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                             Luigi Auriemma

Application:  MG-SOFT Net Inspector
              http://www.mg-soft.com/netinsp.html
              (bug C affects any MgWTrap3 service which is included in
              almost all the MG-SOFT products like MIB Browser, Query
              Manager, Trap Ringer Pro and so on)
Versions:     Net Inspector <= 6.5.0.828
Platforms:    Windows and Linux
Bugs:         A] format string in mghttpd
              B] directory traversal in mghttpd
              C] crash in MgWTrap3
              D] Denial of Service in niengine
Exploitation: remote
Date:         14 Mar 2008
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org


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1) Introduction
2) Bugs
3) The Code
4) Fix


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===============
1) Introduction
===============


From vendor's website:
"MG-SOFT Net Inspector is a powerful fault management application with
alarming subsystem that complies with the international alarm reporting
recommendations (ITU X.733). The software lets you effectively monitor
the status of network devices and manage alarms associated with devices
in the supervised TCP/IP network."


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=======
2) Bugs
=======

---------------------------
A] format string in mghttpd
---------------------------

mghttpd is a simple HTTP daemon running on port 5228 used to allow the
clients to download the Net Inspector Java Client.
This server is affected by a format string vulnerability located in the
function which logs the clients requests in the log file.


---------------------------------
B] directory traversal in mghttpd
---------------------------------

This service is also affected by a classical directory traversal
vulnerability using both the slash and backslash plain delimiters which
can be exploited to download files from the disk on which is located
the server.


--------------------
C] crash in MgWTrap3
--------------------

The SNMP Trap Service other than binding the local TCP port 8888 and
the UDP 162 for collecting SNMP queries, binds also an additional UDP
port which changes each time the service is executed (uses the first
free available port).
Sending a packet (empty or with any desired content since it's not
important) directly to this port raises an exception which terminates
the service immediately.
This service is the core of almost all the MG-SOFT products which so
result all vulnerable.


--------------------------------
D] Denial of Service in niengine
--------------------------------

The Net Inspector Fault Management server (niengine) can be easily
freezed with CPU at 100% and full memory consumption through a
malformed or incomplete packet.


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===========
3) The Code
===========


A]
GET /%n%n%s%s%n%n%n%s HTTP/1.0

B]
GET ../../../../boot.ini HTTP/1.0
GET \../..\../..\windows/win.ini HTTP/1.0

C]
echo|nc SERVER PORT -v -v -u

D]
echo -n -e \x2a\x45\x67\xf2\x00\x00\x00\x00|nc SERVER 5221 -v -v -w 1


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======
4) Fix
======


UPDATE 15 May 2008
New versions of the affected softwares have been released the April 7th
2008 and should fix all the bugs


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