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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3874
                     Advisory (icsa) Siemens Products
                             12 November 2021

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

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

Product:           SENTRON powermanager
                   Climatix POL909
                   NX OBJ Translator
                   Nucleus RTOS-based APOGEE and TALON Products
                   SCALANCE W1750D
                   Mendix Studio Pro
                   Mendix
                   SIMATIC WinCC
Publisher:         ICS-CERT
Operating System:  Network Appliance
                   Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated      
                   Increased Privileges            -- Existing Account            
                   Modify Arbitrary Files          -- Remote with User Interaction
                   Denial of Service               -- Remote/Unauthenticated      
                   Access Confidential Data        -- Remote/Unauthenticated      
                   Provide Misleading Information  -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-42026 CVE-2021-42025 CVE-2021-42015
                   CVE-2021-41538 CVE-2021-41535 CVE-2021-40366
                   CVE-2021-40364 CVE-2021-40359 CVE-2021-40358
                   CVE-2021-37735 CVE-2021-37734 CVE-2021-37732
                   CVE-2021-37730 CVE-2021-37727 CVE-2021-37726
                   CVE-2021-37207 CVE-2021-31890 CVE-2021-31889
                   CVE-2021-31888 CVE-2021-31887 CVE-2021-31886
                   CVE-2021-31885 CVE-2021-31884 CVE-2021-31883
                   CVE-2021-31882 CVE-2021-31881 CVE-2021-31346
                   CVE-2021-31345 CVE-2021-31344 

Reference:         ESB-2021.3833
                   ESB-2021.3454

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-10
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-09
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-08
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-07
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-06
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-05
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-04
   https://us-cert.cisa.gov/ics/advisories/icsa-21-315-03

Comment: This bulletin contains eight (8) ICS-CERT security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

ICS Advisory (ICSA-21-315-10)

Siemens SENTRON powermanager

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.8
  o ATTENTION: Low attack complexity
  o Vendor: Siemens
  o Equipment: SENTRON powermanager
  o Vulnerability: Incorrect Permission Assignment for Critical Resource

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow an authenticated
local attacker to inject arbitrary code and escalate privileges.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Siemens SENTRON powermanager, a power monitoring
software to analyze energy consumption, are affected:

  o SENTRON powermanager Version 3: All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE CWE-732

The affected application assigns improper access rights to a specific folder
containing configuration files.

CVE-2021-37207 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:H ).

3.3 BACKGROUND

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

3.4 RESEARCHER

Noam Moshe of Claroty reported this vulnerability to Siemens.

4. MITIGATIONS

Siemens has released a security patch for SENTRON powermanager v3.6 HF1 and
recommends updating to the latest version.

Siemens recommends users also harden the application server 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 configuring the environment
according to 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 and the mitigations, please see Siemens
security advisory SSA-537983

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

  o Ensure the least-privilege user principle is followed.

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. This
vulnerability is not exploitable remotely.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-09)

Siemens Climatix POL909

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 6.4
  o ATTENTION: Exploitable remotely
  o Vendor: Siemens
  o Equipment: Climatix POL909 (AWM module)
  o Vulnerability: Missing Encryption of Sensitive Data

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow sensitive data
disclosure or modification of data in transit.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Climatix POL909 (AWM module), an advanced web module,
are affected:

  o Climatix POL909 (AWM module): All versions prior to v11.34

3.2 VULNERABILITY OVERVIEW

3.2.1 MISSING ENCRYPTION OF SENSITIVE DATA CWE-311

The web server of affected devices transmits data without TLS encryption. This
could allow an unauthenticated remote attacker in a man-in-the-middle position
to read sensitive data, such as administrator credentials, or modify data in
transit.

CVE-2021-40366 has been assigned to this vulnerability. A CVSS v3 base score of
6.4 has been assigned; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:R/S:U/C:H/
I:L/A:L ).

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 recommends users update to v11.34 or later version.

Siemens has not identified any additional specific workarounds or mitigations.

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 configuring the environment
according to Siemens' operational guidelines for industrial security , and
follow the recommendations in the product manuals.

Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/industrialsecurity

For additional information, please refer to Siemens Security Advisory
SSA-703715

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 that VPNs may have vulnerabilities and should
    be updated to the most current version available. Also recognize that VPN
    is only as secure as the 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. This
vulnerability has a high attack complexity.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-08)

Siemens NX OBJ Translator

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.8
  o ATTENTION: low attack complexity
  o Vendor: Siemens
  o Equipment: NX
  o Vulnerabilities: Use After Free, Access of Uninitialized Pointer

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could lead to an access
violation and arbitrary code execution on the target system.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports these vulnerabilities affects the following NX products:

  o NX 1953 Series: All versions prior to v1973.3700
  o NX 1980 Series: All versions prior to v1988

3.2 VULNERABILITY OVERVIEW

3.2.1 USE AFTER FREE CWE-416

The affected application contains a use-after-free vulnerability while parsing
OBJ files. An attacker could leverage this vulnerability to execute code in the
context of the current process.

