CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
51.8%
CVSS v3 7.5
**ATTENTION:**Exploitable remotely/low skill level to exploit
**Vendor:**Siemens
**Equipment:**LOGO!8 devices
**Vulnerabilities:**Improper Restriction of Operations within the Bounds of a Memory Buffer, Session Fixation
Successful exploitation of these vulnerabilities could allow an attacker to read the communication between the affected device and a user, and compromise the availability of the targeted system.
The following versions of LOGO!8 devices, that are used for basic small-scale automation tasks, are affected:
3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119
An attacker with network access to Port 10005/TCP of the LOGO!8 device could cause a denial-of-service condition by sending specially crafted packets. This security vulnerability could be exploited by an unauthenticated attacker with network access to the affected service. No user interaction is required, and successful exploitation could compromise the availability of the targeted system.
CVE-2019-6571 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
3.2.2 SESSION FIXATION CWE-384
The integrated webserver does not invalidate the Session ID upon user logout. An attacker who successfully extracted a valid Session ID is able to use it even after the user logs out. This security vulnerability could be exploited by an attacker in a privileged network position who is able to read the communication between the affected device and the user, or by an attacker who is able to obtain valid Session IDs through other means. To facilitate this exploit, the user must first invoke a session to the affected device.
CVE-2019-6584 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
Thomas Meesters from cirosec GmbH and Ruhr University of Bochum, and Christian Siemers and Irakli Edjibia from Hochschule Augsburg reported these vulnerabilities to Siemens.
For Siemens LOGO!8: 6ED1052-xyyxx-0BA8 FS:01 to FS:06 / Firmware version v1.80.xx and v1.81.xx: Siemens recommends upgrading to a new version.
Siemens has updates at <https://support.industry.siemens.com/cs/ww/en/view/109767410> for the following product:
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
Additional information on Industrial Security by Siemens can be found at: <https://www.siemens.com/industrialsecurity>
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-774850 at the following location: <http://www.siemens.com/cert/advisories>
NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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.
NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks:
No known public exploits specifically target these vulnerabilities. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6571
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-6584
www.siemens.com/cert/advisories
cert-portal.siemens.com/operational-guidelines-industrial-security.pdf
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-162-03
cwe.mitre.org/data/definitions/119.html
cwe.mitre.org/data/definitions/384.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/ww/en/view/109767410
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20LOGO%218%20Devices+https://www.cisa.gov/news-events/ics-advisories/icsa-19-162-03
www.dhs.gov
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www.dhs.gov/performance-financial-reports
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-19-162-03
www.oig.dhs.gov/
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mailto:?subject=Siemens%20LOGO%218%20Devices&body=www.cisa.gov/news-events/ics-advisories/icsa-19-162-03
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
51.8%