ESB-2019.0846 - [Win] LAquis SCADA: Execute arbitrary code/commands - Existing account 2019-03-15

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0846
            Advisory (ICSA-19-073-01) LCDS - Leao Consultoria e
        Desenvolvimento de Sistemas Ltda ME LAquis SCADA ELS Files
                               15 March 2019

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

Product:           LAquis SCADA
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-6536  

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-19-073-01

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Advisory (ICSA-19-073-01)

LCDS - Leao Consultoria e Desenvolvimento de Sistemas Ltda ME LAquis SCADA ELS
Files

Original release date: March 14, 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
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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 7.8
  o ATTENTION: Low skill level to exploit
  o Vendor: LCDS-Leao Consultoria e Desenvolvimento de Sistemas LTDA ME
  o Equipment: LAquis SCADA
  o Vulnerability: Out-of-Bounds Write

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow remote code
execution.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following version of LAquis SCADA, an industrial automation software, is
affected:

  o SCADA 4.1.0.4150

3.2 VULNERABILITY OVERVIEW

3.2.1 OUT-OF-BOUNDS WRITE CWE-787

Opening specially crafted ELS file may result in a write past the end of an
allocated buffer, which may allow an attacker to execute remote code in the
context of the current process.

CVE-2019-6536 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Commercial Facilities, Energy,
    Food and Agriculture, Transportation Systems, Water and Wastewater Systems
  o COUNTRIES/AREAS DEPLOYED: South America
  o COMPANY HEADQUARTERS LOCATION: Brazil

3.4 RESEARCHER

Mat Powell, working with Zero Day Initiative, reported this vulnerability to
NCCIC.

4. MITIGATIONS

LCDS recommends users update to Version 4.3.1.71, which can be found at the
following location:

https://laquisscada.com

NCCIC recommends that 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.

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.

This vulnerability is exploitable locally. No known public exploits
specifically target this vulnerability.

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