advisory page
3. Download and install the patched version
4. Recompile any applications using NetCDF-C
5. Restart affected services
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation for NetCDF files before processing
# Example: Validate file signatures before processing
file --mime-type input.nc | grep -q 'application/x-netcdf'
Memory Protection
linuxEnable ASLR and DEP/Stack Protection on systems
# Linux: Check ASLR status
cat /proc/sys/kernel/randomize_va_space
# Should be 1 or 2
🧯 If You Can't Patch
- Implement strict network filtering to block untrusted NetCDF file sources
- Run vulnerable applications with minimal privileges using sandboxing or containerization
🔍 How to Verify
Check if Vulnerable:
Check NetCDF-C library version and compare against patched versions in Unidata advisoryCheck Version:
nc-config --version # or check library version in applicationVerify Fix Applied:
Verify installed NetCDF-C version matches or exceeds patched version, test with known safe NetCDF files📡 Detection & Monitoring
Log Indicators:
- Application crashes when processing NetCDF files
- Unusual memory access patterns in application logs
- Failed file parsing attempts
Network Indicators:
- Unexpected downloads of NetCDF files from untrusted sources
- Network traffic patterns suggesting file transfer followed by application crash
SIEM Query:
source="application.log" AND ("segmentation fault" OR "buffer overflow" OR "NetCDF")