05 October 2018
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.3012 Advisory (ICSA-18-277-01) - WECON PI Studio 5 October 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: WECON PI Studio Publisher: ICS-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Administrator Compromise -- Remote with User Interaction Access Confidential Data -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2018-17889 CVE-2018-14818 CVE-2018-14814 CVE-2018-14810 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-277-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-277-01) WECON PI Studio Original release date: October 04, 2018 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: WECON Technology Co., Ltd. (WECON) o Equipment: PI Studio o Vulnerabilities: Stack-based Buffer Overflow, Out-of-Bounds Write, Information Exposure Through XML External Entity Reference, Out-of-Bounds Read 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow remote code execution, execution of code in the context of an administrator, read past the end of an allocated object or allow an attacker to disclose sensitive information under the context of administrator. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of PI Studio, a HMI project programmer, are affected: o PI Studio HMI: Versions 4.1.9 and prior, o PI Studio Versions 4.2.34 and prior. 3.2 VULNERABILITY OVERVIEW 3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 A stack-based buffer overflow vulnerability has been identified, which may allow remote code execution. CVE-2018-14818 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). 3.2.2 OUT-OF-BOUNDS WRITE CWE-787 The affected product parses files and passes invalidated user data to an unsafe method call, which may allow code to be executed in the context of an administrator. CVE-2018-14810 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). 3.2.3 INFORMATION EXPOSURE THROUGH XML EXTERNAL ENTITY REFERENCE CWE-611 When parsing project files, the XMLParser that ships with Wecon PIStudio is vulnerable to a XML external entity injection attack, which may allow sensitive information disclosure. CVE-2018-17889 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:U/C:H/ I:N/A:N). 3.2.4 OUT-OF-BOUNDS READ CWE-125 The affected product lacks proper validation of user-supplied data, which may result in a read past the end of an allocated object. CVE-2018-14814 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L /I:N/A:N). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing, Energy, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: China 3.4 RESEARCHER Mat Powell and Natnael Samson (Natti), working with Trend Micro's Zero Day Initiative, reported these vulnerabilities to NCCIC. 4. MITIGATIONS WECON has verified the vulnerabilities but has not yet released an updated version. NCCIC is currently working with WECON and will update the advisory once an updated version is released. NCCIC 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. 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. No known public exploits specifically target these vulnerabilities. Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to firstname.lastname@example.org and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBW7bF6maOgq3Tt24GAQjmlQ//QZrComGFGcQ2kbMhYFtB+HoaMenWH//Z ykRCet14yqwcBobrTCjx7wQhNmoaWXHB8zoienrk5Pme4gyPsvP72gfy5AZkRQkK lZrAUVRDxYusfvy7b/eUvMiysMe8QKB5dZpl9urMclXTX7rk3xGe7oPVJFUkOs1h CVljtrvMUn7ZDQhm44k/AMQtBJwPkFhhkKHm1OIio960mFDZjLHeRdcAfG8XIxtp pP1IEU6iibWmDoRBxJSu4lJugA+GkH4ArvNuqlu5+WRyRAIF2tgWR03OaSTmI3sc DmsZG89ZF5ttD6Ww/2NkNBNuLvEnmsosOpIpGTphu/D6et2qUdLZy+WFKdBf0yPT bFNCDtzOhezAUbW33YY9hxHX5DhM0aGrKJw653o623VyjcO3XQs/8MNospWzYJQ8 pr5JzKq7Ena3unrKaZp/vXugUQL9FcqAOfvJLoTumAW459OY8nxBNXlQ03D4mZ2S 67qX2/bBmE3pmycKQWYu6OShrTcPHSBi+LvP1Dv5nTdpVCz8G2L1AbWZozJqscyO kPz+/Pox22D01QTv38ON3HtE3iE7cP9DoNBuzTMAuHw4HlomvNVJAdXRQ3/MGRCi YFCQqAKV9DWHFnnxTMPwndM+TxrNliFPje0biWPI1u/Rpk7W9K00fb6U4FUWEClE iqB2Qust+Vc= =wobP -----END PGP SIGNATURE-----