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Security Activity Bulletin

Multiple Siemens Simatic S7 Products Remote Arbitrary Code Execution Vulnerabilities

 
Threat Type:IntelliShield: Applied Mitigation Bulletin
IntelliShield ID:23380
Version:3
First Published:2011 June 13 13:47 GMT
Last Published:2014 March 05 19:38 GMT
Port: Not available
Urgency:Possible use
Credibility:Confirmed
Severity:Moderate Damage
 
 
Version Summary:ICS-CERT has released a security advisory to address the multiple Siemens Simatic S7 products remote arbitrary code execution vulnerabilities.
 

Description
 
Multiple Siemens Simatic S7 programmable logic controller products contain multiple vulnerabilities that could allow an attacker to execute arbitrary code or cause a denial of service (DoS) condition on a targeted system.

The first vulnerability is due to insufficient security restrictions imposed on user sessions by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by sniffing an existing session between a controller and the software. If successful, the attacker could conduct replay attacks on the system and possibly execute arbitrary code.

The second vulnerability is due to an unspecified error in the CPU of the affected controller. An unauthenticated, remote attacker could exploit this vulnerability by sending crafted requests to the system. The processing of the requests could cause the CPU to stop responding to user requests, resulting in a DoS condition.

Functional code that exploits this vulnerability is available as a part of the Metasploit framework.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Siemens SIMATIC S7-1200 and prior CPU running on firmware version 02.00.02 is vulnerable.

Siemens has released a security advisory at the following link: SSA-625789. Siemens has released patches at the following link: Simatic S7-1200

ICS-CERT has released a security advisory at the following link: ICS-ALERT-11-186-01

 
Alert History
 

Version 2, July 11, 2011, 12:58 PM: ICS-CERT has released a security advisory to address the multiple Siemens Simatic S7 products remote arbitrary code execution vulnerabilities.

Version 1, June 13, 2011, 8:47 AM: Siemens Simatic S7-1200 contains multiple vulnerabilities that could allow an attacker to execute arbitrary code on the targeted system or cause a denial of service condition.  Updates are available.



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Siemens CorpSIMATIC S7-200 02 .00
Siemens CorpSIMATIC S7-300 02 .00
Siemens CorpSIMATIC S7-400 V2 .00
Siemens CorpSIMATIC S7-1200 02 .00

Associated Products:
N/A




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The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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