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AUSCERT External Security Bulletin Redistribution
ESB-2022.1714
Advisory (icsa-22-104-05) Siemens OpenSSL Vulnerabilities in
Industrial Products
20 April 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens OpenSSL Vulnerabilities in Industrial Products
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3449
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-104-05
Comment: CVSS (Max): 5.9 CVE-2021-3449 (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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ICS Advisory (ICSA-22-104-05)
Siemens OpenSSL Vulnerabilities in Industrial Products
Original release date: April 14, 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 5.9
o ATTENTION: Exploitable remotely/high attack complexity
o Vendor: Siemens
o Equipment: Siemens Industrial Products
o Vulnerability: NULL Pointer Dereference
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow an unauthenticated
attacker to cause a denial-of-service condition if a maliciously crafted
renegotiation message is sent.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports this vulnerability affects the following products:
o RUGGEDCOM CROSSBOW Station Access Controller: All versions since and
including v5.2.0 only when running on ROX v2.14.0
o RUGGEDCOM RCM1224: Versions 6.2 through 7.1
o SCALANCE LPE9403 (6GK5998-3GS00-2AC2): All versions prior to v1.1
o SCALANCE M804PB (6GK5804-0AP00-2AA2): Versions 6.2 through 7.1
o SCALANCE M812-1 ADSL-Router (Annex A) (6GK5812-1AA00-2AA2): Versions 6.2
through 7.1
o SCALANCE M812-1 ADSL-Router (Annex B) (6GK5812-1BA00-2AA2): Versions 6.2
through 7.1
o SCALANCE M816-1 ADSL-Router (Annex A) (6GK5816-1AA00-2AA2): Versions 6.2
through 7.1
o SCALANCE M816-1 ADSL-Router (Annex B) (6GK5816-1BA00-2AA2): Versions 6.2
through 7.11
o SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2): Versions 6.2 through 7.1
o SCALANCE M874-2 (6GK5874-2AA00-2AA2): Versions 6.2 through 7.1
o SCALANCE M874-3 (6GK5874-3AA00-2AA2): Versions 6.2 through 7.1SCALANCE
M876-3 (6GK5876-3AA02-2BA2): Versions 6.2 through 7.1SCALANCE M876-3 (ROK)
(6GK5876-3AA02-2EA2): Versions 6.2 through 7.1SCALANCE M876-4 (EU)
(6GK5876-4AA00-2BA2): Versions 6.2 through 7.1SCALANCE M876-4 (NAM)
(6GK5876-4AA00-2DA2): Versions 6.2 through 7.1
o SCALANCE S602: All versions since and including v4.1
o SCALANCE S612: All versions since and including v4.1
o SCALANCE S615 (6GK5615-0AA00-2AA2): Versions 6.2 through 7.1
o SCALANCE S623: All versions since and including v4.1
o SCALANCE S627-2M: All versions since and including v4.1
o SCALANCE SC622-2C (6GK5622-2GS00-2AC2): Versions 2.0 through 2.1.4
o SCALANCE SC632-2C (6GK5632-2GS00-2AC2): Versions 2.0 through 2.1.4
o SCALANCE SC636-2C (6GK5636-2GS00-2AC2): Versions 2.0 through 2.1.4
o SCALANCE SC642-2C (6GK5642-2GS00-2AC2): Versions 2.0 through 2.1.4
o SCALANCE SC646-2C (6GK5646-2GS00-2AC2): Versions 2.0 through 2.1.4SCALANCE
W1748-1 M12 (6GK5748-1GY01-0AA0): Versions 2.0 through 3.0
o SCALANCE W1748-1 M12 (6GK5748-1GY01-0TA0): Versions 2.0 through 3.0
o SCALANCE W1788-1 M12 (6GK5788-1GY01-0AA0): Versions 2.0 through 3.0
o SCALANCE W1788-2 EEC M12 (6GK5788-2GY01-0TA0): Versions 2.0 through 3.0
o SCALANCE W1788-2 M12 (6GK5788-2GY01-0AA0): Versions 2.0 through 3.0
o SCALANCE W1788-2IA M12 (6GK5788-2HY01-0AA0): Versions 2.0 through 3.0
o SCALANCE W-700 IEEE 802.11n family: All versions since and including v6.5
o SCALANCE XB-200: All versions prior to v4.3
o SCALANCE XC-200: All versions prior to v4.3
o SCALANCE XF-200BA: All versions prior to v4.3
o SCALANCE XM-400: All versions prior to v6.4
o SCALANCE XP-200: All versions prior to v4.3
o SCALANCE XR-300WG: All versions prior to v4.3
o SCALANCE XR-500 Family: All versions prior to v6.4
o SIMATIC Cloud Connect 7 CC712 (6GK1411-1AC00): Versions 1.1 through 1.6
o SIMATIC Cloud Connect 7 CC716 (6GK1411-5AC00): Versions 1.1 through 1.6
o SIMATIC CP 1242-7 GPRS V2 (6GK7242-7KX31-0XE0): Versions 3.1 through 3.3
o SIMATIC CP 1243-1 (incl. SIPLUS variants): All versions since and including
v3.1
o SIMATIC CP 1243-7 LTE EU (6GK7243-7KX30-0XE0): Versions 3.1 through 3.3
o SIMATIC CP 1243-7 LTE US (6GK7243-7SX30-0XE0): Versions 3.1 through 3.3
