Operating System:

[Win]

Published:

15 September 2021

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3108
       Advisory (icsa-21-257-08) Siemens Teamcenter Active Workspace
                             15 September 2021

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens Teamcenter Active Workspace
Publisher:         ICS-CERT
Operating System:  Windows
Impact/Access:     Reduced Security -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-40357  

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-257-08

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ICS Advisory (ICSA-21-257-08)

Siemens Teamcenter Active Workspace

Original release date: September 14, 2021

Legal Notice

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"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
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referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For more
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1. EXECUTIVE SUMMARY

  o CVSS v3 4.5
  o ATTENTION: Exploitable remotely/low attack complexity
  o Vendor: Siemens
  o Equipment: Teamcenter Active Workspace
  o Vulnerability: Path Traversal

2. RISK EVALUATION

Successful exploitation of this vulnerability could lead to access control
violations.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Teamcenter Active Workspace, a product lifecycle
management (PLM) system, are affected:

  o Teamcenter Active Workspace v4.3: All versions prior to v4.3.10
  o Teamcenter Active Workspace v5.0: All versions prior to v5.0.8
  o Teamcenter Active Workspace v5.1: All versions prior to v5.1.5
  o Teamcenter Active Workspace v5.2: All versions prior to v5.2.1

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH
TRAVERSAL') CWE-22

A path traversal vulnerability in the application could allow an attacker to
bypass certain restrictions, such as direct access, to access other services
within the host.

CVE-2021-40357 has been assigned to this vulnerability. A CVSS v3 base score of
4.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:R/S:U/
C:H/I:N/A:N ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported this vulnerability to CISA.

4. MITIGATIONS

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

  o Teamcenter Active Workspace v4.3: Update to v4.3.10 or later version (login
    required)
  o Teamcenter Active Workspace v5.0: Update to v5.0.8 or later version (login
    required)
  o Teamcenter Active Workspace v5.1: Update to v5.1.5 or later version (login
    required)
  o Teamcenter Active Workspace v5.2: Update to v5.2.1 or later version (login
    required)
  o Harden the application host to prevent local access by untrusted personnel.

As a general security measure, Siemens strongly recommends protecting 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 the Siemens operational guidelines for 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

For more information about this issue, please see Siemens Security Advisory
SSA-413407

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:

  o Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet .
  o Locate control system networks and remote devices behind firewalls, and
    isolate them from the business network.
  o When remote access is required, use secure methods, such as Virtual Private
    Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
    updated to the most current version available. Also recognize VPN is only
    as secure as its connected devices.

CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .

Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.

No known public exploits specifically target this vulnerability.

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.

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