4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7 High
AI Score
Confidence
High
0.946 High
EPSS
Percentile
99.3%
CVSS v3 5.9
ATTENTION: Exploitable remotely
Vendor: Siemens
Equipment: Industrial Products
Vulnerability: Cleartext Transmission of Sensitive Information
This updated advisory is a follow-up to the updated advisory titled ICSA-18-226-02 Siemens OpenSSL Vulnerability in Industrial Products (Update D) that was published February 12, 2019, on the NCCIC/ICS-CERT website.
Successful exploitation of this vulnerability could result in unencrypted data being transmitted by the SSL/TLS record layer.
Siemens reports that the vulnerability affects the following industrial products:
** --------- Begin Update E Part 1 of 4 ---------**
--------- End Update E Part 1 of 4 ---------
--------- Begin Update E Part 2 of 4 ---------
--------- End Update E Part 2 of 4 ---------
4.2.1 CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION CWE-319
In OpenSSL 1.0.2 an “error state” mechanism was introduced. This “error state” mechanism does not work correctly if SSL_read() or SSL_write() is called directly by an application. This could result in data being sent out unencrypted by the SSL/TLS record layer.
Successful exploitation requires an attacker to cause a fatal error in the targeted SSL/TLS handshake algorithm, and that the targeted application calls SSL_read() or SSL_write() only after receiving the fatal error. No user interaction or privileges are required to exploit this security vulnerability. The vulnerability could allow a compromise of data confidentiality by transmitting it unencrypted over the network.
CVE-2017-3737 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
Siemens reported this vulnerability to NCCIC.
Siemens has provided updates for the following products to fix the vulnerability:
<https://support.industry.siemens.com/cs/us/en/view/109759122>
<https://support.industry.siemens.com/cs/us/en/view/109758794>
Contact customer support to obtain the update
--------- Begin Update E Part 3 of 4 ---------
<https://support.industry.siemens.com/cs/ww/en/view/29316343>
--------- End Update E Part 3 of 4 ---------
<https://support.industry.siemens.com/cs/ww/en/view/109478459>
<https://support.industry.siemens.com/cs/us/en/view/109478528>
<https://support.industry.siemens.com/cs/ww/en/view/109759753>
--------- Begin Update E Part 4 of 4 ---------
SIMATIC WinCC (TIA Portal) v14: Update to v14 SP1 Update 6,
<https://support.industry.siemens.com/cs/ww/en/view/109747387>
--------- End Update E Part 4 of 4 ---------
<https://support.industry.siemens.com/cs/ww/en/view/109755826>
<https://support.industry.siemens.com/cs/ww/en/view/109741461>
SIMATIC WinCC OA V3.14: Update to v3.14-P021
SIMATIC WinCC OA V3.15: Update to v3.15-P014
SIMATIC WinCC OA V3.16: Update to v3.16-P002
https://portal.etm.at/index.php?option=com_ content&view=category&id=67&layout=blog& Itemid=80
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
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 Siemens’ operational guidelines for Industrial Security (Download: <https://www.siemens.com/cert/operational-guidelines-industrial-security>), 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 this vulnerability and associated software updates, please see Siemens security advisory SSA-179516 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-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability. High skill level is needed to exploit.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-3737
cwe.mitre.org/data/definitions/319.html
portal.etm.at/index.php?option=com_%20content&view=category&id=67&layout=blog&%20Itemid=80
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
support.industry.siemens.com/cs/us/en/view/109478528
support.industry.siemens.com/cs/us/en/view/109758794
support.industry.siemens.com/cs/us/en/view/109759122
support.industry.siemens.com/cs/ww/en/view/109478459
support.industry.siemens.com/cs/ww/en/view/109741461
support.industry.siemens.com/cs/ww/en/view/109747387
support.industry.siemens.com/cs/ww/en/view/109755826
support.industry.siemens.com/cs/ww/en/view/109759753
support.industry.siemens.com/cs/ww/en/view/29316343
twitter.com/CISAgov
twitter.com/intent/tweet?text=Siemens%20OpenSSL%20Vulnerability%20in%20Industrial%20Products%20%28Update%20E%29+https://www.cisa.gov/news-events/ics-advisories/icsa-18-226-02
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-18-226-02&title=Siemens%20OpenSSL%20Vulnerability%20in%20Industrial%20Products%20%28Update%20E%29
www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/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-18-226-02
www.oig.dhs.gov/
www.siemens.com/cert/advisories
www.siemens.com/cert/operational-guidelines-industrial-security
www.siemens.com/industrialsecurity
www.surveymonkey.com/r/CISA-cyber-survey?product=https://www.cisa.gov/news-events/ics-advisories/icsa-18-226-02
www.usa.gov/
www.whitehouse.gov/
www.youtube.com/@cisagov
mailto:?subject=Siemens%20OpenSSL%20Vulnerability%20in%20Industrial%20Products%20%28Update%20E%29&body=www.cisa.gov/news-events/ics-advisories/icsa-18-226-02
4.3 Medium
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:N/AC:M/Au:N/C:P/I:N/A:N
5.9 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7 High
AI Score
Confidence
High
0.946 High
EPSS
Percentile
99.3%