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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2012.0746 SIEMENS SYNCO OZW DEFAULT PASSWORD 8 August 2012 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens Synco OZW Web Server Publisher: US-CERT Operating System: Network Appliance Impact/Access: Administrator Compromise -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2012-3020 Original Bulletin: http://www.us-cert.gov/control_systems/pdf/ICSA-12-214-01.pdf - --------------------------BEGIN INCLUDED TEXT-------------------- ICS-CERT ADVISORY ICSA-12-214-01 - SIEMENS SYNCO OZW DEFAULT PASSWORD August 01, 2012 OVERVIEW Siemens has reported to ICS-CERT that a default password vulnerability exists in the Siemens Synco OZW Web Server device used for building automation systems. Siemens urges their customers to set a secure password on their devices web interface. This vulnerability could be exploited remotely. AFFECTED PRODUCTS Siemens reports that the default password vulnerability affects the following Synco models: OZW775 OZW672.01, OZW672.04, OZW672.16 OZW772.01, OZW772.04, OZW772.16, OZW772.250. For the listed products, all firmware versions prior to Version 4 do not force users to change their password on initial login. IMPACT An attacker could use the default password in these devices to gain unauthorized administrative access to the building automation network. Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation. BACKGROUND Siemens Synco OZW devices are used for remote operation and monitoring of building automation devices. The affected models offer interfaces that can be used over networks, such as the Internet. VULNERABILITY CHARACTERIZATION VULNERABILITY OVERVIEW DEFAULT PASSWORD [a] Siemens Synco OZW devices are shipped with a default password protecting administrative functions. The installation procedure does not enforce a password change. This leaves a potential security gap in the asset owner/operators network. CVE-2012-3020 [b] has been assigned to this vulnerability. A CVSS v2 base score of 9.0 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:P/I:P/A:C). [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 level could exploit these vulnerabilities. MITIGATION Siemens has released a firmware update (Version 4) for the OZW672 and OZW772 devices that enforces a password change at initial login. [d] Customers may upgrade to this firmware version, but this is not required to change the default password on existing devices. Siemens urges customers to set a secure password on the web interface for all network devices. ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks by performing the following tasks: * Minimize network exposure for all control system devices. Critical devices should not directly face 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), recognize that VPN is only as secure as the connected devices. The Control Systems Security Program (CSSP) also provides a section for control systems security recommended practices on the CSSP Web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. [e] ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures. Additional mitigation guidance and recommended practices are publicly available in the ICS-CERT Technical Information Paper, ICS-TIP-12-146-01 - Cyber Intrusion Mitigation Strategies, [f] which is available for download from the ICS-CERT Web page (www.ics-cert.org). 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. ICS-CERT CONTACT For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@dhs.gov Toll Free: 1-877-776-7585 For CSSP Information and Incident Reporting: www.ics-cert.org ICS-CERT continuously strives to improve its products and services. You can help by answering a very short series of questions about this product at the following URL: https://forms.uscert.gov/ncsd-feedback/. DOCUMENT FAQ What is an ICS-CERT Advisory? An ICS-CERT Advisory is intended to provide awareness or solicit feedback from critical infrastructure owners and operators concerning ongoing cyber events or activity with the potential to impact critical infrastructure computing networks. When is vulnerability attribution provided to researchers? Attribution for vulnerability discovery is always provided to the vulnerability reporter unless the reporter notifies ICS-CERT that they wish to remain anonymous. ICS-CERT encourages researchers to coordinate vulnerability details before public release. The public release of vulnerability details prior to the development of proper mitigations may put industrial control systems and the public at avoidable risk. REFERENCES [a] CWE-262: Not Using Password Aging, http://cwe.mitre.org/data/definitions/262.html, Web site last accessed August 01, 2012. [b] NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3020, 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:A/AC:L/Au:S/C:C/I:C/A:C), Web site last accessed August 01, 2012. [d] Siemens password change at initial login, http://support.automation.siemens.com/WW/view/en/41929231/130000, Web site last accessed August 01, 2012 [e] CSSP Recommended Practices, http://www.us-cert.gov/control_systems/practices/Recommended_Practices.html, Web site last accessed August 01, 2012. [f] Cyber Intrusion Mitigation Strategies, http://www.us-cert.gov/control_systems/pdf/ICS-TIP-12-146-01A.pdf, Web site last accessed August 01, 2012. - --------------------------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. 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: 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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBUCHKb+4yVqjM2NGpAQI6jhAAqXHlaMsSfxk/KVB+j195F6iYvMVlk6Sv jWgAYodIvVPFODDZcnR5vFr4rt5aq7v9yz7OIajfKFoXZ3sXj8SkKYmRQZlB+upK Eou7dHT37/nyKSzrbwFE8g0YiYsVzs5urpcYbpkSfAlHtyqsa7tcr9phmyFJ5dQL WUriru+GpuWCxHAB2mGjnYzDnMWhg2P9SD1Nq8fmd+mH5CkJrm2fgPuZUnLJMEe9 507n4msoC8nexhbQv3T1fVlACbq4rStzxNqfdP3OJmtd0hK+wfcPNqSR/EQ/Hibs V1NI2uGPjv63UYANG5zB+rlsvLkmrUVUKquX0syFfaSNPfyXGGO/wtAEgq+jxrlb wishcWeLDsMXNjWmpYZFsnJNEpJzsXnAMOH+qc0HwbU+W/kSlnW527fh52Q6BjpW EEgnrQL3pT5ybfo7q8Ki3po2phI1k2jRhfxw1i7s62DkmmKc0qja8/UM8lerzj8f lp0KWGlHZLbLmeDkhvxhsKz9bUfy0RwRKSd1V3vDnjDW+eOZJUsqmh/QJDTDBeah gOyP9xySXJbsH8zhpXGY5uDRGCnmO3tEIN3zanJqwpltTsLTwZu6DLVBYXjuch8w nmIH8ClDcU6SSejvo/tJkPHky4REcFYocFB1WDb46W1eqxc0aPhG8oX0zcu5Sr98 bhRJ28zUC/o= =pxJs -----END PGP SIGNATURE-----