ESB-2018.3067 - [Win] GE iFIX: Execute arbitrary code/commands - Existing account 2018-10-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3067
                     Advisory (ICSA-18-282-01) GE iFix
                              10 October 2018

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

Product:           GE iFIX
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-17925  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-18-282-01

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Advisory (ICSA-18-282-01)

GE iFix

Original release date: October 09, 2018

Legal Notice

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1. EXECUTIVE SUMMARY

  o CVSS v3 5.3
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: GE
  o Equipment: Gigasoft component of iFix
  o Vulnerability: Unsafe ActiveX Control Marked Safe For Scripting

2. RISK EVALUATION

Successful exploitation of this vulnerability could cause a buffer overflow
condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

GE reports this vulnerability in a Gigasoft component affects the following
iFix HMI products:

  o iFIX 2.0 - 5.0
  o iFIX 5.1,
  o iFIX 5.5, and
  o iFIX 5.8

Gigasoft components older than Version 8.0 are likely to be used in other
products from other vendors also.

3.2 VULNERABILITY OVERVIEW

3.2.1    UNSAFE ACTIVEX CONTROL MARKED SAFE FOR SCRIPTING CWE-623

Multiple instances of this vulnerability have been identified in the
third-party ActiveX object provided to GE iFIX by Gigasoft. Only the
independent use of the Gigasoft charting package outside the iFIX product may
expose users to the reported vulnerability. The reported method shown to
impact Internet Explorer is not exposed in the iFIX product, nor is the core
functionality of the iFIX product known to be impacted.

CVE-2018-17925 has been assigned to this vulnerability. A CVSS v3 base score
of 5.3 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:R/S:U
/C:L/I:L/A:L).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Multiple sectors
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

LiMingzheng of 360 aegis security team reported this vulnerability to NCCIC.

4. MITIGATIONS

GE released iFIX 5.9 in June 2017 to address this issue by incorporating
Gigasoft Version 8.0

GE recommends users only use ActiveX from trusted sources.

To obtain the latest versions of the iFIX product, please contact the local GE
Digital representative. Contact information is available at:

https://digitalsupport.ge.com/communities/CC_Contact

For more information on this vulnerability and associated software updates,
please see GE Security Communication GED SecComm 18-01 dated March 27, 2018 on
the GE website:

https://digitalsupport.ge.com/communities/en_US/Article/KB0024470

NCCIC recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. 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 against other incidents.

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