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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-150-01) Automated Logic Corporation ALC
WebCTRL, Liebert SiteScan, Carrier i-VU
1 September 2017
AusCERT Security Bulletin Summary
Product: ALC WebCTRL
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Provide Misleading Information -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
CVE Names: CVE-2016-5795
Revision History: September 1 2017: Product tag update
September 1 2017: Initial Release
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Automated Logic Corporation ALC WebCTRL, Liebert SiteScan, Carrier i-VU
Original release date: August 31, 2017
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/.
CVSS v3 6.5
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Automated Logic Corporation (ALC)
Equipment: ALC WebCTRL, Liebert SiteScan, Carrier i-VU
Vulnerability: XML External Entity (XXE)
This advisory was originally posted to the NCCIC Portal on May 30, 2017, and
is being released to the NCCIC/ICS-CERT web site.
The following ALC web-based building automation applications are affected:
Liebert SiteScan Web Version 6.5, and prior;
ALC WebCTRL Version 6.5, and prior; and
Carrier i-Vu Version 6.5, and prior.
The vulnerability, if exploited, could lead to the disclosure of confidential
data, denial of service (DoS), spoofing of a request from an upstream device,
port scanning from the perspective of the machine where the parser is located,
and other system impacts.
Impact to individual organizations depends on many factors that are unique to
each organization, including but not limited to whether the application was
installed and is maintained in accordance with manufacturers recommendations.
Risk of impact is significantly lower for those systems installed and
maintained as set forth in ALCs system installation and maintenance
ALC applications should always be installed and maintained in accordance with
the guidelines found here:
http://www.automatedlogic.com/Pages/Security.aspx (link is external).
In addition, ALC has released the following patches:
WebCTRL 6.0, Cumulative Patch #11;
WebCTRL 6.1, Cumulative Patch #4; and
WebCTRL 6.5, Cumulative Patch #5.
These patch releases may be obtained on the Automated Logic accounts web site
or calling Technical Support at 770-429-3002:
i-Vu 6.0, Cumulative Patch #11; and
i-Vu 6.5, Cumulative Patch #5.
These patch releases may be obtained by calling Technical Support at
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. 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 ICSCERT 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.
IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE ('XXE') CWE-611
An attacker could enter malicious input to WebCTRL, i-Vu, or SiteScan Web
through a weakly configured XML parser causing the application to execute
arbitrary code or disclose file contents from a server or connected network.
CVE-2016-5795 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been assigned; the CVSS vector string is
Evgeny Ermakov from Kaspersky Lab has identified the vulnerability.
Critical Infrastructure Sector: Commercial Facilities
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Kennesaw, Georgia
For any questions related to this report, please contact ICS-CERT at:
Email: email@example.com (link sends e-mail)
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 this
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