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AUSCERT External Security Bulletin Redistribution
SIEMENS SYNCO OZW DEFAULT PASSWORD
8 August 2012
AusCERT Security Bulletin Summary
Product: Siemens Synco OZW Web Server
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
CVE Names: CVE-2012-3020
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ICSA-12-214-01 - SIEMENS SYNCO OZW DEFAULT PASSWORD
August 01, 2012
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.
Siemens reports that the default password vulnerability affects the following
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.
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
ICS-CERT recommends that organizations evaluate the impact of this
vulnerability based on their operational environment, architecture, and product
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.
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
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
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
An attacker with a low-skill level could exploit these vulnerabilities.
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
* 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.
For any questions related to this report, please contact ICS-CERT at:
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/.
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
[a] CWE-262: Not Using Password Aging,
http://cwe.mitre.org/data/definitions/262.html, Web site last accessed August
[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,
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,
Web site last accessed August 01, 2012.
[f] Cyber Intrusion Mitigation Strategies,
Web site last accessed August 01, 2012.
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