LCDS - Leao Consultoria e Desenvolvimento de Sistemas Ltda ME LAquis SCADA ELS Files Out-of-Bounds Write (CVE-2019-6536)

# ICS Advisory (ICSA-19-073-01) ## LCDS - Leao Consultoria e Desenvolvimento de Sistemas Ltda ME LAquis SCADA ELS Files Original release date: March 14, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-073-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-073-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-073-01) ### Legal Notice All information products included in [https://us-cert.gov/ics](/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/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 7.8** * **ATTENTION:** Low skill level to exploit * **Vendor:** LCDS--Leao Consultoria e Desenvolvimento de Sistemas LTDA ME * **Equipment:** LAquis SCADA * **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: * SCADA 4.1.0.4150 ### 3.2 VULNERABILITY OVERVIEW **3.2.1 [OUT-OF-BOUNDS WRITE CWE-787](https://cwe.mitre.org/data/definitions/787.html)** 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Chemical, Commercial Facilities, Energy, Food and Agriculture, Transportation Systems, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** South America * **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: * Do not click web links or open unsolicited attachments in email messages. * Refer to [Recognizing and Avoiding Email Scams](/reading_room/emailscams_0905.pdf) for more information on avoiding email scams. * Refer to [Avoiding Social Engineering and Phishing Attacks](/cas/tips/ST04-014.html) 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](/ics/content/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](/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS-CERT website](/ics/) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](/ics/tips/ICS-TIP-12-146-01B). 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.