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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2398
         Advisory (icsa-20-196-07) Siemens Opcenter Execution Core
                               15 July 2020

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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

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ICS Advisory (ICSA-20-196-07)

Siemens Opcenter Execution Core

Original release date: July 14, 2020

Legal Notice

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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
  o Vulnerabilities: Cross-site Scripting, SQL Injection, Improper Access
    Control

2. RISK EVALUATION

Successful exploitation of these vulnerabilities may allow an attacker to
obtain session cookies, read and modify application data, read internal
information, and perform unauthorized changes. 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.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

The following products are affected:

  o Camstar Enterprise Platform: All versions
  o Opcenter Execution Core: All versions prior to v8.2

3.2 VULNERABILITY OVERVIEW

3.2.1 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 ).

3.2.2 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 ).

3.2.3 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 )

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Siemens reported these vulnerabilities to CISA.

4. MITIGATIONS

Siemens recommends users upgrade to Opcenter Execution Core v8.2 (login
required).

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.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.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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