CVE-2021-41535 has been assigned to this vulnerability. A CVSS v3 base score of
7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:H/I:H/A:H ).

3.2.2 ACCESS OF UNINITIALIZED POINTER CWE-824

The affected application is vulnerable to information disclosure by unexpected
access to an uninitialized pointer while parsing user-supplied OBJ files. An
attacker could leverage this vulnerability to leak information from memory
locations.

CVE-2021-41538 has been assigned to this vulnerability. A CVSS v3 base score of
3.3 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/
C:L/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

xina1i working, with Trend Micro's Zero Day Initiative, reported these
vulnerabilities to Siemens and CISA.

4. MITIGATIONS

Siemens has released updates for the NX and recommends updating to the latest
version.

  o NX 1953 Series: Update to v1973.3700 or later version
  o NX 1980 Series: Update to v1988 or later version

Siemens recommends users avoid opening of untrusted files from unknown sources.

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 configuring the environment
according to Siemens' operational guidelines for industrial security and
following the recommendations in the product manuals.

For more information about this issue, please see Siemens security advisory
SSA-328042

CISA also recommends users take the following measures to protect themselves
from social engineering attacks:

  o Do not click web links or open unsolicited attachments in email messages.
  o Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
  o Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

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 these vulnerabilities. These
vulnerabilities are not exploitable remotely.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-07)

Siemens Nucleus RTOS-based APOGEE and TALON Products

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 9.8
  o ATTENTION: Exploitable remotely/low attack complexity
  o Vendor: Siemens
  o Equipment: Nucleus RTOS based APOGEE and TALON Products
  o Vulnerabilities: Type Confusion, Improper Validation of Specified Quantity
    in Input, Out-of-bounds Read, Improper Restriction of Operations within the
    Bounds of a Memory Buffer, Improper Null Termination, Buffer Access with
    Incorrect Length Value, Integer Underflow, Improper Handling of
    Inconsistent Structural Elements

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow denial-of-service
conditions, remote code execution, information leaks, and out-of-bounds reads
and writes.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following Nucleus RTOS based APOGEE and TALON Products, direct digital
control (DDC) devices, are affected:

  o APOGEE MBC (PPC) (BACnet): All versions
  o APOGEE MBC (PPC) (P2 Ethernet): All versions
  o APOGEE MEC (PPC) (BACnet): All versions
  o APOGEE MEC (PPC) (P2 Ethernet): All versions
  o APOGEE PXC Compact (BACnet): All versions
  o APOGEE PXC Compact (P2 Ethernet): All versions
  o APOGEE PXC Modular (BACnet): All versions
  o APOGEE PXC Modular (P2 Ethernet): All versions
  o TALON TC Compact (BACnet): All versions
  o TALON TC Modular (BACnet): All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 ACCESS OF RESOURCE USING INCOMPATIBLE TYPE ('TYPE CONFUSION') CWE-843

ICMP echo packets with fake IP options allow sending ICMP echo reply messages
to arbitrary hosts on the network.

CVE-2021-31344 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:L/A:N ).

3.2.2 IMPROPER VALIDATION OF SPECIFIED QUANTITY IN INPUT CWE-1284

The total length of an UDP payload (set in the IP header) is unchecked. This
may lead to various side effects, including information leaks, depending on a
user-defined application that runs on top of the UDP protocol.

CVE-2021-31345 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:N/A:N ).

3.2.3 IMPROPER VALIDATION OF SPECIFIED QUANTITY IN INPUT CWE-1284

The total length of an ICMP payload (set in the IP header) is unchecked. This
may lead to various side effects, including information leaks and
denial-of-service conditions, depending on the network buffer organization in
memory.

CVE-2021-31346 has been assigned to this vulnerability. A CVSS v3 base score of
8.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:L/
I:N/A:H ).

3.2.4 OUT-OF-BOUNDS READ CWE-125

When processing a DHCP OFFER message, the DHCP client application does not
validate the length of the Vendor option(s), leading to denial-of-service
conditions.

CVE-2021-31881 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:L/
I:N/A:H ).

