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AUSCERT External Security Bulletin Redistribution
ESB-2022.4034
Advisory (icsa-22-223-05) Siemens SICAM A8000 Web Server Module
12 August 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SICAM A8000 Web Server Module
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Mitigation
CVE Names: CVE-2021-46304
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-223-05
Comment: CVSS (Max): 4.3 CVE-2021-46304 (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N)
CVSS Source: ICS-CERT
Calculator https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
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ICS Advisory (ICSA-22-223-05)
Siemens SICAM A8000 Web Server Module
Original release date: August 11, 2022
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 4.3
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: SICAM A8000 CP-8000, CP-8021, CP-8022
o Vulnerability: Improper Access Control
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow unauthenticated
access to the web interface of the affected web server.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens has reported that this vulnerability affects the following SICAM A8000
Web Server Module products and versions:
o CP-8000 MASTER MODULE WITH I/O -25/+70C (6MF2101-0AB10-0AA0): All Versions
o CP-8000 MASTER MODULE WITH I/O -40/+70C (6MF2101-1AB10-0AA0): All Versions
o CP-8021 MASTER MODULE (6MF2802-1AA00): All Versions
o CP-8022 MASTER MODULE WITH GPRS (6MF2802-2AA00): All Versions
The affected protocol firmware utilized with the web server modules includes
the following:
o AGPMT0 (AGP Master)
o DNPiT1 (DNP3 TCP/IP Server)
o DNPiT2 (DNP3 TCP/IP Client)
o DNPMT0 (DNP3 Master seriell)
o DNPST0 (DNP3 Slave seriell)
o ET83 (61850 Ed.1)
o ET85 (61850 Ed.2)
o MBCiT0 (MODBUS TCP/IP Client)
o MBSiT0 (MODBUS TCP/IP Server)
o MODMT2 (MODBUS Master seriell)
o OPUPT0 (OPCUA Pub/Sub)
o OPUPT1 (Mindconnect)
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER ACCESS CONTROL - CWE-284
The vulnerability could allow attackers to activate a web server module,
allowing unauthorized access to its web pages. This could allow an attacker to
retrieve debug-level information from the component such as internal network
topology or connected systems.
CVE-2021-46304 has been assigned to this vulnerability. A CVSS v3 base score of
4.3 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:U/C:L/
I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
CybExer Technologies reported this vulnerability to Siemens.
4. MITIGATIONS
Siemens provided the following updates to the vulnerabilities for the following
products affected:
o CP-8000 MASTER MODULE WITH I/O -25/+70C (6MF2101-0AB10-0AA0): There is
currently no fix available
o CP-8000 MASTER MODULE WITH I/O -40/+70C (6MF2101-1AB10-0AA0): There is
currently no fix available
o CP-8021 MASTER MODULE (6MF2802-1AA00): There is currently no fix available
o CP-8022 MASTER MODULE WITH GPRS (6MF2802-2AA00): There is currently no fix
available
Siemens has identified the following workarounds and mitigations for users to
reduce risk:
o Operate the affected web server module only when required and apply the
security instructions provided in the updated manual.
Siemens recommends users apply General Security Recommendations .
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 users configure the
environment according to the Siemens operational guidelines for industrial
security and follow the recommendations in the product manuals.
For additional information, please refer to Siemens Security Advisory
SSA-185638 .
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 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 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 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.
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