Operating System:

[Win]

Published:

07 April 2016

Protect yourself against future threats.

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.0873
                  Pro-face GP-Pro EX HMI Vulnerabilities
                               7 April 2016

===========================================================================

        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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