[Control Systems] Siemens Security Updates

Number: AV17-131
Date: September 5, 2017

Purpose

The purpose of this advisory is to bring attention to Siemens security updates for products using the Discovery Service of the OPC UA protocol stack by the OPC foundation.

Assessment

Siemens released security updates for the Discovery Service of the OPC UA protocol stack to address an Improper Restriction of XML External Entity Reference. A low skilled remote user could potentially exploit this vulnerability by sending specially crafted packets to the OPC Discovery Server at Port 4840/TCP and access various resources.

Affected products:

• SIMATIC PCS 7 - V7.1 and earlier versions, V8.0: All versions, V8.1: All versions.
• SIMATIC WinCC - V7.0: All versions, V7.2: All versions, V7.3: All versions, V7.4: All versions prior to V7.4   SP1.
• SIMATIC WinCC Runtime Professional - V13: All versions, V14: All versions prior to V14 SP1.
• SIMATIC NET PC Software: All versions.
• SIMATIC IT Production Suite: All versions.

CVE Reference: CVE-2017-12069

Suggested Action

CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly. For more information, please refer to the ICS-CERT references.

References:

SIEMENS Security Advisory SSA-535640:
https://www.siemens.com/cert/pool/cert/siemens_security_advisory_ssa-535640.pdf

ICS-CERT Advisory (ICSA-17-243-01):
https://ics-cert.us-cert.gov/advisories/ICSA-17-243-01   

Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.
http://www.publicsafety.gc.ca/cnt/ntnl-scrt/cbr-scrt/_fl/CCIRCPublicPGPKey.txt

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589
E-mail: ps.communications-communications.sp@canada.ca

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