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AUSCERT External Security Bulletin Redistribution
Endress+Hauser Fieldcare/CodeWrights HART Comm DTM XML
28 September 2015
AusCERT Security Bulletin Summary
Product: Endress+Hauser Fieldcare/CodeWrights HART Comm DTM
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
CVE Names: CVE-2015-6463
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Endress+Hauser Fieldcare/CodeWrights HART Comm DTM XML Injection
Original release date: September 24, 2015
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Alexander Bolshev of Digital Security has identified a vulnerability
within Endress+Hauser HART DTM software libraries. The vulnerability is in
handling of the HART longtag response field in Endress+Hauser's Fieldcare
and CodeWrights HART Comm DTM.
Endress+Hauser Process Solutions AG and CodeWrights have produced
new versions of the software that in combination mitigates the
vulnerability. Alexander Bolshev has tested the updated versions to validate
that it resolves the vulnerability.
This vulnerability could be exploited from an adjacent network receiving
HART DTM packets.
All HART DTM components relying on Fieldcare and a CodeWrights HART Comm
DTM are impacted. Individual components are not listed within this advisory
because of the extreme number of potentially impacted devices.
When a Device DTM component receives a HART packet response to Command
20 (longtag), it extracts the longtag from the packet. The string is
capable of storing an XML schema. The HART Comm DTM reads the XML schema
and attempts to retrieve XML schema or the document from the location
stored in the longtag. This leads to potential Server Side Request Forgery
(SSRF) attacks or XML External Entity attacks. This attack may cause the
disclosure of confidential data, denial of service, port scanning, and
other possible system impacts from the perspective of the machine where
the parser is located.
In an SSRF, the network connection will originate from the application
server internal IP, and an attacker will be able to use this connection to
bypass network controls. This could allow exposure of internal resources
that are not otherwise visible.
Impact to individual organizations depends on many factors that are unique
to each organization. NCCIC/ICS-CERT recommends that organizations evaluate
the impact of this vulnerability based on their operational environment,
architecture, and product implementation.
Endress+Hauser is an international company based in Germany and Switzerland,
with over 200 offices and production centers located worldwide.
CodeWrights GmbH is a German-based company that provides device integration
and management solutions. CodeWrights GmbH supplies components that are
used in DTMs of other vendors.
The Endress+Hauser Fieldcare manages the FDT/DTM Frame Application. The HART
Comm DTM is part of the FDT/DTM architecture used to provide communication
protocol information to the Frame Application. ICS-CERT has concluded these
devices are deployed across several sectors including Chemical, Commercial
Facilities, Critical Manufacturing, Energy, Food and Agriculture, Water
and Wastewater Systems, and others. ICS-CERT estimates that these DTMs
are used in products worldwide.
XML CODE INJECTION[a]
XML schema is injected into the accepted response packet. When Comm DTM
reads longtag values from the Device DTM it attempts to parse the XML
schema potentially allowing for remote access and control.
CVE-2015-6463[b] has been assigned to this vulnerability. A
CVSS v3 base score of 8.3 and temporal score of 7.5 has been
assigned for each vulnerability; the CVSS vector string is
This vulnerability could be exploited from an adjacent network receiving
HART DTM packets.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
Endress+Hauser and CodeWrights have provided their own security advisories
and patches which can be found at:
Asset owners using FieldCare or CodeWright HART Comm DTMs should update
their software to the newest version as soon as possible.
Some processes may require continual configuration changes. ICS-CERT
recommends asset owners maintain all software with the latest security
releases, limit connections outside the control system, and monitor approved
connections for suspicious traffic. ICS-CERT also recommends that asset
owners employ a least privilege practice and avoid unnecessary services
within their production environment.
ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of this vulnerability. Specifically, users should:
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 at:
recommended practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
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.
CWE-91: XML Injection (aka Blind XPath Injection),
http://cwe.mitre.org/data/definitions/91.html, web site last accessed
September 24, 2015.
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
web site last accessed September 24, 2015.
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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