CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
AI Score
Confidence
High
EPSS
Percentile
69.5%
Siemens has reported multiple vulnerabilities in the Siemens WinCC WebNavigator application. These vulnerabilities were originally reported directly to Siemens by Positive Technologies. Siemens has produced an update that mitigates these vulnerabilities. These vulnerabilities could be exploited remotely.
Siemens reports that these vulnerabilities affect the WebNavigator component of the following versions of WinCC:
Successful exploitation of these vulnerabilities could allow an attacker to access sensitive data or possibly take over the WebNavigator session with the same rights as the victim.
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.
WinCC/Web Navigator is a WinCC option that provides a Web interface for the Siemens SIMATIC WinCC Human Machine Interface (HMI). SIMATIC WinCC performs the following tasks: process visualization, operator control of the process, alarm display, process value and alarm archiving, and machine parameter management. This software is used in many industries, including food and beverage, water and wastewater, oil and gas, and chemical.
An attacker can use social engineering to trick an authenticated user into clicking a malicious link. This action may execute a java script in the victimβs browser, which can have malicious behavior such as stealing a session cookie.
CVE-2012-3031 has been assigned to this vulnerability. A CVSS v2 base score of 8.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:C).
Cross site request forgery is similar to the cross site scripting vulnerability (see above). It can also be triggered by an authenticated user clicking on a malicious link. However, this vulnerability also works if the user has disabled scripting in his or her browser.
CVE-2012-3028 has been assigned to this vulnerability. A CVSS v2 base score of 7.8 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:N/I:P/A:C).
If an attacker knows or guesses the right path and/or file name, he or she can read files on the system that hosts WebNavigator.
[CVE-2012-3030](<http://NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3030>) has been assigned to this vulnerability. A CVSS v2 base score of 5.0 has been assigned; the CVSS vector string is (AV:N/AC:L/Au:N/C:P/I:N/A:N).
If an attacker sends a specially crafted SOAP (Simple Object Access Protocol) message to the server, the resulting SQL queries might read or write more data in the database than originally intended.
CVE-2012-3032k 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).
WebNavigator uses ActiveX controls in the userβs browser. The methods of these ActiveX controls can be called by any Web site this user visits. By using specially crafted parameters with these methods, an attacker can gain access to the username and password of a legitimate user.
Precondition: to exploit this vulnerability, the attacker needs access to the Web server.
CVE-2012-3034 has been assigned to this vulnerability. A CVSS v2 base score of 8.3 has been assigned; the CVSS vector string is (AV:N/AC:M/Au:N/C:C/I:P/A:P).
These vulnerabilities could be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with a low to medium skill would be able to exploit these vulnerabilities.
Siemens addresses these issues in a Siemens Security Advisory, SSA-864051.
Siemens provides an update for WinCC 7.0 SP3, which fixes vulnerabilities 1, 3, 4, and 5, and recommends installing the patch. Siemens also recommends users restrict access to WebNavigator, e.g., with a firewall or VPN gateway or to operate the service only within trusted networks.
No patch is yet available for vulnerability 2; Siemens recommends the following:
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks:
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. 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-12-146-01AβCyber Intrusion Mitigation Strategies.
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.
In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks:
ics-cert.preview.us-cert.gov/web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3032
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3030
nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:L/Au:N/C:P/I:N/A:N)
nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:L/Au:N/C:P/I:P/A:C)
nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:M/Au:N/C:C/I:P/A:P)
nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:M/Au:N/C:N/I:P/A:C)
nvd.nist.gov/cvss.cfm?version=2&vector=(AV:N/AC:M/Au:N/C:P/I:P/A:C)
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3028=
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3031
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2012-3034
www.siemens.com/corporate-technology/en/research-areas/siemens-cert-security-advisories.htm
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