CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
54.1%
This updated advisory is a follow-up to the updated advisory titled ICSA-19-043-06 Siemens CP1604 and CP1616 that was published February 12, 2019, on the former ICS-CERT website.
Successful exploitation of these vulnerabilities could result in a denial-of-service condition and information exposure. An attacker could inject arbitrary JavaScript in a specially crafted URL request to execute on unsuspecting userβs systems, allowing an attacker to trigger actions via the web interface that a legitimate user is allowed to perform.
Siemens reports the following CP products are affected:
4.2.1 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319
An attacker with network access to Port 23/TCP could extract internal communication data or cause a denial-of-service condition.
CVE-2018-13808 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).
4.2.2 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION (βCROSS-SITE SCRIPTINGβ) CWE-79
The integrated web server of the affected CP devices could allow cross-site scripting (XSS) attacks if unsuspecting users are tricked into following a malicious link.
CVE-2018-13809 has been assigned to this vulnerability. A CVSS v3 base score of 6.1 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N).
4.2.3 CROSS-SITE REQUEST FORGERY CWE-352
The integrated configuration web server of the affected CP devices could allow a cross-site request forgery (CSRF) attack if an unsuspecting user is tricked into accessing a malicious link.
CVE-2018-13810 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
Water and Wastewater Systems
Siemens reported these vulnerabilities to NCCIC.
Siemens recommends users update to version 2.8.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
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As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemensβ operational guidelines for industrial security (<https://www.siemens.com/cert/operational-guidelines-industrial-security>), and following the recommendations in the product manuals.
Additional information on industrial security by Siemens can be found at:
<https://www.siemens.com/industrialsecurity>
For more information on these vulnerabilities and associated software updates, please see Siemens security advisory SSA-559174 on their website:
<https://www.siemens.com/cert/advisories>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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 on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-13808
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-13809
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-13810
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cwe.mitre.org/data/definitions/319.html
cwe.mitre.org/data/definitions/352.html
cwe.mitre.org/data/definitions/79.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
AI Score
Confidence
High
EPSS
Percentile
54.1%