3.2.5 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS CWE-119

The DHCP client application does not validate the length of the Domain Name
Server IP option(s) (0x06) when processing DHCP ACK packets. This may lead to
denial-of-service conditions.

CVE-2021-31882 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).

3.2.6 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS CWE-119

When processing a DHCP ACK message, the DHCP client application does not
validate the length of the Vendor option(s), leading to denial-of-service
conditions.

CVE-2021-31883 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:L/
I:N/A:H ).

3.2.7 IMPROPER NULL TERMINATION CWE-170

The DHCP client application assumes the data supplied with the "Hostname" DHCP
option is NULL terminated. In cases when global hostname variable is not
defined, this may lead to out-of-bound reads, writes, and denial-of-service
conditions.

CVE-2021-31884 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.8 BUFFER ACCESS WITH INCORRECT LENGTH VALUE CWE-805

TFTP server application allows for reading the contents of the TFTP memory
buffer via sending malformed TFTP commands.

CVE-2021-31885 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:N/A:N ).

3.2.9 IMPROPER NULL TERMINATION CWE-170

FTP server does not properly validate the length of the "USER" command, leading
to stack-based buffer overflows. This may result in denial-of-service
conditions and remote code execution.

CVE-2021-31886 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.10 IMPROPER NULL TERMINATION CWE-170

FTP server does not properly validate the length of the "PWD/XPWD" command,
leading to stack-based buffer overflows. This may result in denial-of-service
conditions and remote code execution.

CVE-2021-31887 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.11 IMPROPER NULL TERMINATION CWE-170

FTP server does not properly validate the length of the "MKD/XMKD" command,
leading to stack-based buffer overflows. This may result in denial-of-service
conditions and remote code execution.

CVE-2021-31888 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.12 INTEGER UNDERFLOW (WRAP OR WRAPAROUND) CWE-191

Malformed TCP packets with a corrupted SACK option leads to denial-of-service
conditions.

CVE-2021-31889 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).

3.2.13 IMPROPER HANDLING OF INCONSISTENT STRUCTURAL ELEMENTS CWE-240

The total length of an TCP payload (set in the IP header) is unchecked. This
may lead to various side effects, including denial-of-service conditions,
depending on the network buffer organization in memory.

CVE-2021-31890 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/
I:N/A:H ).

3.3 BACKGROUND

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

3.4 RESEARCHER

Siemens reported these vulnerabilities to CISA.

4. MITIGATIONS

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

  o Restrict system access to authorized personnel and follow a least privilege
    approach.
  o Disable the DHCP client and use static IP address configuration instead.
  o Protect network access to the affected devices with appropriate measures,
    (e.g., firewalls) to reduce the risk.
  o Disable FTP on all devices.
  o Apply appropriate strategies for mitigation on the network level to ensure
    affected devices are as segmented.
  o Ensure default passwords are changed.
  o Implement defense in depth concepts to mitigate risk of an attacker gaining
    access to affected devices and networks.
  o Contact a Siemens office for support.

As a general security measure Siemens strongly recommends protecting network
access to affected products with appropriate mechanisms. It is advised to
follow recommended security practices to run the devices in a protected IT
environment.
For more information see Siemens Security Advisory SSA-114589

CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 these vulnerabilities.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-06)

Siemens SCALANCE W1750D

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 9.8
  o ATTENTION: Exploitable remotely/low attack complexity
  o Vendor: Siemens
  o Equipment: SCALANCE W1750D
  o Vulnerabilities: Improper Restriction of Operations Within the Bounds of a
    Memory Buffer, Command Injection, Path Traversal

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow an attacker to
execute code on the affected devices, read arbitrary files, or create a
denial-of-service condition.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of SCALANCE W1750D, a wireless access point, are
affected:

  o SCALANCE W1750D: All versions prior to v8.7.1.3
  o SCALANCE W1750D: Versions 8.7.1.3 and newer (only affected by
    CVE-2021-37727, CVE-2021-37730, and CVE-2021-37734)

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER
CWE-119

A remote buffer overflow vulnerability was discovered in HPE Aruba Instant
(IAP). Successful exploitation could allow for unauthenticated remote code
execution, potentially resulting in the execution of arbitrary code as a
privileged user on the underlying system.

CVE-2021-37726 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:H/
I:H/A:H ).

3.2.2 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND
INJECTION') CWE-77

A remote arbitrary command execution vulnerability was discovered in HPE Aruba
Instant (IAP) command line interface. Successful exploitation could result in
the ability to execute arbitrary commands as a privileged user on the
underlying OS, potentially compromising the system.

CVE-2021-37727 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).

