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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.4384
            Advisory (icsa-19-323-01) Flexera FlexNet Publisher
                             20 November 2019

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

Product:           Flexera FlexNet Publisher
Publisher:         ICS-CERT
Operating System:  Windows
                   Linux variants
                   Mac OS
Impact/Access:     Denial of Service               -- Remote/Unauthenticated
                   Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-20034 CVE-2018-20033 CVE-2018-20032
                   CVE-2018-20031  

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-19-323-01

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ICS Advisory (ICSA-19-323-01)

Flexera FlexNet Publisher

Original release date: November 19, 2019

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/ .

1. EXECUTIVE SUMMARY

  o CVSS v3 9.8
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Flexera
  o Equipment: FlexNet Publisher
  o Vulnerabilities: Improper Input Validation, Memory Corruption

2. RISK EVALUATION

These vulnerabilities could allow an attacker to deny the acquisition of a
valid license for legal use of the product. The memory corruption vulnerability
could allow remote code execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of FlexNet Publisher, a software license manager, are
affected:

  o FlexNet Publisher Version 2018 R3 and prior

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER INPUT VALIDATION CWE-20

A vulnerability related to preemptive item deletion in lmgrd and vendor daemon
components allows a remote attacker to send a combination of messages to lmgrd
or the vendor daemon, causing the heartbeat between lmgrd and the vendor daemon
to stop and the vendor daemon to shut down.

CVE-2018-20031 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).

3.2.2 IMPROPER INPUT VALIDATION CWE-20

A vulnerability related to message decoding in lmgrd and vendor daemon
components allows a remote attacker to send a combination of messages to lmgrd
or the vendor daemon, causing the heartbeat between lmgrd and the vendor daemon
to stop and the vendor daemon to shut down.

CVE-2018-20032 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).

3.2.3 MEMORY CORRUPTION CWE-119

A vulnerability in lmgrd and vendor daemon components could allow a remote
attacker to corrupt the memory by allocating/deallocating memory, loading lmgrd
or the vendor daemon, and causing the heartbeat between lmgrd and the vendor
daemon to stop. This would force the vendor daemon to shut down. The
vulnerability could also allow remote code execution. No exploit of this
vulnerability has been demonstrated.

CVE-2018-20033 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).

3.2.4 IMPROPER INPUT VALIDATION CWE-20

A vulnerability related to adding an item to a list in lmgrd and vendor daemon
components allows a remote attacker to send a combination of messages to lmgrd
or the vendor daemon, causing the heartbeat between lmgrd and the vendor daemon
to stop and the vendor daemon to shut down.

CVE-2018-20034 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Information Technology
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: United States

3.4 RESEARCHER

Sergey Temnikov of Kaspersky reported these vulnerabilities to CISA.

4. MITIGATIONS

Flexera recommends all users using affected versions of FlexNet Publisher
upgrade to Version 2018 R4 or newer as soon as possible. The updates can be
obtained with a customer account at the following location (login required):

https://flexerasoftware.flexnetoperations.com/control/inst/loginnextURL=
%2Fcontrol%2Finst%2Findex

More information on this issue can be found at the following location on the
Flexera site:

https://community.flexera.com/t5/FlexNet-Publisher-News/
FlexNet-Publisher-2018-R4-SP1-is-now-available/ba-p/95063/jump-to/
first-unread-message

CISA 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.

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 these vulnerabilities.

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