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AUSCERT External Security Bulletin Redistribution
ESB-2020.3555
Advisory (icsa-20-287-06) Siemens SIPORT MP
15 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SIPORT MP
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Existing Account
Provide Misleading Information -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7591
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-287-06
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ICS Advisory (ICSA-20-287-06)
Siemens SIPORT MP
Original release date: October 13, 2020
Legal Notice
All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any information contained
within. DHS does not endorse any commercial product or service, referenced in
this product or otherwise. Further dissemination of this product is governed by
the Traffic Light Protocol (TLP) marking in the header. For more information
about TLP, see https://www.us-cert.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 8.8
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: SIPORT MP
o Vulnerability : Use of client-side authentication
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an authenticated
attacker to impersonate other users of the system and perform (potentially
administrative) actions on behalf of those users if the single sign-on feature
("Allow logon without password") is enabled.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SIPORT MP, a system for access control and time
management within the Siveillance Access Suite, are affected:
o SIPORT MP: Versions 3.2.1 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 USE OF CLIENT-SIDE AUTHENTICATION CWE-603
The affected product has an authentication bypass, which could make it
vulnerable to an attacker impersonating a system user.
CVE-2020-7591 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens ProductCERT reported this vulnerability to CISA.
4. MITIGATIONS
Siemens has released an updated version ( v3.2.1 ) of SIPORT MP and recommends
users install this update on all affected systems.
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce risk:
o For installations where the update to Version 3.2.1 is not possible,
contact Siemens support for deployment and specific mitigation measures.
For additional information, please refer to Siemens Security Advisory:
SSA-384879
As a general security measure, Siemens strongly recommends users to protect
network access to affected products with appropriate mechanisms. It is advised
to follow recommended security practices in order to run the devices in a
protected IT environment.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that VPN
is only as secure as the connected devices.
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.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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