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TLP:WHITE

Advisory (ICSA-16-348-03)

Delta Electronics WPLSoft, ISPSoft, and PMSoft Vulnerabilities

Original release date: December 13, 2016

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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 OVERFLOWa

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-2016-5805b 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 WRITEd

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

CVE-2016-5802e 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:

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 ICS‑CERT 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.


Contact Information

For any questions related to this report, please contact the NCCIC at:

Email: NCCICCUSTOMERSERVICE@hq.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  http://ics-cert.us-cert.gov 
or incident reporting:  https://ics-cert.us-cert.gov/Report-Incident?

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