CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
50.3%
Independent researcher Aditya Sood has identified a cross-site scripting vulnerability in Siemens OZW672 and OZW772 devices. Siemens has produced a firmware update to mitigate this vulnerability.
This vulnerability could be exploited remotely.
Siemens reports that the vulnerability affects the following products:
An attacker who exploits this vulnerability may be able to change data and settings on the target device.
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.
Siemens is an international company headquartered in Munich, Germany.
OZW devices are web servers used for remote monitoring of building controller devices, such as heating or air conditioning. According to Siemens, these devices are deployed across several sectors, including Commercial Facilities. Siemens estimates that these products are used worldwide.
The web server login form input is not sanitized correctly, which results in a cross-site scripting vulnerability.
CVE-2016-1488NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-1488, web site last accessed January 19, 2016. has been assigned to this vulnerability. A CVSS v3 base score of 4.7 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N).CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N, web site last accessed January 19, 2016.
This vulnerability could be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with a medium skill would be able to exploit this vulnerability.
Siemens has created firmware updates to fix the vulnerability. Siemens recommends customers upgrade to the new firmware versions. As a general security measure, Siemens strongly recommends to protect network access to OZW products with appropriate mechanisms. It is advised to follow recommended security practices in order to run the devices in a protected IT environment.
Firmware updates for OZW672 products can be obtained at:
<https://support.industry.siemens.com/cs/ww/en/view/62567396>
Firmware updates for OZW772 products can be obtained at:
<https://support.industry.siemens.com/cs/ww/en/view/62564534>
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-743465 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
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 ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted 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.
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS
Percentile
50.3%