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

CVSS Base Score: 10/10

Impact Subscore: 10/10

Exploitability Subscore: 10/10

Exploit range: Remote

Attack complexity: Low

Authentication: No required

Confidentiality impact: Complete

Integrity impact: Complete

Availability impact: Complete

#######################################################################
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.
#######################################################################

References:

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

References:

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