CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
38.6%
Successful exploitation of these vulnerabilities could allow an attacker to retrieve or modify data and gain access to sensitive information.
The following Siemens products are affected:
The web service does not properly apply input validation for some query parameters, which may allow an attacker to retrieve data via a content based blind SQL injection attack.
CVE-2020-15792 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:L/UI:N/S:U/C:L/I:N/A:N).
The affected product is vulnerable to clickjacking, which may allow an attacker to retrieve or modify data in the context of a legitimate user by tricking that user to click on a website controlled by the attacker.
CVE-2020-15793 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N).
The affected product is vulnerable to exposure of sensitive information, which may allow an attacker to retrieve additional information about the host system.
CVE-2020-15794 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:L/UI:N/S:U/C:L/I:N/A:N).
Davide De Rubeis, Damiano Proietti, Matteo Brutti, Stefano Scipioni, and Massimiliano Brolli from TIM Security Red Team Research reported these vulnerabilities to Siemens.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:
As a general security measure Siemens strongly recommends protecting network access to affected products with appropriate mechanisms. It is advised to follow recommended security practices and run the devices in a protected IT environment.
For additional information, please refer to Siemens Security Advisory SSA-226339
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov. 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 webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-15792
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-15793
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-15794
cert-portal.siemens.com/productcert/pdf/ssa-226339.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-20-287-05
cwe.mitre.org/data/definitions/1021.html
cwe.mitre.org/data/definitions/200.html
cwe.mitre.org/data/definitions/89.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109781922
twitter.com/CISAgov
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www.us-cert.gov/ics/tips/ICS-TIP-12-146-01B
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CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
AI Score
Confidence
High
EPSS
Percentile
38.6%