ESB-2017.1993 - [Win] Solar Controls Heating Control Downloader (HCDownloader): Execute arbitrary code/commands - Existing account 2017-08-11

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2017.1993
         Solar Controls Heating Control Downloader (HCDownloader)
                              11 August 2017

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

Product:           Solar Controls Heating Control Downloader (HCDownloader)
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2017-9646  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-222-02

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Advisory (ICSA-17-222-02)

Solar Controls Heating Control Downloader (HCDownloader)

Original release date: August 10, 2017

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/.

CVSS v3 7.8

ATTENTION: Low skill level to exploit.

Vendor: Solar Controls

Equipment: Heating Control Downloader (HCDownloader)

Vulnerability: Uncontrolled Search Path Element

AFFECTED PRODUCTS

The following versions of Solar Controls’ Heating Control Downloader
(HCDownloader) are affected:

    HCDownloader, Version 1.0.1.15 and prior.

IMPACT

Successful exploitation of this vulnerability may allow arbitrary code
execution.

MITIGATION

Solar Controls has not responded to requests to coordinate with
NCCIC/ICS-CERT.

ICS-CERT recommends that 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.

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.

In addition, ICS-CERT recommends that 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 for more information on
    avoiding email scams.
    Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target this vulnerability. This
vulnerability is not remotely exploitable.

VULNERABILITY OVERVIEW

UNCONTROLLED SEARCH PATH ELEMENT CWE-427

An uncontrolled search path element has been identified, which could allow
an attacker to execute arbitrary code on a target system using a malicious
DLL file.

CVE-2017-9646 has been assigned to this vulnerability. A CVSS v3
base score of 7.8 has been assigned; the CVSS vector string is
(AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

RESEARCHER

Karn Ganeshen reported this vulnerability to ICS-CERT.

BACKGROUND

Critical Infrastructure Sector(s): Energy

Countries/Areas Deployed: Unknown

Company Headquarters Location: Czech Republic

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov

ICS-CERT 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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