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# SSA-173318: Unquoted Search Path Vulnerability in SICAM PQ Analyzer

Publication Date:        2022-01-11
Last Update:             2022-01-11
Current Version:         1.0
CVSS v3.1 Base Score:    3.4

SUMMARY
=======

SICAM PQ Analyzer uses an unquoted registry entry and is thus vulnerable
to an unquoted search path vulnerability.

Siemens has released an update for the SICAM PQ Analyzer and recommends
to update to the latest version.


AFFECTED PRODUCTS AND SOLUTION
==============================


* SICAM PQ Analyzer
  - Affected versions:
       All versions < V3.18
  - Remediation:
       Update to V3.18 or later version
       See further recommendations from section "Workarounds and Mitigations"
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109804322


WORKAROUNDS AND MITIGATIONS
===========================

Siemens has identified the following specific workarounds and mitigations that
customers can apply to reduce the risk:

* Make sure these executables do not exist, cannot be created or cannot be
executed (e.g. by Group Policy Software Restriction):

- -   C:\Program.*
- -   C:\Program Files.*
- -   C:\Program Files (x86)\Siemens.*
- -   C:\Program Files (x86)\Siemens Energy\SICAM\PQ.*

Please note that blocking of e.g. "C:\Program.exe" is not sufficient, as
the attacker might be able to plant "C:\Program.com", "C:\Program.msi"
or an executable with any other extension there.



GENERAL SECURITY RECOMMENDATIONS
================================

Operators of critical power systems (e.g. TSOs or DSOs) worldwide are
usually required by regulations to build resilience into the power grids
by applying multi-level redundant secondary protection schemes. It is
therefore recommended that the operators check whether appropriate
resilient protection measures are in place. The risk of cyber incidents
impacting the grid's reliability can thus be minimized by virtue of the
grid design.

Siemens strongly recommends applying the provided security updates using
the corresponding tooling and documented procedures made available with
the product. If supported by the product, an automated means to apply
the security updates across multiple product instances may be used.
Siemens strongly recommends prior validation of any security update
before being applied, and supervision by trained staff of the update
process in the target environment.

As a general security measure Siemens strongly recommends to protect
network access with appropriate mechanisms (e.g. firewalls,
segmentation, VPN). It is advised to configure the environment according
to our operational guidelines in order to run the devices in a protected
IT environment.

Recommended security guidelines to Digital Grid Products can be found
at:

https://www.siemens.com/gridsecurity

PRODUCT DESCRIPTION
===================

SICAM PQ Analyzer is a power quality system software that provides
options to evaluate archived PQ measuring data and fault records.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2021-45460

  A service is started by an unquoted registry entry. As there are spaces
  in this path, attackers with write privilege to those directories might
  be able to plant executables that will run in place of the legitimate
  process.
  
  Attackers might achieve persistence on the system ("backdoors") or cause
  a denial of service.

  CVSS v3.1 Base Score: 3.4
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L/E:P/RL:O/RC:C
  CWE:                  CWE-428: Unquoted Search Path or Element




ADDITIONAL INFORMATION
======================

For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT:

https://www.siemens.com/cert/advisories


HISTORY DATA
============

V1.0 (2022-01-11): Publication Date

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.
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