ESB-2018.2282 - [Win] Delta Electronics CNCSoft and ScreenEditor: Multiple vulnerabilities 2018-08-08

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2282
          Multiple vulnerabilities have been identified in Delta
                   Electronics CNCSoft and ScreenEditor
                               8 August 2018

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

Product:           Delta Electronics CNCSoft and ScreenEditor
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Administrator Compromise -- Remote with User Interaction
                   Denial of Service        -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10636 CVE-2018-10598 

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-219-01

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Advisory (ICSA-18-219-01)

Delta Electronics CNCSoft and ScreenEditor

Original release date: August 07, 2018

Legal Notice

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/.

1. EXECUTIVE SUMMARY

CVSS v3 8.8

ATTENTION: Exploitable remotely/low skill level to exploit

Vendor: Delta Electronics

Equipment: CNCSoft and ScreenEditor

Vulnerabilities: Stack-based Buffer Overflow, Out-of-Bounds Read

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to 
gain remote code execution with administrator privileges.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

According to Delta Electronics, the following products are affected:

CNCSoft Version 1.00.83 and prior, and the accompanying,

ScreenEditor Version 1.00.54

3.2 VULNERABILITY OVERVIEW

3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121

Multiple stack-based buffer overflow vulnerabilities cause the software to 
crash due to lacking user input validation before copying data from project 
files onto the stack.

CVE-2018-10636 has been assigned to this vulnerability. A CVSS v3 base score 
of 8.8 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

3.2.2 OUT-OF-BOUNDS READ CWE-125

Two out-of-bounds read vulnerabilities cause the software to crash due to 
lacking user input validation for processing project files.

CVE-2018-10598 has been assigned to this vulnerability. A CVSS v3 base score 
of 4.3 has been assigned; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H).

3.3 BACKGROUND

CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing

COUNTRIES/AREAS DEPLOYED: Worldwide

COMPANY HEADQUARTERS LOCATION: Taiwan

3.4 RESEARCHER

Mat Powell working with Trend Micros Zero Day Initiative reported these 
vulnerabilities to NCCIC.

4. MITIGATIONS

Delta Electronics recommends the following:

Update to the latest version of CNCSoft, v1.01.09. The updated version can be
found at: 
http://www.deltaww.com/Products/PluginWebUserControl/downloadCenterCounter.aspx?DID=84&DocPath=1&hl=en-US

Restrict the interaction with the application to trusted files.

NCCIC recommends users take defensive measures to minimize the risk of 
exploitation of this vulnerability. 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 on the ICS-CERT website in the Technical Information Paper, 
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation 
Strategies.

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.

No known public exploits specifically target these vulnerabilities.

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?

The NCCIC 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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