DATAC RealWin <= 2.1 (Build 6.1.10.10) stack overflow

2011-04-06 / 2011-04-07
Risk: Medium
Local: No
Remote: Yes
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


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