# ICS Advisory (ICSA-20-077-01)
## Delta Electronics Industrial Automation CNCSoft ScreenEditor
Original release date: March 17, 2020
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### Legal Notice
All information products included in [https://us-cert.gov/ics](/ics) are
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Security (DHS) does not provide any warranties of any kind regarding any
information contained within. DHS does not endorse any commercial product or
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cert.gov/tlp/](/tlp/).
* * *
## 1\. EXECUTIVE SUMMARY
* **CVSS v3 7.8**
* **ATTENTION:** Low skill level to exploit
* **Vendor:** Delta Electronics
* **Equipment:** Delta Industrial Automation CNCSoft ScreenEditor
* **Vulnerabilities:** Stack-based Buffer Overflow, Out-of-bounds Read
## 2\. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause buffer overflow
conditions that may allow information disclosure, remote code execution, or
crash the application.
## 3\. TECHNICAL DETAILS
### 3.1 AFFECTED PRODUCTS
The following versions of CNCSoft ScreenEditor, a user interface, are
affected:
* CNCSoft ScreenEditor v1.00.96 and prior
### 3.2 VULNERABILITY OVERVIEW
#### 3.2.1 [STACK-BASED BUFFER OVERFLOW
CWE-121](https://cwe.mitre.org/data/definitions/121.html)
Multiple stack-based buffer overflows can be exploited when a valid user opens
a specially crafted, malicious input file.
[CVE-2020-7002](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-7002)
has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been
calculated; the CVSS vector string is
([AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)).
#### 3.2.2 [OUT-OF-BOUNDS READ
CWE-125](https://cwe.mitre.org/data/definitions/125.html)
An out-of-bounds read overflow can be exploited when a valid user opens a
specially crafted, malicious input file due to the lack of validation.
[CVE-2020-6976](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-6976)
has been assigned to this vulnerability. A CVSS v3 base score of 3.3 has been
calculated; the CVSS vector string is
([AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)).
### 3.3 BACKGROUND
* **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing
* **COUNTRIES/AREAS DEPLOYED:** Worldwide
* **COMPANY HEADQUARTERS LOCATION:** Taiwan
### 3.4 RESEARCHER
Natnael Samson (@NattiSamson) and kimiya, working with Trend Micro's Zero Day
Initiative, reported these vulnerabilities to CISA.
## 4\. MITIGATIONS
Delta recommends the following:
* Update to the latest version of [CNCSoft v1.01.24](http://www.deltaww.com/services/DownloadCenter2.aspx?secID=8&pid=3&tid=0&CID=06&itemID=060202&typeID=1&downloadID=&title=&dataType=8;&check=1&hl=en-US) (with ScreenEditor v1.00.98).
* Restrict the interaction with the application to trusted files.
CISA recommends 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](https://www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf) for more information on avoiding email scams.
* Refer to [Avoiding Social Engineering and Phishing Attacks](https://www.us-cert.gov/ncas/tips/ST04-014) for more information on social engineering attacks.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for [control systems security recommended
practices](https://www.us-cert.gov/ics/recommended-practices) on the ICS
webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended
practices are available for reading and download, including [Improving
Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies](https://www.us-
cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-
CERT_Defense_in_Depth_2016_S508C.pdf).
Additional mitigation guidance and recommended practices are publicly
available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in
the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion
Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS-
TIP-12-146-01B).
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. These
vulnerabilities are not exploitable remotely.
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