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AUSCERT External Security Bulletin Redistribution
ESB-2021.1836
Advisory (icsa-21-147-04) Siemens JT2Go and Teamcenter Visualization
28 May 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens JT2Go
Siemens Teamcenter Visualization
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Access Confidential Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27002 CVE-2020-27001 CVE-2020-26999
CVE-2020-26998 CVE-2020-26991
Reference: ESB-2021.0495
ESB-2021.0125
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-147-04
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ICS Advisory (ICSA-21-147-04)
Siemens JT2Go and Teamcenter Visualization
Original release date: May 27, 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: JT2Go and Teamcenter Visualization
o Vulnerabilities: Untrusted Pointer Dereference, Out-of-bounds Read,
Stack-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could lead to arbitrary code
execution or information leakage.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products are affected:
o JT2Go: All versions prior to v13.1.0.2
o Teamcenter Visualization: All versions prior to v13.1.0.2
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS READ CWE-125
Affected applications lack proper validation of user-supplied data when parsing
PAR files. This could result in a memory access past the end of an allocated
buffer. An attacker could leverage this vulnerability to leak information.
CVE-2020-26998 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 OUT-OF-BOUNDS READ CWE-125
Affected applications lack proper validation of user-supplied data when parsing
of PAR files. This could result in a memory access past the end of an allocated
buffer. An attacker could leverage this vulnerability to leak information.
CVE-2020-26999 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 ).
3.2.3 STACK-BASED BUFFER OVERFLOW CWE-121
Affected applications lack proper validation of user-supplied data when parsing
of PAR files. This could result in a stack-based buffer overflow. An attacker
could leverage this vulnerability to execute code in the context of the current
process.
CVE-2020-27001 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 ).
3.2.4 OUT-OF-BOUNDS READ CWE-125
Affected applications lack proper validation of user-supplied data when parsing
PAR files. This could result in a memory access past the end of an allocated
buffer. An attacker could leverage this vulnerability to access data in the
context of the current process.
CVE-2020-27002 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 )
3.2.5 UNTRUSTED POINTER DEREFERENCE CWE-822
Affected applications lack proper validation of user-supplied data when parsing
ASM files. This could lead to pointer dereferences of a value obtained from an
untrusted source. An attacker could leverage this vulnerability to execute code
in the context of the current process.
CVE-2020-26991 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 ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Michael DePlante (@izobashi), Francis Provencher {PRL}, and rgod, working with
Trend Micro's Zero Day Initiative reported four of these vulnerabilities to
CISA. Carsten Eiram from Risk Based Security reported the fifth (
CVE-2020-26991 ) to Siemens.
4. MITIGATIONS
Siemens recommends the following:
o JT2Go: Update to v13.1.0.2 or later
o Teamcenter Visualization: Update to v13.1.0.2 or later (Login required)
o Avoid opening untrusted files from unknown sources in JT2Go and Teamcenter
Visualization
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.
Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
For more information see Siemens Security Advisory SSA-695540
CISA 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.
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