o SIMATIC CP 1243-8 IRC (6GK7243-8RX30-0XE0): All versions since and
including v3.1
o SIMATIC CP 1542SP-1 IRC (incl. SIPLUS variants): All versions since and
including v2.1
o SIMATIC CP 1543-1 (6GK7543-1AX00-0XE0): Versions 2.2 through 3.0
o SIMATIC CP 1543SP-1 (incl. SIPLUS variants): All versions since and
including v2.1
o SIMATIC CP 1545-1 (6GK7545-1GX00-0XE0): All versions since and including
v1.0
o SIMATIC HMI Comfort Outdoor Panels 7" & 15" (incl. SIPLUS variants): All
versions prior to V17.0 Upd 2
o SIMATIC HMI Comfort Panels 4" - 22" (incl. SIPLUS variants): All versions
prior to V17.0 Upd 2
o SIMATIC HMI KTP Mobile Panels: All versions prior to v17.0 Upd 2
o SIMATIC Logon: Versions 1.6 Upd 2 through 1.6 Upd 5
o SIMATIC MV540 H (6GF3540-0GE10): All versions prior to v3.1
o SIMATIC MV540 S (6GF3540-0CD10): All versions prior to v3.1
o SIMATIC MV550 H (6GF3550-0GE10): All versions prior to v3.1
o SIMATIC MV550 S (6GF3550-0CD10): All versions prior to v3.1
o SIMATIC MV560 U (6GF3560-0LE10): All versions prior to v3.1
o SIMATIC MV560 X (6GF3560-0HE10): All versions prior to v3.1
o SIMATIC PCS 7 TeleControl: All versions
o SIMATIC PCS neo: All versions prior to v3.1
o SIMATIC PDM: Versions 9.1 Upd 7 through 9.2 SP 1
o SIMATIC Process Historian OPC UA Server: All versions 2019 through 2020 Upd
1
o SIMATIC RF166C: All versions
o SIMATIC RF185C: All versions
o SIMATIC RF186C: All versions
o SIMATIC RF186CI: All versions
o SIMATIC RF188C: All versions
o SIMATIC RF188CI: All versions
o SIMATIC RF360R: All versions
o SIMATIC RF600R family: All versions prior to v4.0
o SIMATIC S7-1200 CPU family (incl. SIPLUS variants): All versions prior to
v4.5.2
o SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (MLFB: 6ES7518-4AX00-1AC0,
6AG1518-4AX00-4AC0, incl. SIPLUS variant): All versions prior to v2.9.3
o SIMATIC WinCC Runtime Advanced: All versions prior to v17 Update 1
o SIMATIC WinCC TeleControl: All versions
o SINAMICS Connect 300: All versions
o SINEC NMS: Versions 1.0 SP1 through 1.0 SP2
o SINEMA Server: Versions 14 through 14 SP3
o SINUMERIK OPC UA Server: All versions prior to v3.1 SP1
o SIPLUS NET CP 1543-1 (6AG1543-1AX00-2XE0): Versions 2.2 through 3.0
o SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0): Versions 2.0 through 2.2
o TIA Administrator: All versions prior to v1.0 SP4
o TIM 1531 IRC (6GK7543-1MX00-0XE0): Versions 2.0 through 2.2
3.2 VULNERABILITY OVERVIEW
3.2.1 NULL POINTER DEREFERENCE CWE-476
An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation
ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits
the signature_algorithms extension, where it was present in the initial
ClientHello, but includes a signature_algorithms_cert extension, then a NULL
pointer dereference will occur, leading to a crash and a denial-of-service
condition.
A server is only vulnerable if it has TLSv1.2 and renegotiation enabled, which
is the default configuration. OpenSSL TLS clients are not impacted by this
issue. All OpenSSL 1.1.1 versions are affected by this issue. Users of these
versions should upgrade to OpenSSL 1.1.1k. OpenSSL 1.0.2 is not impacted by
this issue. This vulnerability is fixed in OpenSSL 1.1.1k.
CVE-2021-3449 has been assigned to this vulnerability. A CVSS v3 base score of
5.9 has been calculated. the CVSS vector string is ( AV:N/AC:H/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 this vulnerability to CISA.
4. MITIGATIONS
Siemens has released updates for several affected products and recommends
updating to the latest versions available. Siemens is preparing further updates
and recommends countermeasures for products where updates are not, or not yet
available. Please see Siemens SSA-772220 to determine if there is an update
available.
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 further inquiries on security vulnerabilities in Siemens products and
solutions, please contact Siemens .
Additional Reference: SSA-772220 (PDF)
Additional Reference: SSA-772220 (TXT)
Additional Reference: SSA-772220 (CSAF)
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 this vulnerability.
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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