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# SSA-931064: Authentication Bypass in SIMATIC Logon

Publication Date:        2017-02-13
Last Update:             2018-06-12
Current Version:         1.4
CVSS v3.0 Base Score:    9.0

SUMMARY
=======

The latest update for SIMATIC Logon fixes a security vulnerability that
could allow attackers to circumvent user authentication under certain
conditions.

SIMATIC WinCC, SIMATIC PCS 7, SIMATIC PDM, and SIMATIC IT Production
Suite provide SIMATIC Logon as component of the product. Installing the
SIMATIC Logon update fixes the vulnerability for all products mentioned
below.


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


* SIMATIC Logon 
  - Affected versions:
       All versions < V1.5 SP3 Update 2
  - Remediation:
       Update to V1.5 SP3 Update 2
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109744966

* SIMATIC WinCC 
  - Affected versions:
       All versions < V7.4 SP1
  - Remediation:
       Install SIMATIC Logon update (can be installed without WinCC update, see
       compatibility note on download page)
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109744966

* SIMATIC WinCC Runtime Professional 
  - Affected versions:
       All versions < V14 SP1
  - Remediation:
       Install SIMATIC Logon update (can be installed without WinCC Runtime
       Professional update, see compatibility note on download page)
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109744966

* SIMATIC PCS 7 
  - Affected versions:
       All versions < V8.2 SP1
  - Remediation:
       Install SIMATIC Logon update (can be installed without PCS 7 update, see
       compatibility note on download page)
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109744966

* SIMATIC PDM 
  - Affected versions:
       All versions < V9.1
  - Remediation:
       Install SIMATIC Logon update (can be installed without PDM update, see
       compatibility note on download page)
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109744966

* SIMATIC IT Production Suite 
  - Affected versions:
       All versions < V7.1
  - Remediation:
       Install SIMATIC Logon update (can be installed without IT Production
       Suite update, see compatibility note on download page)
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109744966


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


Siemens has not identified any specific mitigations or workarounds.


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

SIMATIC Logon (SL) is a software application used for central user
administration and access control in other SIMATIC applications.



VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.0 (CVSS v3.0) (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.


* Vulnerability CVE-2017-2684

  An attacker with knowledge of a valid user name, and physical or network
  access to the affected system could bypass the application-level
  authentication.

  CVSS v3.0 Base Score: 9.0
  CVSS v3.0 Vector:     CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C




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 (2017-02-13): Publication Date
V1.1 (2017-06-13): Added version information of WinCC 7.4 SP1, WinCC Professional V14 SP1
that include a fixed version of SIMATIC Logon
V1.2 (2017-07-06): Added version information SIMATIC PCS 7 and SIMATIC PDM that include a
fixed version of SIMATIC Logon
V1.3 (2017-11-17): Added version information for SIMATIC IT Production Suite
V1.4 (2018-06-12): New format, updated fixed PCS 7 version

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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