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# SSA-292794: Multiple Denial-of-Service Vulnerabilities in SINEMA Remote Connect
Server

Publication Date:        2021-04-13
Last Update:             2021-04-13
Current Version:         1.0
CVSS v3.1 Base Score:    7.5

SUMMARY
=======

The latest update for SINEMA Remote Connect Server fixes two
Denial-of-Service vulnerabilities in the underlying third-party XML
parser.

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


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


* SINEMA Remote Connect Server 
  - Affected versions:
       All versions < V3.0
  - Remediation:
       Update to V3.0
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109793790


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


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


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 Remote Connect ensures management of secure connections (VPN)
between headquarters, service technicians and the installed machines or
plants.

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-2019-19956

  xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10
  has a memory leak related to newDoc->oldNs.

  CVSS v3.1 Base Score: 7.5
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
  CWE:                  CWE-772: Missing Release of Resource after Effective Lifetime

* Vulnerability CVE-2020-7595

  xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite
  loop in a certain end-of-file situation.

  CVSS v3.1 Base Score: 7.5
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
  CWE:                  CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')




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 (2021-04-13): 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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