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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-22-013-02) Siemens SICAM A8000
14 January 2022
AusCERT Security Bulletin Summary
Product: Siemens SICAM A8000
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
CVE Names: CVE-2021-45034 CVE-2021-45033
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ICS Advisory (ICSA-22-013-02)
Siemens SICAM A8000
Original release date: January 13, 2022
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1. EXECUTIVE SUMMARY
o CVSS v3 9.9
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: SICAM A8000
o Vulnerabilities: Use of Hard-coded Credentials, Improper Access Control
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow a privileged user
to enable a debug port with default credentials and access to certain log
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SICAM A8000, a remote terminal unit, are affected:
o CP-8000 MASTER MODULE WITH I/O - 25/+70C (6MF2101-0AB10-0AA0): All
versions prior to v16.20
o CP-8000 MASTER MODULE WITH I/O - 40/+70C (6MF2101-1AB10-0AA0): All
versions prior to v16.20
o CP-8021 MASTER MODULE (6MF2802-1AA00): All versions prior to v16.20
o CP-8022 MASTER MODULE WITH GPRS (6MF2802-2AA00): All versions prior to
3.2 VULNERABILITY OVERVIEW
3.2.1 USE OF HARD-CODED CREDENTIALS CWE-798
An undocumented debug port uses hard-coded default credentials. If this port is
enabled by a privileged user, an attacker aware of the credentials could access
an administrative debug shell on the affected device.
CVE-2021-45033 has been assigned to this vulnerability. A CVSS v3 base score of
9.9 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/C:H/
3.2.2 IMPROPER ACCESS CONTROL CWE-284
The web server of the affected system allows access to logfiles and diagnostic
data generated by a privileged user. An unauthenticated attacker could access
the files by knowing the corresponding download links.
CVE-2021-45034 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/
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
Michael Messner of Siemens Energy reported these vulnerabilities to Siemens.
Siemens recommends updating to v16.20 or later .
As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. To operate the devices in a
protected IT environment, Siemens recommends users configure 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:
For more information about these vulnerabilities, see Siemens' security
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 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
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:
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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