22 October 2015
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2671 3S CODESYS Gateway Null Pointer Exception Vulnerability 22 October 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: 3S CODESYS Gateway Server Publisher: ICS-CERT Operating System: Windows Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-6484 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-15-293-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-15-293-03) 3S CODESYS Gateway Null Pointer Exception Vulnerability Original release date: October 20, 2015 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/. OVERVIEW Ashish Kamble of Qualys, Inc has identified a null pointer exception vulnerability in 3S-Smart Software Solutions GmbH's CODESYS Gateway Server. 3S-Smart Software Solutions GmbH has produced a new version to mitigate this vulnerability. Ashish Kamble has tested the new version to validate that it resolves the vulnerability. This vulnerability could be exploited remotely. AFFECTED PRODUCTS The following Gateway Server versions are affected: CODESYS Gateway Server, Version 126.96.36.199 and prior versions. IMPACT Null pointer exceptions cause the server to crash creating a denial of service. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND 3S-Smart Software Solutions GmbH is headquartered in Kempten, Germany, and has distributors in more than 10 countries worldwide. The affected product, CODESYS Gateway Server, is a software-defined server. This server is primarily found in the Critical Manufacturing and Energy sectors. 3S-Smart Software Solutions GmbH estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW NULL POINTER EXCEPTION[a] The server fails in handling certain HTTP POST/GET requests leading to a null pointer exception causing the server process to crash. The result of the crash would be a denial of service. CVE-2015-6484[b] has been assigned to this vulnerability. A CVSS v3 base score of 7.5 and a temporal score of 6.5 have been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:R).[c] VULNERABILITY DETAILS EXPLOITABILITY This vulnerability could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target this vulnerability. DIFFICULTY An attacker with a low skill would be able to exploit this vulnerability. MITIGATION 3S-Smart Software Solutions GmbH has released a new version of CODESYS, Version 188.8.131.52, which addresses the null pointer exception vulnerability. CODESYS, Version 184.108.40.206 is available at the following location with a valid user account: https://www.codesys.com/download/download-center.html (link is external) For additional information about the new version of CODESYS or questions about the vulnerability, the CODESYS Support Team's contact information is as follows: https://www.codesys.com/support-training/codesys-support/inquiry-per-phone-e-mail.html ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents. a. CWE-476: NULL Pointer Dereference, http://cwe.mitre.org/data/definitions/476.html, web site last accessed October 20, 2015. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6484, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed October 20, 2015. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: firstname.lastname@example.org Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov ICS-CERT continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------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 email@example.com 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: firstname.lastname@example.org Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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