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# SSA-756744: OS Command Injection Vulnerability in SINEC NMS

Publication Date:        2021-08-10
Last Update:             2021-09-14
Current Version:         1.1
CVSS v3.1 Base Score:    7.2

SUMMARY
=======

The latest update for SINEC NMS fixes a vulnerability that could allow
an authenticated remote attacker to execute arbitrary code on the
system, with system privileges, under certain conditions.

Siemens has released an update for SINEC NMS and recommends to update to
the latest version.


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


* SINEC NMS 
  - Affected versions:
       All versions < V1.0 SP2
  - Remediation:
       Update to V1.0 SP2 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109797645/


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


Siemens has not identified any additional specific workarounds or mitigations.
Please follow the "General Security Recommendations".

Product specific mitigations can be found in the section "Affected Products and Solution".

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

As a general security measure, Siemens strongly recommends to protect
network access to devices with appropriate mechanisms. In order to
operate the devices in a protected IT environment, Siemens recommends to
configure the environment according to Siemens' operational guidelines
for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security),
and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found
at: https://www.siemens.com/industrialsecurity

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

SINEC NMS is a new generation of the Network Management System (NMS) for
the Digital Enterprise. This system can be used to centrally monitor,
manage, and configure networks.

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-2021-33721

  The affected application incorrectly neutralizes special elements when
  creating batch operations which could lead to command injection.
  
  An authenticated remote attacker with administrative privileges could
  exploit this vulnerability to execute arbitrary code on the system with
  system privileges.

  CVSS v3.1 Base Score: 7.2
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS
Command Injection')


ACKNOWLEDGMENTS
===============

Siemens thanks the following parties for their efforts:

   * Noam Moshe from Claroty for coordinated disclosure



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 (2021-08-10): Publication Date
V1.1 (2021-09-14): Updated acknowledgements

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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