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AUSCERT External Security Bulletin Redistribution
ESB-2021.2403
Advisory (icsa-21-194-08) Siemens Solid Edge
15 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Solid Edge
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-34329 CVE-2021-34328 CVE-2021-34327
CVE-2021-34326
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-194-08
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ICS Advisory (ICSA-21-194-08)
Siemens Solid Edge
Original release date: July 13, 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 : Solid Edge
o Vulnerabilities : Heap-based Buffer Overflow
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could result in an
out-of-bounds write, a buffer overflow condition that may allow remote code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of Siemens Solid Edge, a portfolio of software tools,
are affected:
o Versions SE2021MP5 and prior
3.2 VULNERABILITY OVERVIEW
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
The plmxmlAdapterSE70.dll library in affected applications lacks proper
validation of user-supplied data when parsing PAR files. This could result in
an out-of-bounds write past the fixed-length heap-based buffer. An attacker
could leverage this vulnerability to execute code in the context of the current
process.
CVE-2021-34326 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 HEAP-BASED BUFFER OVERFLOW CWE-122
The plmxmlAdapterSE70.dll library in affected applications lacks proper
validation of user-supplied data when parsing ASM files. This could result in
an out-of-bounds write past the fixed-length heap-based buffer. An attacker
could leverage this vulnerability to execute code in the context of the current
process.
CVE-2021-34327 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 HEAP-BASED BUFFER OVERFLOW CWE-122
The plmxmlAdapterSE70.dll library in affected applications lacks proper
validation of user-supplied data when parsing PAR files. This could result in
an out-of-bounds write past the fixed-length heap-based buffer. An attacker
could leverage this vulnerability to execute code in the context of the current
process.
CVE-2021-34328 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 HEAP-BASED BUFFER OVERFLOW CWE-122
The plmxmlAdapterSE70.dll library in affected applications lacks proper
validation of user-supplied data when parsing PAR files. This could result in
an out-of-bounds write past the fixed-length heap-based buffer. An attacker
could leverage this vulnerability to execute code in the context of the current
process.
CVE-2021-34329 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
Mat Powell, working with Trend Micro's Zero Day Initiative, reported these
vulnerabilities to CISA.
4. MITIGATIONS
Siemens has identified the following specific mitigations and workarounds users
can apply to reduce the risk:
o Update to SE2021MP5 or later version (login required)
o Avoid opening untrusted files from unknown sources in Solid Edge
As a general security measure, Siemens strongly recommends users protect
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 Siemens Operational Guidelines for Industrial Security
, and follow the recommendations in the product manual.
Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/industrialsecurity
For more information about this issue, please see Siemens Security Advisory
SSA-173615 .
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 that 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 that VPNs may have vulnerabilities and should
be updated to the most current version available. Also recognize that 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 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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