CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
54.1%
Successful exploitation of these vulnerabilities could allow an attacker the ability to make configuration and password changes, capture device keys, access confidential information, and gain full control of the device.
Siemens reports the vulnerabilities affect the following LOGO! products:
An attacker who has access to a specific service may gain complete access to all services without authorization.
CVE-2020-25228 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
An attacker could execute replay attacks due to the usage of a static key, which may allow unauthorized password or configuration change on any affected device.
CVE-2020-25229 has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).
An attacker can use an outdated cipher mode, which may allow the extraction of the encryption key from captured communication with the device.
CVE-2020-25230 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
An attacker could use the affected deviceβs static key to decrypt program data, which may allow extraction of confidential information from protected program files.
CVE-2020-25231 has been assigned to this vulnerability. A CVSS v3 base score of 6.2 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
An attacker could extract the communication key that is used when communicating with an affected device, which may allow confidential information disclosure.
CVE-2020-25232 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
An attacker may obtain the private RSA key that is used for encrypting communication with the device, which may allow confidential information disclosure.
CVE-2020-25233 has been assigned to this vulnerability. A CVSS v3 base score of 6.2 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
An attacker could reverse engineer the user-defined functions directly from stored program files.
CVE-2020-25234 has been assigned to this vulnerability. A CVSS v3 base score of 7.7 has been calculated; the CVSS vector string is (AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
An attacker with access to network traffic could derive valid logins, which may allow confidential information disclosure.
CVE-2020-25235 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
Thomas Meesters from cirosec GmbH, Tobias Gebhardt, and Max BΓ€umler reported these vulnerabilities to Siemens.
Siemens has released updates for the affected products and recommends users update to the latest versions:
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemensβ operational guidelines for Industrial Security and to follow 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, please see Siemens Security Advisory SSA-480824
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.cisa.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.cisa.gov 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 CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25228
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25229
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25230
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25231
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25232
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25233
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25234
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-25235
cert-portal.siemens.com/productcert/pdf/SSA-480824.pdf
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cwe.mitre.org/data/definitions/306.html
cwe.mitre.org/data/definitions/321.html
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cwe.mitre.org/data/definitions/321.html
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cwe.mitre.org/data/definitions/327.html
cwe.mitre.org/data/definitions/522.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109783346/
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us-cert.cisa.gov/ics/alerts/ICS-ALERT-10-301-01
us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
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CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
54.1%