CVE-2025-55174: KDE Skanpage文件覆盖漏洞

#!/usr/bin/env python3 """ CVE-2025-55174 PoC - KDE Skanpage File Overwrite Vulnerability This PoC demonstrates the file content corruption issue when saving files. """ import os import sys from PyQt5.QtCore import QFile, QIODevice def demonstrate_vulnerability(): """ Demonstrates the vulnerable file writing behavior. Original file content is preserved when it should be replaced. """ # Create a test file with original content original_content = "Original file content that should be completely replaced." test_file = "test_document.txt" with open(test_file, 'w') as f: f.write(original_content) # Simulate vulnerable behavior (QIODevice::ReadWrite) # This is what KDE Skanpage was doing incorrectly file = QFile(test_file) if file.open(QIODevice.ReadWrite): # VULNERABLE: Should be WriteOnly new_content = "New content." file.write(new_content.encode()) # File is now: "New content.tent that should be completely replaced." # Old content is partially preserved! file.close() # Read and display the corrupted content with open(test_file, 'r') as f: corrupted_content = f.read() print(f"Original content: {original_content}") print(f"New content: {new_content}") print(f"Actual file content: {corrupted_content}") print(f"\nVulnerability confirmed: Old content leaked after new content!") # Cleanup os.remove(test_file) def demonstrate_fix(): """ Demonstrates the correct fix using WriteOnly mode. """ test_file = "test_document_fixed.txt" original_content = "Original content that will be replaced." with open(test_file, 'w') as f: f.write(original_content) # Correct behavior (QODevice::WriteOnly) file = QFile(test_file) if file.open(QIODevice.WriteOnly): # FIXED: WriteOnly mode new_content = "New content." file.write(new_content.encode()) file.close() with open(test_file, 'r') as f: correct_content = f.read() print(f"Correct file content: {correct_content}") print(f"Content matches expected: {correct_content == new_content}") os.remove(test_file) if __name__ == "__main__": print("=" * 60) print("CVE-2025-55174 - KDE Skanpage File Overwrite Vulnerability PoC") print("=" * 60) demonstrate_vulnerability() print("\n" + "-" * 60 + "\n") demonstrate_fix()