CVE-2025-20797: MediaTek芯片电池驱动越界写入本地权限提升漏洞

/* * CVE-2025-20797 PoC - MediaTek Battery Driver Out of Bounds Write * This is a conceptual proof of concept demonstrating the vulnerability. * Actual exploitation requires system privilege and device-specific analysis. * * Note: This code is for educational and security research purposes only. * Unauthorized access to computer systems is illegal. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> // Simulated battery driver structure struct battery_driver_ctx { char buffer[256]; uint32_t size; void* next_handler; }; // Vulnerable function - missing bounds check void battery_write_vulnerable(struct battery_driver_ctx* ctx, const char* data, uint32_t len) { // VULNERABILITY: No bounds checking before write // Should check: if (ctx->size + len > sizeof(ctx->buffer)) memcpy(ctx->buffer + ctx->size, data, len); ctx->size += len; } // Safe function - with bounds checking void battery_write_safe(struct battery_driver_ctx* ctx, const char* data, uint32_t len) { // FIX: Proper bounds checking if (ctx->size + len > sizeof(ctx->buffer)) { printf("[SECURITY] Write blocked - buffer overflow prevented\n"); return; } memcpy(ctx->buffer + ctx->size, data, len); ctx->size += len; } int main(int argc, char* argv[]) { printf("CVE-2025-20797 PoC - MediaTek Battery Driver OOB Write\n"); printf("=================================================\n\n"); struct battery_driver_ctx ctx; memset(&ctx, 0, sizeof(ctx)); // Normal write operation char normal_data[] = "Battery level: 85%"; battery_write_safe(&ctx, normal_data, strlen(normal_data)); printf("[OK] Normal write succeeded. Buffer size: %u\n", ctx.size); // Attempt to trigger vulnerability (conceptual) // In real scenario, this would require kernel-level access printf("\n[!] Vulnerability requires:\n"); printf(" - System privilege access\n"); printf(" - MediaTek battery driver interaction\n"); printf(" - Device-specific exploit development\n"); printf("\n[+] Mitigation: Apply MediaTek patch ALPS10315812\n"); return 0; }