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             AUSCERT External Security Bulletin Redistribution

                               ESB-2022.0604
 Advisory (icsa-21-350-16) Siemens Healthineers syngo fastView (Update A)
                             11 February 2022

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens Healthineers syngo fastView
Publisher:         ICS-CERT
Operating System:  Network Appliance
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-45465 CVE-2021-42028 CVE-2021-40367

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-21-350-16

Comment: CVSS (Max):  7.8 CVE-2021-40367 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
         CVSS Source: ICS-CERT

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ICS Advisory (ICSA-21-350-16)

Siemens Healthineers syngo fastView (Update A)

Original release date: February 10, 2022

Legal Notice

All information products included in https://us-cert.cisa.gov/ics are provided
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(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
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1. EXECUTIVE SUMMARY

  o CVSS v3 7.8
  o ATTENTION: Low attack complexity
  o Vendor: Siemens Healthineers, a subsidiary of Siemens
  o Equipment: syngo fastView

- --------- Begin Update A Part 1 of 2 --------

  o Vulnerabilities: Out-of-bounds Write, Write-what-where Condition

- --------- End Update A Part 1 of 2 --------

2. UPDATE INFORMATION

This updated advisory is a follow-up to the original advisory titled
ICSA-21-350-16 Siemens Healthineers syngo fastView that was published December
16, 2021, to the ICS webpage on www.cisa.gov/uscert.

3. RISK EVALUATION

Successful exploitation of these vulnerabilities could lead to a crash of the
application or arbitrary code execution.

4. TECHNICAL DETAILS

4.1 AFFECTED PRODUCTS

The following versions of syngo fastView, a software for digital imaging and
communications, are affected:

  o Syngo fastView: All versions

4.2 VULNERABILITY OVERVIEW

4.2.1 OUT-OF-BOUNDS WRITE CWE-787

The affected application lacks proper validation of user-supplied data when
parsing DICOM files, which could result in an out-of-bounds write past the end
of an allocated structure. An attacker could leverage this vulnerability to
execute code in the context of the current process.

CVE-2021-40367 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 ).

4.2.2 OUT-OF-BOUNDS WRITE CWE-787

The affected application lacks proper validation of user-supplied data when
parsing BMP files, which could result in an out-of-bounds write past the end of
an allocated structure. An attacker could leverage this vulnerability to
execute code in the context of the current process.

CVE-2021-42028 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 ).

- --------- Begin Update A Part 2 of 2 --------

4.2.3 WRITE-WHAT-WHERE CONDITION CWE-123

The affected application lacks proper validation of user-supplied data when
parsing BMP files. This could result in a write-what-where condition and an
attacker could leverage this vulnerability to execute code in the context of
the current process.

CVE-2021-45465 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 ).

- --------- End Update A Part 2 of 2 --------

4.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Healthcare and Public Health
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

4.4 RESEARCHER

Tran Van Khang - khangkito (VinCSS) working with Trend Micro Zero Day
Initiative reported these vulnerabilities to Siemens and CISA.

5. MITIGATIONS

Siemens Healthineers has identified the following specific workarounds and
mitigations that customers can apply to reduce the risk:

  o Download syngo fastView only from the SHS official page .
  o Avoid opening untrusted files from unknown sources in syngo fastView.
  o Remove syngo fastView after viewing the required files.

For additional information, please refer to Siemens Healthineers' Security
Advisory SHSA-688797

In addition, Siemens Healthineers recommends the following:

  o Ensure appropriate backups and system restoration procedures are in place.
  o Securely delete any backup files that are no longer needed.
  o For specific patch and remediation guidance information contact a Siemens
    Healthineers Customer Service Engineer, portal, or the Regional Support
    Center.

For further inquiries on security vulnerabilities in Siemens Healthineers
products and solutions, please contact Siemens Healthineers .

CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. 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 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 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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