# ICS Advisory (ICSA-20-287-06)
## Siemens SIPORT MP
Original release date: October 13, 2020
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* * *
## 1\. EXECUTIVE SUMMARY
* **CVSS v3 8.8**
* **ATTENTION:** Exploitable remotely/low skill level to exploit
* **Vendor:** Siemens
* **Equipment:** SIPORT MP
* **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:
* SIPORT MP: Versions 3.2.1 and prior
### 3.2 VULNERABILITY OVERVIEW
#### 3.2.1 [USE OF CLIENT-SIDE AUTHENTICATION
CWE-603](https://cwe.mitre.org/data/definitions/603.html)
The affected product has an authentication bypass, which could make it
vulnerable to an attacker impersonating a system user.
[CVE-2020-7591](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)).
### 3.3 BACKGROUND
* **CRITICAL INFRASTRUCTURE SECTORS:** Commercial Facilities
* **COUNTRIES/AREAS DEPLOYED:** Worldwide
* **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](https://support.industry.siemens.com/cs/ww/en/view/109781856)) 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:
* 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](https://new.siemens.com/global/en/products/services/cert.html#SecurityPublications)
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:
* Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](https://www.us-cert.gov/ics/alerts/ICS-ALERT-10-301-01).
* Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
* 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](https://www.us-cert.gov/ics/recommended-practices) on the ICS
webpage on [us-cert.gov](https://www.us-cert.gov/ics). Several recommended
practices are available for reading and download, including [Improving
Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies](https://www.us-
cert.gov/sites/default/files/recommended_practices/NCCIC_ICS-
CERT_Defense_in_Depth_2016_S508C.pdf).
Additional mitigation guidance and recommended practices are publicly
available on the [ICS webpage on us-cert.gov](https://www.us-cert.gov/ics) in
the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion
Detection and Mitigation Strategies](https://www.us-cert.gov/ics/tips/ICS-
TIP-12-146-01B).
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.
Unavailable Comments