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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1595 Meinberg NTP Time Server Vulnerabilities 24 June 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Meinberg NTP Time Server products Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Root Compromise -- Existing Account Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-3989 CVE-2016-3988 CVE-2016-3968 CVE-2016-3962 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-16-175-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-16-175-03) Meinberg NTP Time Server Vulnerabilities Original release date: June 23, 2016 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 Independent researcher Ryan Wincey has identified a stack buffer overflow vulnerability and a privilege escalation vulnerability in Meinbergs NTP Time Servers Interface. Meinberg has produced a new Version 6.20.004 to mitigate these vulnerabilities. The researcher has validated the firmware update. He confirms the update fixes these vulnerabilities. These vulnerabilities could be exploited remotely. AFFECTED PRODUCTS The following Meinberg products are affected: IMS-LANTIME M3000 Version 6.0 and earlier, IMS-LANTIME M1000 Version 6.0 and earlier, IMS-LANTIME M500 Version 6.0 and earlier, LANTIME M900 Version 6.0 and earlier, LANTIME M600 Version 6.0 and earlier, LANTIME M400 Version 6.0 and earlier, LANTIME M300 Version 6.0 and earlier, LANTIME M200 Version 6.0 and earlier, LANTIME M100 Version 6.0 and earlier, SyncFire 1100 Version 6.0 and earlier, and LCES Version 6.0 and earlier. IMPACT Successful exploitation of these vulnerabilities could cause a buffer overflow condition that may allow escalation to root privileges. Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. BACKGROUND Meinberg is a Germany-based company that maintains offices around the world, including North America, South America, Europe, Asia, Africa, and Australia. The affected products are NTP Time Servers. According to Meinberg, IMS-LANTIME, LANTIME, SyncFire, and LCES Series are deployed across several sectors including Communications, Defense Industrial Base, Energy, Financial Services, Transportation Systems, and others. Meinberg estimates that these products are used worldwide. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW STACK-BASED BUFFER OVERFLOW [a] Remote stack buffer overflow vulnerability involving parsing of parameter in POST request in function provides privilege of web server nobody. CVE-2016-3962 [b] has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). [c] STACK-BASED BUFFER OVERFLOW [d] Remote stack buffer overflow vulnerability is present while parsing nine different parameters in POST request in function. CVE-2016-3988 [e] has been assigned to this vulnerability. A CVSS v3 base score of 7.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/ C:L/I:L/A:L). [f] PRIVILEGE ESCALATION [g] Weak access controls allow for privilege escalation from nobody to root user. nobody has permissions to alter script that can only run as root. CVE-2016-3989 [h] has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N). [i] VULNERABILITY DETAILS EXPLOITABILITY These vulnerabilities could be exploited remotely. EXISTENCE OF EXPLOIT No known public exploits specifically target these vulnerabilities. DIFFICULTY An attacker with a low skill would be able to exploit these vulnerabilities. MITIGATION Meinberg has produced a new firmware Version 6.20.004. The new firmware can be downloaded by using the link below: https://urldefense.proofpoint.com/v2/url?u=http-3A__www.meinberg.de_download_firmware_lantime_v6_firmware-2D6.20.004-2Dx86.rel&d=BQIFaQ&c=54IZrppPQZKX9mLzcGdPfFD1hxrcB__aEkJFOKJFd00&r=zE5lG3CZZIbdBvT6slVAzQ&m=n4ZBSsrF-RphS7eiqohm3WcJ2BYQUCwQUHwVPHNFa6o&s=WlQnlBzw05tnJ1o29nmeXtGBbNubzjyRPqaWAdpXn5Y&e= (link is external) 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 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-121: Stack-based Buffer Overflow, http://cwe.mitre.org/data/definitions/121.html, web site last accessed June 23, 2016. b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3962, 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 June 23, 2016. d. CWE-121: Stack-based Buffer Overflow, http://cwe.mitre.org/data/definitions/121.html, web site last accessed June 23, 2016. e. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3968, 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, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S..., web site last accessed June 23, 2016. g. CWE-121: Stack-based Buffer Overflow, http://cwe.mitre.org/data/definitions/121.html, web site last accessed June 23, 2016. h. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-3989, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. i. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S..., web site last accessed June 23, 2016. Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) 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. 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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: auscert@auscert.org.au 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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