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AUSCERT External Security Bulletin Redistribution
ESB-2016.0873
Pro-face GP-Pro EX HMI Vulnerabilities
7 April 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Pro-face GP-Pro EX HMI
Publisher: ICS-CERT
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Access Privileged Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-7921 CVE-2016-2292 CVE-2016-2291
CVE-2016-2290
Original Bulletin:
http://ics-cert.us-cert.gov/advisories/ICSA-16-096-01
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Advisory (ICSA-16-096-01)
Pro-face GP-Pro EX HMI Vulnerabilities
Original release date: April 05, 2016 | Last revised: April 06, 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 (Zero Day Initiative) has identified one information disclosure and two
buffer overflow vulnerabilities, and independent researcher Jeremy Brown has
identified hard-coded credentials in Pro-faces GP-Pro EX HMI software.
Pro-face has produced a module to mitigate these vulnerabilities.
These vulnerabilities could be exploited remotely, and some can be exploited
without user interaction.
AFFECTED PRODUCTS
Pro-face reports that these vulnerabilities affect the following versions of
GP-Pro EX:
Models: EX-ED, PFXEXEDV, PFXEXEDLS, PFXEXGRPLS; and
Versions: 1.00 to Ver. 4.0.4
IMPACT
It is possible for an attacker to force a stack-based buffer overflow. An
attacker can leverage these vulnerabilities to execute arbitrary code in the
context of the process.
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
Pro-face is a US-based company that maintains offices in several countries
around the world, including Asia, India, Australia, the Americas, and Europe.
Schneider Electric has recently acquired Pro-face.
The affected product, GP-Pro EX, is an HMI Screen Editor and Logic Programing
software. According to Pro-face, GP-Pro EX is deployed across several sectors
including Commercial Facilities, Critical Manufacturing, Energy, Water and
Wastewater Systems, and others. Pro-face estimates that this product is used
worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
HEAP-BASED BUFFER OVERFLOW [a]
It is possible for an attacker to force a heap-based buffer overflow. An
attacker can leverage this vulnerability to execute arbitrary code in the
context of the process.
CVE-2016-2290 [b] has been assigned to this vulnerability. A CVSS v3 base score
of 8.8 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). [c]
OUT-OF-BOUNDS READ [d]
It is possible for an attacker to force an out-of-bounds read. An attacker can
leverage this vulnerability to execute arbitrary code in the context of the
process.
CVE-2016-2291 [e] 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:R/S:U/C:H/I:N/A:N). [f]
STACK-BASED BUFFER OVERFLOW [g]
It is possible for an attacker to force a stack-based buffer overflow. An
attacker can leverage this vulnerability to execute arbitrary code in the
context of the process.
CVE-2016-2292 [h] 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:R/S:U/C:H/I:N/A:N). [i]
USE OF HARD-CODED CREDENTIALS [j]
Hard-coded credentials in the FTP server allow for a remote user to have
access to the project on the device.
CVE-2016-7921 [k] has been assigned to this vulnerability. A CVSS v3 base score
of 9.1 have been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N). [l]
AUTHENTICATION BYPASS ISSUES [m]
Authentication bypass issues in the FTP server allow for a remote user to have
access to the project on the device.
CVE-2016-7921 [n] has been assigned to this vulnerability. A CVSS v3 base score
of 9.1 have been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N). [o]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely, and some can be exploited
without user interaction.
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
Pro-face has released the following module:
GP-Pro EX (Ver. 4.05.000 or later). The Update Module includes:
Editor: Ver.4.05.000,
Transfer Tool: Ver.4.05.000, and
System/Runtime: Ver.4.5.0
To download the module, free member registration for Otasuke Pro! is required
at:
http://www.hmisource.com/otasuke/download/update/proex/ (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.
In addition, ICS-CERT recommends that users take the following measures to
protect themselves from social engineering attacks:
Do not click web links or open unsolicited attachments in email messages.
Refer to Recognizing and Avoiding Email Scams [p] for more information on
avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks [q] for more
information on social engineering attacks.
a. CWE-122: Heap-based Buffer Overflow,
http://cwe.mitre.org/data/definitions/122.html, web site last accessed April
5, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2290, 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:R/S...,
web site last accessed April 5, 2016.
d. CWE-125:Out-of-bounds Read, http://cwe.mitre.org/data/definitions/125.html,
web site last accessed April 5, 2016.
e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2291, 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:R/S...,
web site last accessed April 5, 2016.
g. CWE-121:Stack Buffer Overflow,
http://cwe.mitre.org/data/definitions/121.html, web site last accessed April
5, 2016.
h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2292, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
i. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S...,
web site last accessed April 5, 2016.
j. CWE-798:Use of Hard-coded Credentials,
http://cwe.mitre.org/data/definitions/798.html, web site last accessed April
5, 2016.
k. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7921, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
l. 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 April 5, 2016.
m. CWE-592:Authentication Bypass Issues,
http://cwe.mitre.org/data/definitions/592.html, web site last accessed April
5, 2016.
n. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-7921, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
o. 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 April 5, 2016.
p. Recognizing and Avoiding Email Scams,
http://www.us-cert.gov/reading_room/emailscams_0905.pdf, web site last
accessed April 5, 2016.
q. National Cyber Alert System Cyber Security Tip ST04-014,
http://www.us-cert.gov/cas/tips/ST04-014.html, web site last accessed April 5,
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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