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# SSA-337210: Privilege Escalation Vulnerability in SINUMERIK MC

Publication Date:        2022-03-08
Last Update:             2022-03-08
Current Version:         1.0
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

The NC plug-in card in SINUMERIK MC contains a privilege escalation
vulnerability that could allow local attackers to escalate their
privileges to root. This allows full access to the device, including
read and modifying G code.

Siemens has released updates for the affected products and recommends to
update to the latest versions.


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


* SINUMERIK MC
  - Affected versions:
       All versions < V1.15 SP1
  - Remediation:
       Update to V1.15 SP1 or laterj version
  - Download:
       SINUMERIK software can be obtained from your local Siemens account
       manager.

* SINUMERIK ONE
  - Affected versions:
       All versions < V6.15 SP1
  - Remediation:
       Update to V6.15 SP1 or later version
  - Download:
       SINUMERIK software can be obtained from your local Siemens account
       manager.


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
===================

SINUMERIK MC is a CNC system for customized machine solutions.

SINUMERIK ONE is a digital-native CNC system.

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-2022-24408

  The sc SUID binary on affected devices provides several commands that
  are used to execute system commands or modify system files.
  
  A specific set of operations using sc could allow local attackers to
  escalate their privileges to root.

  CVSS v3.1 Base Score: 7.8
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-269: Improper Privilege Management




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 (2022-03-08): 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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