CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
93.6%
A researcher working with Trend Micro’s Zero Day Initiative (ZDI) has identified a stack-based buffer overflow vulnerability in FATEK Automation’s PLC WinProladder application. Fatek Automation (Fatek) has not produced an update to mitigate this vulnerability. ZDI has coordinated with NCCIC/ICS-CERT. ZDI will publish the PLC WinProladder vulnerability.
This vulnerability could be exploited remotely.
The following PLC WinProladder version is affected:
Successful exploitation of the reported vulnerability may allow an attacker to perform a number of malicious actions including arbitrary code execution.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
FATEK Automation is a Taiwan-based company that maintains distribution offices in several countries around the world.
The affected product, PLC WinProladder, is a PLC programming software. According to Fatek, this product is deployed across several sectors including Commercial Facilities and Critical Manufacturing. Fatek estimates that this product is used primarily in Europe and Asia.
A stack-based buffer overflow vulnerability exists when the software application connects to a malicious server, resulting in a stack buffer overflow. This causes an exploitable Structured Exception Handler (SEH) overwrite condition that may allow remote code execution.
CVE-2016-8377NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-8377, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. A CVSS v3 base score of 8.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H).CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H, web site last accessed December 15, 2016.
This vulnerability could be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with a low skill would be able to exploit this vulnerability.
FATEK Automation has not responded to requests to work with ICS-CERT to mitigate this vulnerability.
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
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. 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.
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.
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:S/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
93.6%