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AUSCERT External Security Bulletin Redistribution
ESB-2020.2777
Advisory (icsa-20-224-08) Siemens SICAM A8000 RTUs
12 August 2020
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AusCERT Security Bulletin Summary
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Product: SICAM A8000
Publisher: US-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2020-15781
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-224-08
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ICS Advisory (ICSA-20-224-08)
Siemens SICAM A8000 RTUs
Original release date: August 11, 2020
Legal Notice
All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any information contained
within. DHS does not endorse any commercial product or service, referenced in
this product or otherwise. Further dissemination of this product is governed by
the Traffic Light Protocol (TLP) marking in the header. For more information
about TLP, see https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.3
o ATTENTION: Exploitable remotely
o Vendor: Siemens
o Equipment: SICAM A8000
o Vulnerability: Cross-site Scripting
2. RISK EVALUATION
Successful exploitation of this vulnerability could compromise the
confidentiality, integrity, and availability of the web application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SICAM A8000 RTUs are affected:
o SICAM WEB firmware: all versions prior to C05.30
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
The login screen does not sufficiently sanitize input, which enables an
attacker to generate specially crafted log messages. If an unsuspecting user
views the log messages via a web browser, these log messages might be
interpreted and executed as code by the web application. This cross-site
scripting (XSS) vulnerability might compromise the confidentiality, integrity,
and availability of the web application.
CVE-2020-15781 has been assigned to this vulnerability. A CVSS v3 base score of
8.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:C/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Emma Good from KTH Royal Institute of Technology reported this vulnerability to
Siemens.
4. MITIGATIONS
Siemens recommends users update to the latest version, v05.30 . Applying the
update causes the device/module to go through a single restart cycle. Siemens
also recommends users:
o Restrict access to Port 443/TCP
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to the Siemens operational guidelines for Industrial Security and
following the recommendations in the product manuals.
For additional information, please refer to Siemens Security Advisory
SSA-370042
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . Several recommended practices are available
for reading and download, including Improving Industrial Control Systems
Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability. High skill
level is needed to exploit.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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