CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
Percentile
48.5%
**ATTENTION:**Remotely exploitable.
Vendor: Siemens
Equipment: LOGO! Soft Comfort
Vulnerability: Download of Code without Integrity Check
Siemens reports that the vulnerability affects the following LOGO! Soft Comfort engineering software products:
Successful exploitation of this vulnerability could allow a remote attacker in a privileged network position to manipulate a software package during download.
Siemens removed the Update Center from LOGO! Soft Comfort V8.2 and provides SHA-256 checksums for all LOGO! Soft Comfort software packages via a secured HTTPS channel. Siemens recommends verifying legitimacy by comparing the SHA-256 checksum of the downloaded software package with the SHA-256 checksum provided for the software package. Software version 8.2 for LOGO! Soft Comfort and SHA-256 checksums for LOGO! Soft Comfort downloads can be obtained via:
<https://www.siemens.com/logo-update>
As a general security measure, Siemens strongly recommends protecting network access to the devices with appropriate mechanisms. Siemens advises configuring the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment.
<https://www.siemens.com/cert/operational-guidelines-industrial-security>
For more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-888929 at the following location:
<http://www.siemens.com/cert/en/cert-security-advisories.htm>
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT 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 in the ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
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:
No known public exploits specifically target this vulnerability. High skill level is needed to exploit.
The update center of LOGO! Soft Comfort lacks integrity verification on software packages downloaded via an unprotected communication channel. This could allow a remote attacker to manipulate the software package while performing a man-in-the-middle (MitM) attack.
CVE-2017-12740 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:N/I:H/A:N).
Tobias Gebhardt reported this vulnerability to Siemens.
Critical Infrastructure Sectors: Commercial Facilities, Transportation Systems
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-12740
www.siemens.com/cert/en/cert-security-advisories.htm
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-17-353-04
cwe.mitre.org/data/definitions/494.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20LOGO%21%20Soft%20Comfort+https://www.cisa.gov/news-events/ics-advisories/icsa-17-353-04
www.dhs.gov
www.dhs.gov/foia
www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
www.facebook.com/sharer/sharer.php?u=https://www.cisa.gov/news-events/ics-advisories/icsa-17-353-04&title=Siemens%20LOGO%21%20Soft%20Comfort
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
www.instagram.com/cisagov
www.linkedin.com/company/cybersecurity-and-infrastructure-security-agency
www.linkedin.com/sharing/share-offsite/?url=https://www.cisa.gov/news-events/ics-advisories/icsa-17-353-04
www.oig.dhs.gov/
www.siemens.com/cert/operational-guidelines-industrial-security
www.siemens.com/logo-update
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20LOGO%21%20Soft%20Comfort&body=www.cisa.gov/news-events/ics-advisories/icsa-17-353-04
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:N/C:N/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS
Percentile
48.5%