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AUSCERT External Security Bulletin Redistribution
ESB-2016.1336
Environmental Systems Corporation Data Controllers Vulnerabilities
27 May 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Environmental Systems Corporation (ESC) 8832 Data Controller
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4502 CVE-2016-4501
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-147-01
Comment: Proof of concept code is publicly available.
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Advisory (ICSA-16-147-01)
Environmental Systems Corporation Data Controllers Vulnerabilities
Original release date: May 26, 2016 Share
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/.
OVERVIEW
Independent researcher Maxim Rupp has identified data controller
vulnerabilities in the Environmental Systems Corporation (ESC) 8832 Data
Controller. ESC acknowledged that Balazs Makany reported these vulnerabilities
on February 18, 2015. ESC has stated the ESC 8832 Data Controller has no
available code space to make any additional security patches; so, a firmware
update is not possible. ESC has released an advisory that identifies
compensating controls to reduce risk of exploitation of the reported
vulnerabilities.
These vulnerabilities could be exploited remotely.
Detailed vulnerability information is publicly available that could be used to
facilitate the development of an exploit that targets these vulnerabilities.
AFFECTED PRODUCTS
The following ESC 8832 Data Controller versions are affected:
ESC 8832 Version 3.02 and earlier versions.
IMPACT
Successful exploitation of these vulnerabilities may allow attackers to
perform administrative operations over the network without authentication.
Impact to individual organizations depends on many factors that are unique to
each organization. NCCIC/ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.
BACKGROUND
ESC is a US-based company that maintains offices in Austin, Texas.
The affected products, ESC 8832 Data Controller Versions 3.02 and earlier, are
web-based SCADA systems. According to ESC, the 8832 Data Controller is
deployed in the Energy Sector. ESC estimates that these products are used
primarily in the United States.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
AUTHENTICATION BYPASS [a]
The authentication process can be bypassed allowing unauthorized configuration
changes to be made to the device because of incorrect implementation of the
sessions.
CVE-2016-4501 [b] has been assigned to this vulnerability. A CVSS v3 base score
of 7.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). [c]
PRIVILEGE MANAGEMENT [d]
The device supports different accounts with distribution of system privileges.
An attacker can gain access to functions, which are not displayed in the menu
for the user by means of brute force of a parameter.
CVE-2016-4502 [e] has been assigned to this vulnerability. A CVSS v3 base score
of 7.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). [f]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
Detailed vulnerability information is publicly available that could be used to
facilitate the development of an exploit that targets these vulnerabilities.
DIFFICULTY
An attacker with a low skill would be able to exploit these vulnerabilities.
MITIGATION
ESCs recommendation for mitigation is to upgrade the device. Alternatively,
block Port 80 with a firewall in front of the device. Another alternative is
to educate operators and users to not use the web interface for device
management, because there are other means to manage the device. A security
advisory is available to ESC users on the ESC support web site (login
required):
www.envirosys.com (link is external).
ICS-CERT recommends that users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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:
http://ics-cert.us-cert.gov/content/recommended-practices. 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
(http://ics-cert.us-cert.gov/).
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.
a. CWE-287: Improper Authentication,
http://cwe.mitre.org/data/definitions/287.html, web site last accessed May 26,
2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4501, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
c. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed May 26, 2016.
d. CWE-264: Permissions, Privileges, and Access Controls,
http://cwe.mitre.org/data/definitions/264.html, web site last accessed May 26,
2016.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4502, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
f. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed May 26, 2016.
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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