Delta Electronics PMSoft CVE-2018-8839 Multiple Stack Based Buffer Overflow

Authors:Ghirmay Desta-Trend Micro   Risk:High

CVE:CVE-2018-8839                  0day:Stack Based Buffer Overflow

0day -id:0DAY-176118                Date:2018-04-29

Description

The application has multiple stack-based buffer overflow vulnerabilities where a .ppm file can introduce a value larger than is readable by PMSoft’s fixed-length stack buffer. This can cause the buffer to be overwritten, which may allow arbitrary code execution or cause the application to crash.

RISK EVALUATION

Successful exploitation of these vulnerabilities could cause the application to crash; stack-based buffer overflow conditions may allow arbitrary code execution.

SUMMARY

  • CVSS v3 7.1
  • ATTENTION: Low skill level to exploit.
  • Vendor: Delta Electronics
  • Equipment: PMSoft
  • Vulnerabilities: Multiple Stack-Based Buffer Overflow vulnerabilities

BACKGROUND

  • Critical Infrastructure Sectors: Critical Manufacturing
  • Countries/Areas Deployed: Worldwide
  • Company Headquarters Location: Taiwan

ESEARCHER

Ghirmay Desta, working with Trend Micro’s Zero Day Initiative, reported these vulnerabilities to NCCIC.

ITIGATIONS

Delta Electronics recommends affected users update to at least PMSoft v2.11, which was made available as of March 22, 2018, or the latest available version. This update can be found for download at the following location:

http://www.deltaww.com/Products/PluginWebUserControl/downloadCenterCounter.aspx?DID=2092&DocPath=1&hl=en-US

NCCIC 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.

NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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 website.

Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.

NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:

No known public exploits specifically target these vulnerabilities. These vulnerabilities are not exploitable remotely.

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