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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3529
           ICS Advisory (ICSA-20-287-03) - Flexera InstallShield
                              14 October 2020

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

Product:           Flexera InstallShield
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        None
CVE Names:         CVE-2016-2542  

Reference:         ASB-2019.0353
                   ESB-2016.1903
                   ESB-2016.1852
                   ESB-2016.1833

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-20-287-03

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ICS Advisory (ICSA-20-287-03)

Flexera InstallShield

Original release date: October 13, 2020

Legal Notice

All information products included in https://us-cert.gov/ics 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 https://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.3
  o ATTENTION: Low skill level to exploit
  o Vendor: Flexera
  o Equipment: InstallShield
  o Vulnerability: Untrusted Search Path

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow execution of a
malicious DLL.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Flexera InstallShield are affected:

  o Flexera InstallShield through 2015 SP1
  o Flexera InstallShield is integrated into many products sold by other
    companies

3.2 VULNERABILITY OVERVIEW

3.2.1 UNTRUSTED SEARCH PATH CWE-426

The affected product is subject to an untrusted search path vulnerability,
which may allow an attacker to execute a malicious DLL if placed into the
working directory of the setup-launcher executable file through social
engineering.

CVE-2016-2542 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:R/S:U/
C:H/I:H/A:H ).

3.3 BACKGROUND

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

3.4 RESEARCHER

An anonymous researcher reported this vulnerability to Flexera.

4. MITIGATIONS

It is recommended that users contact the product's vendor support team for
guidance on any mitigations and workarounds regarding Flexera InstallShield
issues in relation to that product.

For more information see Flexera's KBR-Article .

CISA recommends 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.

CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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 webpage on us-cert.gov 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 CISA for tracking
and correlation against other incidents.

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

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

CISA 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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