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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.2525
         Advisory (icsa-19-190-05) Siemens SIPROTEC 5 and DIGSI 5
                               10 July 2019

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

Product:           Siemens SIPROTEC 5 and DIGSI 5
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Modify Arbitrary Files   -- Remote/Unauthenticated
                   Create Arbitrary Files   -- Remote/Unauthenticated
                   Delete Arbitrary Files   -- Remote/Unauthenticated
                   Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-10931 CVE-2019-10930 

Original Bulletin: 
   https://www.us-cert.gov/ics/advisories/icsa-19-190-05

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ICS Advisory (ICSA-19-190-05)

Siemens SIPROTEC 5 and DIGSI 5

Original release date: July 09, 2019

Legal Notice

All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 7.5
  o ATTENTION: Exploitable remotely/low skill level to exploit
  o Vendor: Siemens
  o Equipment: SIPROTEC 5 and DIGISI 5
  o Vulnerabilities: Improper Input Validation

2. RISK EVALUATION

Successful exploitation of these vulnerabilities could allow a
denial-of-service condition and limited control of file upload, download, and
delete functions.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Siemens reports that the vulnerability affects the following SIPROTEC 5 and
DIGSI 5 products:

  o SIPROTEC 5 (All versions prior to v7.90) with CPU variants CP300 and CP100
    and the respective Ethernet communication modules listed below:
       6MD85
       6MD86
       6MD89
       7UM85
       7SA87
       7SD87
       7SL87
       7VK87
       7SA82
       7SA86
       7SD82
       7SD86
       7SL82
       7SL86
       7SJ86
       7SK82
       7SK85
       7SJ82
       7SJ85
       7UT82
       7UT85
       7UT86
       7UT87
       7VE85
       All types not listed above
           All versions
  o SIPTROTEC 5 with CPU variants CP200 and the respective Ethernet
    communication modules
       All versions
  o DIGSI 5
       All Versions prior to v7.90

3.2 VULNERABILITY OVERVIEW

3.2.1 IMPROPER INPUT VALIDATION CWE-20

A remote attacker could use specially crafted packets sent to Port 443/TCP to
upload, download, or delete files in certain parts of the file system.

CVE-2019-10930 has been assigned to this vulnerability. A CVSS v3 base score of
7.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:L/I:L/A:L ).

3.2.2 IMPROPER INPUT VALIDATION CWE-20

Specially crafted packets sent to Port 443/TCP could cause a denial-of-service
condition.

CVE-2019-10931 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).

3.3 BACKGROUND

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

3.4 RESEARCHER

Pierre Capillon, Nicolas Iooss, and Jean-Baptiste Galet from Agence Nationale
de la Securite des Systemes d'Information (ANSSI) reported these
vulnerabilities to Siemens.

4. MITIGATIONS

Siemens recommends users upgrade to V7.90 where available and apply the
following specific mitigations:

SIPROTEC 5 device types 6MD85, 6MD86, 6MD89, 7UM85, 7SA87, 7SD87, 7SL87, 7VK87,
7SA82, 7SA86, 7SD82, 7SD86, 7SL82, 7SL86, 7SJ86, 7SK82, 7SK85, 7SJ82, 7SJ85,
7UT82, 7UT85, 7UT86, 7UT87 and 7VE85 with CPU variants CP300 and CP100 and the
respective Ethernet communication modules:

  o Update to firmware version V7.90. Search for 'SIPROTEC 5 - DIGSI Device
    Drivers V7.90' on the Siemens Industry Online Support site. Firmware
    version V7.90 for the communication modules can also be found on each
    device specific download page. Applying the update causes the device /
    module to go through a single restart cycle.

https://support.industry.siemens.com/cs/ww/en/

DIGSI 5 engineering software:

  o Update to DIGSI 5 V7.90 and activate the client authorization feature:

https://support.industry.siemens.com/cs/us/en/view/109767686

All other SIPROTEC 5 device types with CPU variants CP300, CP200, and CP100 and
the respective Ethernet communication modules:

  o Block access to Port 443/TCP e.g. with an external firewall.

For more information on this vulnerability and associated software updates,
please see Siemens security advisory SSA-899560 on their website: https://
www.siemens.com/cert/advisories

NCCIC 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.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC also provides a section for control systems security recommended
practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking
and correlation against other incidents.

No known public exploits specifically target these vulnerabilities.

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