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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2272 Moxa SoftCMS Buffer Overflow Vulnerabilities 31 August 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Moxa SoftCMS Publisher: US-CERT Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-6458 CVE-2015-6457 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-15-239-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-15-239-01) Moxa SoftCMS Buffer Overflow Vulnerabilities Original release date: August 27, 2015 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 NCCIC/ICS-CERT received a report from HPs Zero Day Initiative (ZDI) concerning buffer overflow vulnerabilities in Moxas SoftCMS software package. These vulnerabilities were reported to ZDI by security researcher Carsten Eiram of Risk Based Security, who identified seven vulnerabilities, and Fritz Sands, who discovered two vulnerabilities. Moxa has released a new version to mitigate these vulnerabilities. These vulnerabilities could be exploited remotely. AFFECTED PRODUCTS The following versions of Moxas SoftCMS are affected: SoftCMS, Version 1.3 and prior versions. IMPACT Successful exploitation of these vulnerabilities could cause a buffer overflow condition that may allow remote code execution. Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Moxa is a Taiwan-based company that maintains offices in several countries around the world, including the US, UK, India, Germany, France, China, Russia, and Brazil. The affected product, SoftCMS, is a central management software that manages large scale surveillance systems. According to Moxa, SoftCMS is deployed across several sectors including Commercial Facilities, Critical Manufacturing, Energy, Transportation Systems, and others. Moxa estimates that these products are used primarily in the United States and Europe with a small percentage in Asia. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW HEAP-BASED BUFFER OVERFLOW [a] The application is susceptible to multiple buffer overflow conditions that may crash or allow remote code execution. CVE-2015-6457 [b] has been assigned to this vulnerability. ZDI has assigned a CVSS v2 base score of 6.8; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:P). [c] CLASSIC BUFFER OVERFLOW [d] The application is susceptible to multiple buffer overflow conditions that may crash or allow remote code execution. CVE-2015-6458 [e] has been assigned to this vulnerability. ZDI has assigned a CVSS v2 base score of 6.8; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:P). [f] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with medium skill would be able to exploit these vulnerabilities. MITIGATION Moxa has released SoftCMS, Version 1.4 on June 1, 2015, which addresses the vulnerabilities by removing SStreamVideo ActiveX Control. SoftCMS, Version 1.4 can be downloaded at the following URL: http://www.moxa.com/support/download.aspx?type=support&id=8013 ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: Using application whitelisting will not prevent memory-based attacks, such as exploiting buffer overflows vulnerabilities, but it can prevent shellcode from running executables that have not been authorized, thereby limiting the impact of memory-based attacks that call files. 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 ICSCERT 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-122: Heap-based Buffer Overflow, http://cwe.mitre.org/data/definitions/122.html, web site last accessed August 27, 2015. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6457, 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, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P, web site last accessed August 27, 2015. d. CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), http://cwe.mitre.org/data/definitions/120.html, web site last accessed August 27, 2015. e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-6458, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. f. CVSS Calculator, http://nvd.nist.gov/cvss.cfm?version=2&vector=AV:N/AC:M/Au:N/C:P/I:P/A:P, web site last accessed August 27, 2015. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov 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 auscert@auscert.org.au 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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