Operating System:

[Appliance]

Published:

14 December 2016

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2016.2972
      Delta Electronics WPLSoft, ISPSoft, and PMSoft Vulnerabilities
                             14 December 2016

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           WPLSoft
                   ISPSoft
                   PMSoft
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-5805 CVE-2016-5802 

Original Bulletin: 
   http://ics-cert.us-cert.gov/advisories/ICSA-16-348-03

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Advisory (ICSA-16-348-03)

Delta Electronics WPLSoft, ISPSoft, and PMSoft Vulnerabilities

Original release date: December 13, 2016

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

Researchers axt and Ariele Caltabiano each working with Trend Micro's Zero Day
Initiative (ZDI) have identified vulnerabilities in Delta Electronics WPLSoft,
ISPSoft, and PMSoft software applications. Delta Electronics has produced new
software versions to mitigate these vulnerabilities.

AFFECTED PRODUCTS

The following Delta Electronics products and versions are affected:

WPLSoft, Versions prior to V2.42.11,

ISPSoft, Versions prior to 3.02.11, and

PMSoft, Versions prior to2.10.10

IMPACT

Successful exploitation of these vulnerabilities may allow an attacker to 
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 these vulnerabilities based on their operational environment, 
architecture, and product implementation.

BACKGROUND

Delta Electronics is a Taiwan-based company that maintains offices in several
countries around the world, including China, Japan, South Korea, Singapore, 
India, Brazil, and the US.

The affected products, WPLSoft, ISPSoft, and PMSoft, are platforms for editing
the control software of Delta DVP series motion controlling programmable logic
controllers (PLCs). According to Delta Electronics, these platforms are used 
to prepare process control systems (PCSs) for deployment across a variety of 
industrial automation environments within the Critical Manufacturing Sector. 
Delta Electronics estimates that these products are used primarily in ASIA and
Europe with a small percentage in the US.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

HEAP-BASED BUFFER OVERFLOW[a]

There are multiple instances of heap-based buffer overflows that may allow 
malicious files to cause the execution of arbitrary code or a denial of 
service.

CVE-2016-5805[b] has been assigned to these vulnerabilities. A CVSS v3 base 
score of 7.8 has been calculated; 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 WRITE[d]

Multiple instances of out-of-bounds conditions may allow malicious files to be
read and executed by the affected software.

CVE-2016-5802[e] has been assigned to this vulnerability. A CVSS v3 base score 
of 7.8 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).[f]

VULNERABILITY DETAILS

EXPLOITABILITY

These vulnerabilities are not exploitable remotely and cannot be exploited 
without user interaction. These exploits are triggered when a local user runs
the vulnerable application and loads malformed files with .dvp or other 
extensions.

EXISTENCE OF EXPLOIT

No known public exploits specifically target these vulnerabilities in these 
products.

DIFFICULTY

Crafting a working exploit for these vulnerabilities would be difficult. 
Social engineering is required to convince the user to accept the malformed 
file. Additional user interaction is needed to load the malformed file. This 
decreases the likelihood of a successful exploit.

MITIGATION

Delta Electronics recommends affected users update their software to the 
latest versions ISPSoft V3.02.11, PMSoft V2.10.10, and WPLSoft V2.42.11 that 
are available through the following links:

ISPSoft V3.02.11

http://www.deltaww.com/filecenter/Products/download/06/060301/Software/DELTA_IA-PLC_ISPSoft-V3-02-11_SW_20161115.zip

PMSoft V2.10.10

http://www.deltaww.com/filecenter/Products/download/06/060301/Software/DELTA_IA-PLC_PMSoft-V2-10-10_SW_20161115.zip

WPLSoft V2.42.11

http://www.deltaww.com/filecenter/Products/download/06/060301/Software/DELTA_IA-PLC_WPLSoft-V2-42-11_SW_20161115.zip

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 for more information on 
avoiding email scams.

Refer to Avoiding Social Engineering and Phishing Attacksfor more 
information on social engineering attacks.

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 
December 13, 2016.

b.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5805, 
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:L/AC:L/PR:N/UI:R/S..., 
web site last accessed December 13, 2016.

d.
CWE-787: Out-of-Bounds Write, 
https://cwe.mitre.org/data/definitions/787.html, web site last accessed 
December 13, 2016.

e.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5802, 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:L/AC:L/PR:N/UI:R/S..., 
web site last accessed December 13, 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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