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# SSA-158827: Denial-of-Service Vulnerability in Automation License Manager

Publication Date:        2021-08-10
Last Update:             2021-08-10
Current Version:         1.0
CVSS v3.1 Base Score:    5.9

SUMMARY
=======

A vulnerability was identified in the Automation License Manager
software that could be triggered by sending specially crafted packets to
port 4410/tcp of an affected system. This could cause a
denial-of-service preventing legitimate users from using the system.

Siemens has released an update for the Automation License Manager 6 and
recommends to update to the latest version. Siemens recommends specific
countermeasures for products where updates are not, or not yet
available.


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


* Automation License Manager 5 
  - Affected versions:
       All versions
  - Remediation:
       See recommendations from section "Workarounds and Mitigations"

* Automation License Manager 6 
  - Affected versions:
       All versions < V6.0 SP9 Update 2
  - Remediation:
       Update to V6.0 SP9 Update 2 or later
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/114358/


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

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

* On the Automation License Manager settings menu disable "Allow Remote
Connections"

* If remote connections are needed, limit remote access to port 4410/tcp
to trusted systems only



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

The Automation License Manager (ALM) centrally manages license keys for
various Siemens software products. Software products requiring license
keys automatically report this requirement to the ALM. When the ALM
finds a valid license key for this software, the software can be used in
conformity with the end user license agreement.

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-2021-25659

  Sending specially crafted packets to port 4410/tcp of an affected system
  could lead to extensive memory being consumed and as such could cause a
  denial-of-service preventing legitimate users from using the system.

  CVSS v3.1 Base Score: 5.9
  CVSS Vector:          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
  CWE:                  CWE-400: Uncontrolled Resource Consumption




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 (2021-08-10): 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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