Protect yourself against future threats.
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2024.2266
ICS Advisory | ICSA-24-102-05 Siemens Scalance W1750D
12 April 2024
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Scalance W1750D
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-35980 CVE-2023-35981 CVE-2023-35982
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-24-102-05
Comment: CVSS (Max): 9.8 CVE-2023-35982 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- --------------------------BEGIN INCLUDED TEXT--------------------
ICS Advisory (ICSA-24-102-05)
Siemens Scalance W1750D
Release Date
April 11, 2024
As of January 10, 2023, CISA will no longer be updating ICS security advisories
for Siemens product vulnerabilities beyond the initial advisory. For the most
up-to-date information on vulnerabilities in this advisory, please see Siemens'
ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION : Exploitable remotely/low attack complexity
o Vendor : Siemens
o Equipment : Scalance W1750D
o Vulnerabilities : Classic Buffer Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
exploit buffer overflow and information disclosure vulnerabilities which could
lead to information disclosure or unauthenticated remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products of Siemens Scalance W1750D, a direct access point, are
affected:
o Siemens SCALANCE W1750D (JP) (6GK5750-2HX01-1AD0): All versions prior to
V8.10.0.9
o Siemens SCALANCE W1750D (ROW) (6GK5750-2HX01-1AA0): All versions prior to
V8.10.0.9
o Siemens SCALANCE W1750D (USA) (6GK5750-2HX01-1AB0): All versions prior to
V8.10.0.9
3.2 Vulnerability Overview
3.2.1 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
There are buffer overflow vulnerabilities in multiple underlying services that
could lead to unauthenticated remote code execution by sending specially
crafted packets destined to the PAPI (Aruba's access point management protocol)
UDP port (8211). Successful exploitation of these vulnerabilities results in
the ability to execute arbitrary code as a privileged user on the underlying
operating system.
CVE-2023-35980 has been assigned to this vulnerability. A CVSS v3.1 base score
of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U
/C:H/I:H/A:H ).
3.2.2 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
There are buffer overflow vulnerabilities in multiple underlying services that
could lead to unauthenticated remote code execution by sending specially
crafted packets destined to the PAPI (Aruba's access point management protocol)
UDP port (8211). Successful exploitation of these vulnerabilities results in
the ability to execute arbitrary code as a privileged user on the underlying
operating system.
CVE-2023-35981 has been assigned to this vulnerability. A CVSS v3.1 base score
of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U
/C:H/I:H/A:H ).
3.2.3 BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW')
CWE-120
There are buffer overflow vulnerabilities in multiple underlying services that
could lead to unauthenticated remote code execution by sending specially
crafted packets destined to the PAPI (Aruba's access point management protocol)
UDP port (8211). Successful exploitation of these vulnerabilities results in
the ability to execute arbitrary code as a privileged user on the underlying
operating system.
CVE-2023-35982 has been assigned to this vulnerability. A CVSS v3.1 base score
of 9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/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
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce risk:
o Update to V8.10.0.9 or later version. The update is available upon request
from customer support
o The CLI and web-based management interfaces should be restricted to a
dedicated layer 2 segment/VLAN and/or controlled by firewall policies at
layer 3 and above
o Enabling cluster-security via the cluster-security command will prevent the
vulnerabilities from being exploited
As a general security measure, Siemens recommends protecting network access to
devices with appropriate mechanisms. To operate the devices in a protected IT
environment, Siemens recommends configuring the environment according to
Siemens' operational guidelines for industrial security and following
recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the
Siemens industrial security webpage .
For more information see the associated Siemens security advisory SSA-885980 in
HTML and CSAF .
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities, such as:
o Minimize network exposure for all control system devices and/or systems,
ensuring they are not accessible from the internet .
o Locate control system networks and remote devices behind firewalls and
isolating them from business networks.
o When remote access is required, use more 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 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 cisa.gov/ics . Several CISA products detailing cyber
defense best practices are available for reading and download, including
Improving Industrial Control Systems Cybersecurity with Defense-in-Depth
Strategies .
CISA encourages organizations to implement recommended cybersecurity strategies
for proactive defense of ICS assets .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
No known public exploitation specifically targeting these vulnerabilities has
been reported to CISA at this time.
5. UPDATE HISTORY
o April 11, 2024: Initial Publication
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Siemens
- --------------------------END INCLUDED TEXT----------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================