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AUSCERT External Security Bulletin Redistribution
ESB-2023.2155
ICS Advisory | ICSA-23-103-12 Siemens Polarion ALM
14 April 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Polarion ALM
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-28828
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-103-12
Comment: CVSS (Max): 5.3 CVE-2023-28828 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
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ICS Advisory (ICSA-23-103-12)
Siemens Polarion ALM
Release Date
April 13, 2023
As of January 10, 2023, CISA will no longer be updating ICS security advisories
for Siemens product vulnerabilities beyond the initial advisory. For the most
up-to-date information on vulnerabilities in this advisory, please see Siemens'
ProductCERT Security Advisories (CERT Services | Services | Siemens Global).
1. EXECUTIVE SUMMARY
o CVSS v3 5.3
o ATTENTION: Exploitable remotely/high attack complexity
o Vendor: Siemens
o Equipment: Polarion ALM
o Vulnerability: Improper Restriction of XML External Entity Reference
2. RISK EVALUATION
Successful exploitation of this vulnerability may allow an attacker to
potentially disclose confidential data.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Siemens Polarion ALM products are affected:
o Polarion ALM: all versions prior to V2304.0
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER RESTRICTION OF XML EXTERNAL ENTITY REFERENCE CWE-611
The application contains an XML external entity injection (XXE) vulnerability.
This could allow an attacker to view files on the application server
filesystem.
CVE-2023-28828 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( CVSS:3.1/AV:N/AC:H/PR:N/
UI:R/S:U/C:H/I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Cale Anderson reported this vulnerability to Siemens.
4. MITIGATIONS
Siemens has released an update for Polarion ALM and recommends updating to the
latest version (V2304.0) , as well as updating specific configurations to
mitigate against the vulnerability. The configuration changes to mitigate this
vulnerability will be default in Polarion V2304 and later versions.
Siemens recommends setting configurations as listed in SSA-632164 to mitigate
against external entity injection in OpenSAML 4.x parser. This will be included
by default in Polarion V2304 and later versions.
As a general security measure, Siemens recommends protecting network access to
devices with appropriate mechanisms. 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 the Siemens Industrial Security web page .
For further inquiries on security vulnerabilities in Siemens products and
solutions, users should contact the Siemens ProductCERT .
For more information, see the associated Siemens security advisory SSA-632164
in HTML and CSAF .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability.
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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited 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.
No known public exploits specifically target this vulnerability. This
vulnerability is exploitable remotely. This vulnerability has a high attack
complexity.
Related Advisories
Apr 13, 2023
ICS Advisory | ICSA-23-103-06
Siemens SIPROTEC 5 Devices
Apr 13, 2023
ICS Advisory | ICSA-23-103-09
Siemens SCALANCE XCM332
Apr 13, 2023
ICS Advisory | ICSA-23-103-13
Siemens SCALANCE X-200, X-200IRT, and X-300 Switch Families BadAlloc
Vulnerabilities
Apr 13, 2023
ICS Advisory | ICSA-23-103-01
Siemens Adaptec maxView Application
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