ESB-2017.2189.2 - UPDATE [Appliance] Automated Logic Corporation WebCTRL, i-VU, SiteScan: Execute arbitrary code/commands - Remote/unauthenticated 2017-09-01

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2017.2189.2
         Advisory (ICSA-17-150-01) Automated Logic Corporation ALC
                  WebCTRL, Liebert SiteScan, Carrier i-VU
                             1 September 2017

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           ALC WebCTRL
                   Liebert SiteScan
                   Carrier i-VU
Publisher:         ICS-CERT
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
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5795  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-150-01

Revision History:  September 1 2017: Product tag update
                   September 1 2017: Initial Release

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Advisory (ICSA-17-150-01)

Automated Logic Corporation ALC WebCTRL, Liebert SiteScan, Carrier i-VU

Original release date: August 31, 2017

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/.

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)

REPOSTED INFORMATION

This advisory was originally posted to the NCCIC Portal on May 30, 2017, and 
is being released to the NCCIC/ICS-CERT web site.

AFFECTED PRODUCTS

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.

IMPACT

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 
guidelines.

MITIGATION

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 
800-277-9852:

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.

VULNERABILITY OVERVIEW

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 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L).

RESEARCHER

Evgeny Ermakov from Kaspersky Lab has identified the vulnerability.

BACKGROUND

Critical Infrastructure Sector: Commercial Facilities

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Kennesaw, Georgia

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 
http://ics-cert.us-cert.gov

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 
product.

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