Rockwell RSLogix Denial of Service

2011.09.20
Risk: Medium
Local: No
Remote: Yes
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: Rockwell RSLogix http://www.rockwellautomation.com/rockwellsoftware/design/rslogix5000/ Versions: <= 19 (RsvcHost.exe 2.30.0.23) 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: "With RSLogix 5000 programming software, you need only one software package for discrete, process, batch, motion, safety and drive-based application." ####################################################################### ====== 2) Bug ====== RsvcHost.exe and RNADiagReceiver.exe listen on ports 4446 and others. These services use RnaUtility.dll which doesn't handle the 32bit size field located in the "rna" packets with results like a memset zero overflow and invalid read access. ####################################################################### =========== 3) The Code =========== http://aluigi.org/poc/rslogix_1.zip nc SERVER 4446 < rslogix_1a.dat nc SERVER 4446 < rslogix_1b.dat ####################################################################### ====== 4) Fix ====== No fix. #######################################################################

References:

http://aluigi.altervista.org/adv/rslogix_1-adv.txt


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