WECON LeviStudioU (Update A) Stack-based Buffer Overflow, Heap-based Buffer Overflow, Out-of-Bounds Write, Improper Restriction of XML External Entity Reference (CVE-2018-10614 CVE-2018-10610 CVE-2018-10606 CVE-2018-10602 )

# ICS Advisory (ICSA-18-212-03) ## WECON LeviStudioU (Update A) Original release date: July 31, 2018 | Last revised: October 02, 2018 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-18-212-03) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-18-212-03) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-18-212-03) ### 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 8.8** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** WECON Technology Co., Ltd * **Equipment:** LeviStudioU **\--------- Begin Update A Part 1 of 3 ---------** * **Vulnerabilities:** Stack-based Buffer Overflow, Heap-based Buffer Overflow, Out-of-Bounds Write, Improper Restriction of XML External Entity Reference **\--------- End Update A Part 1 of 3 ---------** ## 2 . UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-18-212-03 WECON LeviStudioU that was published July 31, 2018, on the NCCIC/ICS-CERT website. ## 3\. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to execute remote code. ## 4\. TECHNICAL DETAILS ### 4.1 AFFECTED PRODUCTS According to Zero Day Initiative (ZDI) the following product and versions are affected: * LeviStudioU, Versions 1.8.29 and 1.8.44 ### 4.2 VULNERABILITY OVERVIEW **4.2.1 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html)** Multiple stack-based buffer overflow vulnerabilities can be exploited when the application processes specially crafted project files. [CVE-2018-10602](https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-10602) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:N/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:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)). **4.2.2 [HEAP-BASED BUFFER OVERFLOW CWE-122](https://cwe.mitre.org/data/definitions/122.html)** Multiple heap-based buffer overflow vulnerabilities can be exploited when the application processes specially crafted project files. [CVE-2018-10606](https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-10606) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:N/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:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)). **\--------- Begin Update A Part 2 of 3 --------** #### 4.2.3 [OUT-OF-BOUNDS WRITE CWE-787](https://cwe.mitre.org/data/definitions/787.html) An out-of-bounds vulnerability can be exploited when the application processes specially crafted project files. [CVE-2018-10610](https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-10610) has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ([AV:N/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:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N)). #### 4.2.4 [IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE ('XXE') CWE-611](https://cwe.mitre.org/data/definitions/611.html) An XXE vulnerability can be exploited when the application processes specially crafted project XML files. [CVE-2018-10614](https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-10614) has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N)). **\--------- End Update A Part 2 of 3 -------- ** ### 4.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing, Energy, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** China ### 4.4 RESEARCHER **\--------- Begin Update A Part 3 of 3 --------** The NSFOCUS security team and Ghirmay Desta, working with Trend Micro's Zero Day Initiative, and Mat Powell and Jose Luis Zayas Banderas of Trend Micro's Zero Day Initiative reported these vulnerabilities to NCCIC. **\--------- End Update A Part 3 of 3 --------** ## 5\. MITIGATIONS Updating to the latest version of LeviStudioU may address some of the vulnerabilities. NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](/ics/alerts/ICS-ALERT-10-301-01). * Locate control system networks and remote devices behind firewalls, and isolate them from the business network. * 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](/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. No known public exploits specifically target these vulnerabilities.