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AUSCERT External Security Bulletin Redistribution
ESB-2016.1647
Eaton ELCSoft Programming Software Memory Vulnerabilities
1 July 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Eaton ELCSoft Programming Software
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4512 CVE-2016-4509
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-16-182-01
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Advisory (ICSA-16-182-01)
Eaton ELCSoft Programming Software Memory Vulnerabilities
Original release date: June 30, 2016
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
Ariele Calgaviano working with Zero Day Initiative has identified a heap-based
memory corruption vulnerability and a stack buffer overflow vulnerability in
Eatons ELCSoft programming software. Eaton has released a revision to mitigate
these vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
The following ELCSoft programming software versions are affected:
ELCSoft Version 2.4.01 and earlier.
IMPACT
An attacker may be able to exploit these vulnerabilities to execute arbitrary
code on the target system.
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
Eaton is a US-based company that maintains offices worldwide.
The affected product, ELCSoft programming software, is used to configure all
Eaton ELC programmable logic controllers deployed by power grid operators to
apply protection and communications support for overcurrent devices such as
reclosers and circuit breakers. According to Eaton, this product is used
primarily in the Energy sector. Eaton estimates this product is used
worldwide. While the ELC controllers themselves do not exhibit this
vulnerability, the PCs used to configure the logic in the ELC exhibit this
vulnerability when running the ELCSoft editor.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
HEAP-BASED BUFFER OVERFLOW [a]
A proof-of-concept file can be run after page heap is turned on for
elcsoft.exe.
CVE-2016-4509 [b] has been assigned to this vulnerability. A CVSS v3 base score
of 6.0 has been assigned; the CVSS vector string is
(AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L). [c]
STACK-BASED BUFFER OVERFLOW [d]
The ELCSimulator copies the input network packet into a fixed size stack
buffer without checking if it will fit.
CVE-2016-4512 [e] has been assigned to this vulnerability. A CVSS v3 base score
of 7.3 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). [f]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with a low skill would be able to exploit these vulnerabilities.
MITIGATION
Eaton has released a revision that mitigates these vulnerabilities. The
revision can be downloaded at:
https://eatonfilesharing.box.com/s/r4ulykfay2x5nlai9pqijivdh1zyks98 (link is
external).
Eaton states the current firmware needs to be uninstalled prior to loading the
update.
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-122: Heap-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/122.html, web site last accessed June
30, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4509, 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:H/PR:L/UI:N/S...,
web site last accessed June 30, 2016.
d. CWE-121: Stack-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/121.html, web site last accessed June
30, 2016.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4512, 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 June 30, 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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