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AUSCERT External Security Bulletin Redistribution
23 June 2017
AusCERT Security Bulletin Summary
Product: Siemens XHQ
Operating System: Windows
Impact/Access: Access Confidential Data -- Existing Account
CVE Names: CVE-2017-6866
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Original release date: June 22, 2017
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CVSS v3 6.5
ATTENTION: Remotely exploitable/low skill level to exploit.
Vulnerability: Improper Access Control
Siemens reports that the vulnerability affects the following versions of
the XHQ operations intelligence product line:
XHQ 4: All versions prior to V184.108.40.206
XHQ 5: All versions prior to V220.127.116.11
This vulnerability could allow a low-privileged remote user to gain read
access to data in the XHQ solution exceeding his configured permission level.
Siemens has released new versions of XHQ to address this vulnerability.
Users are to call their local service organization for further information on
how to obtain the newest version of XHQ. If the local service organization
is not known, please call a local Siemens hotline center:
Siemens strongly recommends users protect network access to XHQ with
appropriate mechanisms. Siemens also advises that users configure the
operational environment according to Siemens' Operational Guidelines
for Industrial Security:
For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-945660 at the
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:
Restrict access to systems to only those users who require access
Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
Locate control system networks and remote devices behind firewalls,
and isolate them from the business network.
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.
ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
ICS-CERT 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 in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability. This
vulnerability is remotely exploitable. Low skill level is needed to exploit.
IMPROPER ACCESS CONTROL CWE-284
A vulnerability in XHQ server could allow an authenticated, low-privileged
remote user to gain read access to data in the XHQ solution exceeding his
configured permission level.
CVE-2017-6866 has been assigned to this vulnerability. A CVSS v3
base score of 6.5 has been calculated; the CVSS vector string is
Siemens self-reported this vulnerability.
Critical Infrastructure Sector: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
For any questions related to this report, please contact ICS-CERT at:
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You
can help by choosing one of the links below to provide feedback about
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