ESB-2018.1638 - [Win] Delta Industrial Automation DOPSoft: Multiple vulnerabilities 2018-06-01

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1638
       Advisory (ICSA-18-151-01) Delta Industrial Automation DOPSoft
                                1 June 2018

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

Product:           Delta Industrial Automation DOPSoft
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-10623 CVE-2018-10621 CVE-2018-10617

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-151-01

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Advisory (ICSA-18-151-01) Delta Industrial Automation DOPSoft

Original release date: May 31, 2018

Legal Notice

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1. EXECUTIVE SUMMARY

    CVSS v3 7.3
    ATTENTION: Exploitable remotely/low skill level to exploit
    Vendor: Delta Electronics
    Equipment: Delta Industrial Automation DOPSoft
    Vulnerabilities: Out-of-bounds Read, Heap-based Buffer Overflow, 
                     Stack-based Buffer Overflow

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow a remote attacker
to read sensitive information, execute arbitrary code, and/or crash the 
application.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of DOPSoft, a Human Machine Interface (HMI) editing 
software, are affected:

    DOPSoft Version 4.00.04 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1 OUT-OF-BOUNDS READ CWE-125

The application performs read operations on a memory buffer where the position
can be determined by a value read from a .dpa file. This may cause improper 
restriction of operations within the bounds of the memory buffer, allow remote
code execution, alter the intended control flow, allow reading of sensitive 
information, or cause the application to crash.

CVE-2018-10623 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.2 HEAP-BASED BUFFER OVERFLOW CWE-122

The application utilizes a fixed-length heap buffer where a value larger than
the buffer can be read from a .dpa file into the buffer, causing the buffer to
be overwritten. This may allow remote code execution or cause the application
to crash.

CVE-2018-10617 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.2.3 STACK-BASED BUFFER OVERFLOW CWE-121

The application utilizes a fixed-length stack buffer where a value larger than
the buffer can be read from a .dpa file into the buffer, causing the buffer to
be overwritten. This may allow remote code execution or cause the application
to crash.

CVE-2018-10621 has been assigned to this vulnerability. A CVSS v3 base score 
of 7.3 has been calculated; the CVSS vector string is 
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).

3.3 BACKGROUND

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

3.4 RESEARCHER

B0nd @garagehackers working with Trend Micros Zero Day Initiative reported the
vulnerabilities to NCCIC.

4. MITIGATIONS

Delta Electronics recommends affected users update to the latest version found
at:

http://www.deltaww.com/Products/PluginWebUserControl/downloadCenterCounter.aspx?DID=9063&DocPath=1&hl=en-US

Delta Electronics also recommends affected users restrict the interaction with
the application to trusted files.

NCCIC recommends that users take defensive measures to minimize the risk of 
exploitation of these vulnerabilities. Specifically, users should:

 o Minimize network exposure for all control system devices and/or systems, 
   and ensure that they are not accessible from the Internet.
 o Locate control system networks and remote devices behind firewalls, and 
   isolate them from the business network.
 o 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 to other incidents.

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

 o Do not click web links or open unsolicited attachments in email messages.
 o Refer to Recognizing and Avoiding Email Scams for more information on 
   avoiding email scams.
 o Refer to Avoiding Social Engineering and Phishing Attacks for more 
   information on social engineering attacks.

No known public exploits specifically target these vulnerabilities.

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