DATAC RealWin <= 2.1 (Build 6.1.10.10) stack overflow

2011-04-06 / 2011-04-07

Credit: Luigi Auriemma

Risk: Medium

Local: No

Remote: Yes

CVE: CVE-2011-1563

CWE: CWE-119

Ogólna skala CVSS: 10/10

Znaczenie: 10/10

Łatwość wykorzystania: 10/10

Wymagany dostęp: Zdalny

Złożoność ataku: Niska

Autoryzacja: Nie wymagana

Wpływ na poufność: Pełny

Wpływ na integralność: Pełny

Wpływ na dostępność: Pełny

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

                             Luigi Auriemma

Application:  DATAC RealWin
              http://www.dataconline.com/software/realwin.php
              http://www.realflex.com
Versions:     <= 2.1 (Build 6.1.10.10)
Platforms:    Windows
Bug:          stack overflow
Exploitation: remote, versus server
Date:         21 Mar 2011 (found 25 Nov 2010)
Author:       Luigi Auriemma
              e-mail: aluigi@autistici.org
              web:    aluigi.org


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


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


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

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


"RealWin is a SCADA server package for medium / small applications."


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

======
2) Bug
======


The part of the server listening on port 910 is vulnerable to a buffer
overflow happening in the function 004be510 that splits the input
strings using some delimiters passed by the callee functions and copies
them in a stack buffer of 1024 bytes.

One of the ways to exploit the vulnerability in that function is
through an On_FC_CONNECT_FCS_LOGIN packet containing a long username.


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

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


http://aluigi.org/poc/realwin_2.zip

  nc SERVER 910 < realwin_2.dat


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

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


No fix.


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

Referencje:

http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-080-04.pdf

http://www.vupen.com/english/advisories/2011/0742

http://www.securityfocus.com/bid/46937

http://www.exploit-db.com/exploits/17025

http://secunia.com/advisories/43848

http://aluigi.org/adv/realwin_8-adv.txt

http://aluigi.org/adv/realwin_7-adv.txt

http://aluigi.org/adv/realwin_5-adv.txt

http://aluigi.org/adv/realwin_4-adv.txt

http://aluigi.org/adv/realwin_3-adv.txt

http://aluigi.org/adv/realwin_2-adv.txt

See this note in RAW Version

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DATAC RealWin <= 2.1 (Build 6.1.10.10) stack overflow

Referencje:

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