Fazecast jSerialComm

# ICS Advisory (ICSA-20-126-01) ## Fazecast jSerialComm Original release date: May 05, 2020 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA2012601) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA2012601) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA2012601) ### 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:** Fazecast * **Equipment:** jSerialComm * **Vulnerability:** Uncontrolled Search Path Element ## 2\. RISK EVALUATION Successful exploitation of this vulnerability could allow an unauthenticated attacker to execute arbitrary code on a targeted system. ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following versions of jSerialComm, a platform-independent serial communication for Java, are affected: * Version 2.2.2 and prior Schneider Electric reports the vulnerability affects the following EcoStruxure IT Gateway versions: * Versions 1.5.x, 1.6.x, 1.7.x CISA will update this document as more mitigations are identified by affected vendors. ### 3.2 VULNERABILITY OVERVIEW #### 3.2.1 [UNCONTROLLED SEARCH PATH ELEMENT CWE-427](https://cwe.mitre.org/data/definitions/427.html) An uncontrolled search path element vulnerability could allow a malicious DLL file with the same name of any resident DLLs inside the software installation to execute arbitrary code. [CVE-2020-10626](http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-10626) 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:L/UI:N/S:U/C:H/I:H/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing, Information Technology * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** United States ### 3.4 RESEARCHER Ryan Wincey (@rwincey) of Securifera working with Trend Micro's Zero Day Initiative reported this vulnerability to CISA. ## 4\. MITIGATIONS Fazecast, Inc., recommends users update jSerialComm to [Version 2.3 or later](https://github.com/Fazecast/jSerialComm/releases). Schneider Electric recommends users upgrade EcoStruxure IT Gateway to [Version 1.8.1 or later](https://helpcenter.ecostruxureit.com/hc/en- us/articles/360012105013). CISA recommends 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](https://www.us-cert.gov/sites/default/files/publications/emailscams_0905.pdf) for more information on avoiding email scams. * Refer to [Avoiding Social Engineering and Phishing Attacks](https://www.us-cert.gov/ncas/tips/ST04-014) 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies](https://www.us- cert.gov/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 webpage on us-cert.gov](https://www.us-cert.gov/ics) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS- TIP-12-146-01B). 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 exploitable remotely.