ESB-2018.1269 - [Win] Advantech WebAccess HMI Designer: Multiple vulnerabilities 2018-04-26

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1269
        Advisory (ICSA-18-114-03) Advantech WebAccess HMI Designer
                               26 April 2018

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

Product:           Advantech WebAccess HMI Designer
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
                   Denial of Service               -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-8837 CVE-2018-8835 CVE-2018-8833

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-114-03

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Advisory (ICSA-18-114-03)

Advantech WebAccess HMI Designer

Original release date: April 24, 2018

Legal Notice

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1. EXECUTIVE SUMMARY

    CVSS v3 6.3
    ATTENTION: Exploitable remotely/low skill level to exploit.
    Vendor: Advantech
    Equipment: Advantech WebAccess HMI Designer
    Vulnerabilities: Heap-based Buffer Overflow, Double Free, Out-of-bounds
    Write

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may allow an attacker to
remotely execute arbitrary code.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following version of Advantech WebAccess HMI Designer, a Human Machine
Interface (HMI) Runtime Development Software, is affected:

    Advantech WebAccess HMI Designer, Version 2.1.7.32 and prior.

3.2 VULNERABILITY OVERVIEW

3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122

Heap-based buffer overflow vulnerabilities caused by processing specially
crafted .pm3 files may allow remote code execution.

CVE-2018-8833 has been assigned to this vulnerability. A CVSS v3
base score of 6.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

3.2.2 DOUBLE FREE CWE-415

Double free vulnerabilities caused by processing specially crafted .pm3
files may allow remote code execution.

CVE-2018-8835 has been assigned to this vulnerability. A CVSS v3
base score of 6.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

3.2.3 OUT-OF-BOUNDS WRITE CWE-787

Processing specially crafted .pm3 files may cause the system to write
outside the intended buffer area and may allow remote code execution.

CVE-2018-8837 has been assigned to this vulnerability. A CVSS v3
base score of 6.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L).

3.3 BACKGROUND

    Critical Infrastructure Sectors: Critical Manufacturing, Energy,
    Water and Wastewater Systems
    Countries/Areas Deployed: East Asia, United States, Europe
    Company Headquarters Location: Taiwan

3.4 RESEARCHER

Steven Seeley of Source Incite working with Trend Micro's Zero Day
Initiative (ZDI) reported these vulnerabilities to NCCIC.

4. MITIGATIONS

NCCIC is working with Advantech to provide mitigation steps to resolve
the issues that have been reported in Advantech's WebAccess HMI Designer.

NCCIC recommends that users take defensive measures to minimize the risk
of exploitation of these vulnerabilities. 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 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 website.

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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