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AUSCERT External Security Bulletin Redistribution
ESB-2020.2398.3
Advisory (icsa-20-196-07) Siemens Opcenter Execution Core
13 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens Opcenter Execution Core
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Existing Account
Access Confidential Data -- Existing Account
Provide Misleading Information -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-7578 CVE-2020-7577 CVE-2020-7576
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-20-196-07
Revision History: January 13 2021: Updated impact information
August 12 2020: CVE-2020-7576 affects Opcenter Execution Core: Versions 8.2 and prior
July 15 2020: Initial Release
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ICS Advisory (ICSA-20-196-07)
Siemens Opcenter Execution Core (Update B)
Original release date: January 12, 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 8.5
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Siemens
o Equipment: Opcenter Execution Core
- --------- Begin Update B Part 1 of 5 ---------
o Vulnerabilities: Cross-site Scripting, SQL Injection, Improper Access
Control, Insufficiently Protected Credentials
- --------- End Update B Part 1 of 5 ---------
2. UPDATE INFORMATION
This updated advisory is a follow-up to the original advisory titled
ICSA-20-196-07 Siemens Opcenter Execution Core (Update A) that was published
August 11, 2020, to the ICS webpage on us-cert.cisa.gov.
3. RISK EVALUATION
- --------- Begin Update B Part 2 of 5 ---------
Successful exploitation of these vulnerabilities may allow an attacker to
obtain session cookies, read and modify application data, read internal
information, perform unauthorized changes, and obtain passwords of currently
logged in users. Should the attacker gain access to the session cookies, they
could then hijack the session and perform arbitrary actions in the name of the
victim.
- --------- End Update B Part 2 of 5 ---------
4. TECHNICAL DETAILS
4.1 AFFECTED PRODUCTS
The following products are affected:
- --------- Begin Update B Part 3 of 5 ---------
o Camstar Enterprise Platform: All versions. Only affected by CVE-2020-7576,
CVE-2020-7577, CVE-2020-7578
o Opcenter Execution Core: All versions prior to v8.2. Affected by
CVE-2020-7576, CVE-2020-7577, CVE-2020-7578
o Opcenter Execution Core: Version 8.2. Affected by CVE-2020-7576,
CVE-2020-28390
o Opcenter Execution Core: Versions 8.3. Affected by CVE-2020-28390
- --------- End Update B Part 3 of 5 ---------
4.2 VULNERABILITY OVERVIEW
4.2.1 IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
SCRIPTING') CWE-79
An authenticated user with the ability to create containers, packages, or
register defects could perform stored cross-site scripting (XSS) attacks within
the vulnerable software.
CVE-2020-7576 has been assigned to this vulnerability. A CVSS v3 base score of
8.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/C:H/
I:L/A:N ).
4.2.2 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL
INJECTION') CWE-89
An authenticated user could perform an SQL injection attack by passing a
modified SQL query through an input field to the back-end server.
CVE-2020-7577 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:N ).
4.2.3 IMPROPER ACCESS CONTROL CWE-284
Authenticated users could have access to resources they normally would not
have. This vulnerability could allow an attacker to view internal information
and perform unauthorized changes.
CVE-2020-7578 has been assigned to this vulnerability. A CVSS v3 base score of
8.1 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/
I:H/A:N ).
- --------- Begin Update B Part 4 of 5 ---------
4.2.4 INSUFFICIENTLY PROTECTED CREDENTIALS CWE-522
The affected application leaks passwords of logged-in users when handling web
client sessions. A local attacker who has access to the Web Client Session
Storage may be able to obtain this information.
CVE-2020-28390 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:N/A:N ).
- --------- End Update B Part 4 of 5 ---------
4.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
4.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
5. MITIGATIONS
- --------- Begin Update B Part 5 of 5 ---------
o Siemens recommends users upgrade to Opcenter Execution Core v8.4 or later
(login required).
- --------- End Update B Part 5 of 5 ---------
Siemens has identified the following specific workarounds and mitigations that
customers can apply to reduce the risk:
o Configure a web application firewall to filter traffic containing XSS
Injection and SQL Injections
o Restrict access to application webserver for trusted users only
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 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 on these vulnerabilities and associated software updates,
please see Siemens security advisory SSA-604937
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.
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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