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# SSA-156833: Zip-Slip Directory Traversal Vulnerability in SINEMA Server and SINEC
NMS

Publication Date:        2021-02-09
Last Update:             2021-02-09
Current Version:         1.0
CVSS v3.1 Base Score:    8.8

SUMMARY
=======

There exists a directory traversal vulnerability which allows arbitrary
file upload to an affected system. This type of vulnerability is also
known as 'Zip-Slip'. An authenticated attacker could exploit this
vulnerability to gain arbitrary code execution by uploading a new or
modifying an existing file to an affected system.

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


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


* SINEC NMS 
  - Affected versions:
       All versions < V1.0 SP1 Update 1
  - Remediation:
       Update to V1.0 SP1 Update 1 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109792922/

* SINEMA Server 
  - Affected versions:
       All versions < V14.0 SP2 Update 2
  - Remediation:
       Update to V14.0 SP2 Update 2 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109792920/


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

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

* Restrict access to the affected components to trusted personnel.
  


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.

SINEMA Server is a network monitoring and management software designed
by Siemens for use in Industrial Ethernet 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-2020-25237

  When uploading files to an affected system using a zip container, the
  system does not correctly check if the relative file path of the
  extracted files is still within the intended target directory. With this
  an attacker could create or overwrite arbitrary files on an affected
  system. This type of vulnerability is also known as 'Zip-Slip'.
  (ZDI-CAN-12054)

  CVSS v3.1 Base Score: 8.8
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C
  CWE:                  CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path
Traversal')


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

Siemens thanks the following parties for their efforts:

   * Trend Micro Zero Day Initiative for coordinated disclosure
   * Cybersecurity and Infrastructure Security Agency (CISA) for coordination efforts



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 (2021-02-09): 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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