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# SSA-536315: Privilege escalation vulnerability in DIGSI 4

Publication Date:        2021-02-09
Last Update:             2021-02-09
Current Version:         1.0
CVSS v3.1 Base Score:    7.8

SUMMARY
=======

A vertical privilege escalation vulnerability exists in DIGSI 4.

Siemens has released an update for DIGSI 4 and recommends to update to
the latest version.


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


* DIGSI 4 
  - Affected versions:
       All versions < V4.94 SP1 HF 1
  - Remediation:
       Update to V4.94 SP1 HF 1 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109740982/


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

DIGSI 4 is the operation and configuration software for SIPROTEC 4 and
SIPROTEC Compact protection devices.

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-2020-25245

  Several folders in the %PATH% are writeable by normal users. As these
  folders are included in the search for dlls, an attacker could place
  dlls there with code executed by SYSTEM.

  CVSS v3.1 Base Score: 7.8
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-276: Incorrect Default Permissions


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

Siemens thanks the following parties for their efforts:

   * Richard Davy from ECSC Group for coordinated disclosure



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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