3.2.3 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND
INJECTION') CWE-77

A remote arbitrary command execution vulnerability was discovered in HPE Aruba
Instant (IAP) command line interface. Successful exploitation could result in
the ability to execute arbitrary commands as a privileged user on the
underlying OS, potentially compromising the system.

CVE-2021-37730 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).

3.2.4 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN A COMMAND ('COMMAND
INJECTION') CWE-77

A remote arbitrary command execution vulnerability was discovered in HPE Aruba
Instant (IAP) web-based management user interface. Successful exploitation
could result in the ability to execute arbitrary commands as a privileged user
on the underlying OS, potentially compromising the system.

CVE-2021-37732 has been assigned to this vulnerability. A CVSS v3 base score of
7.2 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:H/A:H ).

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

An authenticated arbitrary file read access vulnerability was discovered in
Aruba Instant Access Points. Successful exploitation could lead to an attacker
reading any file off the underlying filesystem, including system sensitive
files.

CVE-2021-37734 has been assigned to this vulnerability. A CVSS v3 base score of
4.9 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:H/
I:N/A:N ).

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

A remote denial of service vulnerability was discovered in Aruba Instant
through the command line interface. Successful exploitation could create a
denial-of-service condition, leading to a temporary loss of service until the
next reboot.

CVE-2021-37735 has been assigned to this vulnerability. A CVSS v3 base score of
4.9 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/C:N/
I:N/A:H ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported these vulnerabilities to CISA.

4. MITIGATIONS

Siemens recommends upgrading their products to the latest version:

  o SCALANCE W1750D: Update to v8.7.1.3 or later.

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

  o Block access to the Aruba Instant Command Line Interface from all untrusted
    users.
  o Block access to the Aruba Instant web-based management interface from all
    untrusted users.
  o Enable the Enhanced PAPI Security feature, where available, to prevent
    exploitation of these vulnerabilities. For assistance from the Siemens
    Technical Assistance Center (TAC), please contact Siemens (login required).
  o Block access for Aruba Instant device on Port UDP/8211 from all untrusted
    users.

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 configuring the environment
according to the Siemens operational guidelines for Industrial Security and
following the recommendations in the product manuals.

For additional information, please refer to Siemens Security Advisory
SSA-917476

CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 these vulnerabilities.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-05)

Siemens Mendix Studio Pro

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 5.3
  o ATTENTION: Exploitable remotely
  o Vendor: Siemens
  o Equipment: Mendix Studio Pro
  o Vulnerabilities: Incorrect Authorization

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow authenticated
attackers to manipulate the content of specific objects or to retrieve a
specific attribute of arbitrary objects.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports these vulnerabilities affect the following Mendix products:

  o Mendix Applications using Mendix 8: All versions prior to v8.18.13
  o Mendix Applications using Mendix 9: All versions prior to v9.6.2

3.2 VULNERABILITY OVERVIEW

3.2.1 INCORRECT AUTHORIZATION CWE-863

Applications built with affected versions of Mendix Studio Pro do not properly
control write access for certain client actions. This could allow authenticated
attackers to manipulate the content of specific objects regardless of whether
they have write access.

CVE-2021-42025 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/
C:N/I:H/A:N ).

3.2.2 INCORRECT AUTHORIZATION CWE-863

Applications built with affected versions of Mendix Studio Pro do not properly
control read access for certain client actions. This could allow authenticated
attackers to retrieve specific attributes of arbitrary objects, regardless of
whether they have read access.

CVE-2021-42026 has been assigned to this vulnerability. A CVSS v3 base score of
3.1 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:L/UI:N/S:U/
C:L/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 these vulnerabilities to CISA.

4. MITIGATIONS

Mendix has released updates for the affected product lines and recommends
updating to the latest versions and redeploying the applications.

  o Mendix Applications using Mendix 8: Update to v8.18.13 or later version and
    redeploy the application.
  o Mendix Applications using Mendix 9: Update to v9.6.2 or v9.7.0 or later
    version and redeploy the application.

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

  o In applications built with affected versions of Mendix Studio Pro, avoid
    using file documents that contain sensitive information.

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 configuring the environment
according to Siemens' operational guidelines for Industrial Security , and
following the recommendations in the product manuals.

