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AUSCERT External Security Bulletin Redistribution
ESB-2016.1594
Unitronics VisiLogic OPLC IDE vlp File Parsing Stack Buffer
Overflow Vulnerability
24 June 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Unitronics VisiLogic OPLC IDE
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-4519
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-175-02
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Advisory (ICSA-16-175-02)
Unitronics VisiLogic OPLC IDE vlp File Parsing Stack Buffer Overflow
Vulnerability
Original release date: June 23, 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
ZDI has identified a buffer overflow vulnerability discovered by Steven Seeley
of Source Incite in Unitronics VisiLogic. Unitronics has produced a new
version to mitigate this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
Unitronics reports that the vulnerability affects the following versions of
VisiLogic:
Visilogic prior to Version 9.8.30
IMPACT
By exploiting this vulnerability, an attacker may be able to remotely execute
arbitrary code.
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.
BACKGROUND
Unitronics has offices in the United States and Israel.
The affected product, Unitronics VisiLogic OPLC IDE, is an HMI and PLC
application programming environment for Vision and SAMBA series controllers.
According to Unitronics, this product is used worldwide in multiple sectors.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
STACK-BASED BUFFER OVERFLOW [a]
The failure is caused by an attempt to copy into a fixed-length stack buffer
without validating its length.
CVE-2016-4519 [b] has been assigned to this vulnerability. A CVSS v3 base score
of 7.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
Unitronics recommends that users upgrade to Visilogic Version 9.8.30 or later
to mitigate this vulnerability.
The latest version can be found on the Unitronics web site at the following
location:
http://unitronicsplc.com/software-visilogic/ (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-121: Stack-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/121.html, web site last accessed June
23, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-4519, 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 June 23, 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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