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AUSCERT External Security Bulletin Redistribution
ESB-2018.2387
Advisory (ICSA-18-226-03) Siemens Automation License Manager
16 August 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Automation License Manager
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-11456 CVE-2018-11455
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-18-226-03
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Advisory (ICSA-18-226-03)
Siemens Automation License Manager
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 8.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: Automation License Manager
o Vulnerabilities: Relative Path Traversal, Improper Input Validation
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow remote code
execution or allow an attacker to determine port status on another remote
system.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
According to Siemens, the following products are affected:
o Automation License Manager 5: All versions prior to 5.3.4.4, and
o Automation License Manager 6: All versions prior to 6.0.1 (only affected
by CVE-2018-11455).
3.2 VULNERABILITY OVERVIEW
3.2.1 RELATIVE PATH TRAVERSAL CWE-23
A directory traversal vulnerability could allow a remote attacker to move
arbitrary files, which can result in code execution, compromising system
confidentiality, integrity, and availability. Successful exploitation requires
a network connection to the affected device. The attacker does not need
privileges or special conditions, but user interaction is required.
CVE-2018-11455 has been assigned to this vulnerability. A CVSS v3 base score
of 8.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U
/C:H/I:H/A:H).
3.2.2 IMPROPER INPUT VALIDATION CWE-20
An attacker with network access to the device could send specially crafted
network packets to determine whether a network port on another remote system
is accessible. This allows the attacker to do basic network scanning using the
victim's machine.
Successful exploitation requires a network connection. The attacker does not
need privileges, and no user interaction is required. The impact is limited to
determining whether or not a port on a target system is accessible by the
affected device.
CVE-2018-11456 has been assigned to this vulnerability. A CVSS v3 base score
of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U
/C:L/I:N/A:N).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture,
and Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Vladimir Dashchenko from Kaspersky Lab worked with Siemens to identify the
vulnerabilities, and Siemens reported the vulnerabilities to NCCIC.
4. MITIGATIONS
Siemens has recommended the following mitigations:
o Automation License Manager 5: Update to v5.3.4.4, and
o Automation License Manager 6: Update to v6.0.1
https://support.industry.siemens.com/cs/ww/en/view/114358
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 Siemens' operational guidelines for Industrial Security
(Download: https://www.siemens.com/cert/
operational-guidelines-industrial-security) 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 associated software updates,
please see Siemens security advisory SSA-920962 on their website:
https://www.siemens.com/cert/advisories
NCCIC 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.
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.
No known public exploits specifically target these vulnerabilities.
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