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AUSCERT External Security Bulletin Redistribution
ESB-2019.2097
Advisory (ICSA-19-162-03) Siemens LOGO!8 Devices
12 June 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens LOGO!8 Devices
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6584 CVE-2019-6571
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-19-162-03
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Advisory (ICSA-19-162-03)
Siemens LOGO!8 Devices
Original release date: June 11, 2019
Legal Notice
All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: LOGO!8 devices
o Vulnerabilities: Improper Restriction of Operations within the Bounds of a
Memory Buffer, Session Fixation
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
read the communication between the affected device and a user, and compromise
the availability of the targeted system.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of LOGO!8 devices, that are used for basic small-scale
automation tasks, are affected:
o SIEMENS LOGO!8: 6ED1052-xyyxx-0BA8 FS:01 to FS:06 / Firmware v1.80.xx and
v1.81.xx
o SIEMENS LOGO!8: 6ED1052-xyy08-0BA0 FS:01 / Firmware version prior to
v1.82.02
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119
An attacker with network access to Port 10005/TCP of the LOGO!8 device could
cause a denial-of-service condition by sending specially crafted packets. This
security vulnerability could be exploited by an unauthenticated attacker with
network access to the affected service. No user interaction is required, and
successful exploitation could compromise the availability of the targeted
system.
CVE-2019-6571 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).
3.2.2 SESSION FIXATION CWE-384
The integrated webserver does not invalidate the Session ID upon user logout.
An attacker who successfully extracted a valid Session ID is able to use it
even after the user logs out. This security vulnerability could be exploited by
an attacker in a privileged network position who is able to read the
communication between the affected device and the user, or by an attacker who
is able to obtain valid Session IDs through other means. To facilitate this
exploit, the user must first invoke a session to the affected device.
CVE-2019-6584 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/C:H/
I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Transportation
Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Thomas Meesters from cirosec GmbH and Ruhr University of Bochum, and Christian
Siemers and Irakli Edjibia from Hochschule Augsburg reported these
vulnerabilities to Siemens.
4. MITIGATIONS
For Siemens LOGO!8: 6ED1052-xyyxx-0BA8 FS:01 to FS:06 / Firmware version
v1.80.xx and v1.81.xx: Siemens recommends upgrading to a new version.
Siemens has updates at https://support.industry.siemens.com/cs/ww/en/view/
109767410 for the following product:
o Siemens LOGO!8: 6ED1052-xyy08-0BA0 FS:01 / Firmware version prior to
v1.82.02: Update to vV1.82.02 or higher.
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Protect network access to the device.
o As a general security measure Siemens strongly recommends protecting
network access to the devices with appropriate mechanisms.
o In order to operate the devices in a protected IT environment, Siemens
recommends configuring the environment according to Siemens' operational
guidelines for Industrial Security ( https://cert-portal.siemens.com/
operational-guidelines-industrial-security.pdf ), and following the
recommendations in the product manuals.
Additional information on Industrial Security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
For more information on these vulnerabilities and more detailed mitigation
instructions, please see Siemens security advisory SSA-774850 at the following
location: http://www.siemens.com/cert/advisories
NCCIC recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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.
NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking
and correlation against other incidents.
NCCIC also recommends that users take the following measures to protect
themselves from social engineering attacks:
o Do not click web links or open unsolicited attachments in email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target these vulnerabilities. High skill
level is needed to exploit.
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