For more information about these vulnerabilities, please see Siemens security
advisory SSA-779699

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

  o Ensure the least-privilege user principle is followed.
  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 these vulnerabilities. These
vulnerabilities have a high attack complexity.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-04)

Siemens Mendix

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 4.0
  o ATTENTION: Low attack complexity
  o Vendor: Siemens
  o Equipment: Mendix
  o Vulnerability: Use of Web Browser Cache Containing Sensitive Information

2. RISK EVALUATION

Successful exploitation of this vulnerability could allow a local attacker to
read cached documents by exploring the browser cache.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following versions of Mendix, an application platform, are affected:

  o Mendix Applications using Mendix 7: All versions prior to v7.23.26
  o Mendix Applications using Mendix 8: All versions prior to v8.18.12
  o Mendix Applications using Mendix 9: All versions prior to v9.6.1

3.2 VULNERABILITY OVERVIEW

3.2.1 USE OF WEB BROWSER CACHE CONTAINING SENSITIVE INFORMATION CWE-525

Applications built with the affected versions of Mendix Studio Pro do not
prevent file documents from being cached when files are opened or downloaded
using a browser. This could allow a local attacker to read documents by
exploring the browser cache.

CVE-2021-42015 has been assigned to this vulnerability. A CVSS v3 base score of
4.0 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:N/S:U/C:L/
I:N/A:N ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Casix reported this vulnerability to Siemens.

4. MITIGATIONS

Siemens recommends upgrading to the latest version of Mendix:

  o Mendix Applications using Mendix 7: Update to v7.23.26 or later
  o Mendix Applications using Mendix 8: Update to v8.18.12 or later
  o Mendix Applications using Mendix 9: Update to v9.6.1 or v9.7.0 or later

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

  o Applications built with affected versions of Mendix Studio Pro: avoid using
    file documents that contain sensitive information

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 configuring the environment
according to the Siemens operational guidelines for Industrial Security and
following the recommendations in the product manuals.

For additional information, please refer to Siemens Security Advisory
SSA-338732

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. This
vulnerability is not exploitable remotely.

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.


- --------------------------------------------------------------------------------


ICS Advisory (ICSA-21-315-03)

Siemens SIMATIC WinCC

Original release date: November 11, 2021

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
contained within. DHS does not endorse any commercial product or service,
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
information about TLP, see https://us-cert.cisa.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 9.9
  o ATTENTION: Exploitable remotely/low attack complexity
  o Vendor: Siemens
  o Equipment: SIMATIC WinCC
  o Vulnerabilities: Path Traversal, Insertion of Sensitive Information into
    Log File

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow local attackers to
escalate privileges, and read, write, or delete critical files.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports these vulnerabilities affects the following SIMATIC SCADA HMI
system products:

  o SIMATIC PCS 7 v8.2 and earlier: All versions
  o SIMATIC PCS 7 v9.0: All versions
  o SIMATIC PCS 7 v9.1: All versions
  o SIMATIC WinCC v7.4 and earlier: All versions
  o SIMATIC WinCC v7.5: All versions prior to v7.5 SP2 Update 5
  o SIMATIC WinCC v15 and earlier: All versions
  o SIMATIC WinCC v16: All versions
  o SIMATIC WinCC v17: All versions

3.2 VULNERABILITY OVERVIEW

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

Legitimate file operations of the affected systems do not properly neutralize
special elements within the pathname. An attacker could cause the pathname to
resolve to a location outside of the restricted directory on the server and
read, write, or delete critical files.

CVE-2021-40358 has been assigned to this vulnerability. A CVSS v3 base score of
9.9 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
C:H/I:H/A:H ).

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

When downloading files, the affected systems do not properly neutralize special
elements within the pathname. An attacker could cause the pathname to resolve
to a location outside of the restricted directory on the server and read
critical files.

CVE-2021-40359 has been assigned to this vulnerability. A CVSS v3 base score of
7.7 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/
C:H/I:N/A:N ).

3.2.3 INSERTION OF SENSITIVE INFORMATION INTO LOG FILE CWE-532

The affected systems store sensitive information in log files. An attacker with
access to the log files could publicly expose the information or reuse it to
develop further attacks.

CVE-2021-40364 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/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

Thomas Riedmaier from Siemens Energy reported these vulnerabilities to Siemens.

4. MITIGATIONS

Siemens has released updates for several affected products and recommends
updating to the latest versions. Siemens is preparing further updates and
recommends specific countermeasures for products where updates are not, or not
yet available.

  o SIMATIC PCS 7 v9.1: Install v7.5 SP2 Update 5 or later version

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

  o Harden the application's 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 configuring the environment
according to Siemens' operational guidelines for Industrial Security , and
follow the recommendations in the product manuals.

For more information about this issue, please see Siemens security advisory
SSA-840188

CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 these vulnerabilities.

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.

- --------------------------END INCLUDED TEXT--------------------

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