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# SSA-880233: Incorrect Session Validation Vulnerability in SINEMA Server

Publication Date:        2020-01-14
Last Update:             2020-01-14
Current Version:         1.0
CVSS v3.1 Base Score:    9.9

SUMMARY
=======

The latest update for SINEMA Server fixes a vulnerability that could
allow authenticated users with a low-privileged account to perform
firmware updates (as well as other administrative operations) on
connected devices. Therefore, Siemens recommends to update the affected
products.


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


* SINEMA Server 
  - Affected versions:
       All versions < V14.0 SP2 Update 1
  - Remediation:
       Update to V14.0 SP2 Update 1
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109773579


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

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

* Restrict network access to device port 443/tcp to trusted IP addresses.
  
* Restrict low-privileged accounts access to trusted persons.
  


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

SINEMA Server is a network 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-2019-10940

  Incorrect session validation could allow an attacker with a valid
  session, with low privileges, to perform firmware updates and other
  administrative operations on connected devices.
  
  The security vulnerability could be exploited by an attacker with
  network access to the affected system. An attacker must have access to a
  low privileged account in order to exploit the vulnerability. An
  attacker could use the vulnerability to compromise confidentiality,
  integrity, and availability of the affected system and underlying
  components.
  
  At the time of advisory publication no public exploitation of this
  security vulnerability was known.

  CVSS v3.1 Base Score: 9.9
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-266: Incorrect Privilege Assignment


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

Siemens thanks the following parties for their efforts:

   * Antonin Rahon from Agilicom for reporting the vulnerability



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 (2020-01-14): 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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