ESB-2017.1707.3 - UPDATE [Appliance] Siemens SIPROTEC 4 and SIPROTEC Compact: Multiple vulnerabilities 2017-07-28

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             AUSCERT External Security Bulletin Redistribution

                              ESB-2017.1707.3
     Advisory (ICSA-17-187-03) Siemens SIPROTEC 4 and SIPROTEC Compact
                               28 July 2017

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

Product:           Siemens SIPROTEC 4
                   SIPROTEC Compact
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Administrator Compromise -- Remote/Unauthenticated
                   Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-7114 CVE-2016-7113 CVE-2016-7112
                   CVE-2016-4785 CVE-2016-4784 CVE-2015-5374

Reference:         ESB-2016.2101
                   ESB-2016.1281
                   ESB-2015.1913

Original Bulletin: 
   https://ics-cert.us-cert.gov/advisories/ICSA-17-187-03

Revision History:  July 28 2017: Updated affected products and mitigations
                   July 21 2017: Updated devices list.
                   July  7 2017: Initial Release

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Advisory (ICSA-17-187-03B)

Siemens SIPROTEC 4 and SIPROTEC Compact (Update B)

Original release date: July 06, 2017 | Last revised: July 27, 2017

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/.

CVSS v3 8.6

ATTENTION: Remotely exploitable/low skill level to exploit.

Vendor: Siemens

Equipment: SIPROTEC 4 and SIPROTEC Compact

Vulnerabilities: Improper Input Validation, Missing Authorization,
Improper Authentication

UPDATE INFORMATION

This updated advisory is a follow-up to the updated advisory titled
ICSA-17-187-03A Siemens SIPROTEC 4 and SIPROTEC Compact that was published
July 18, 2017, on the NCCIC/ICS-CERT web site.

AFFECTED PRODUCTS

Siemens reports that the vulnerabilities affect the following SIPROTEC 4 and
SIPROTEC Compact protection, control, measurement, and automation devices:

- --------- Begin Update B Part 1 of 2 --------

    Firmware variants for EN100 Ethernet modules as optional for SIPROTEC
    4 and SIPROTEC Compact:
        Firmware variant PROFINET IO: All versions prior to V1.04.01,
        Firmware variant Modbus TCP: All versions prior to  V1.10.01,
        Firmware variant DNP3 TCP: All versions prior to V1.03, and
        Firmware variant IEC 104: All versions prior to V1.21.
    EN100 Ethernet module included in SIPROTEC Merging Unit 6MU80: All
    firmware versions prior to V1.02.02
    SIPROTEC 7SJ66: All versions prior to V4.23
    SIPROTEC 7SJ686: All versions prior to V4.86
    SIPROTEC 7UT686: All versions prior to V4.01
    SIPROTEC 7SD686: All versions prior to V4.04

- --------- End Update B Part 1 of 2 ----------

IMPACT

Successful exploitation of these vulnerabilities could cause a
denial-of-service condition, allow an attacker access to sensitive
information, or allow an attacker to perform administrative functions.

MITIGATION

- --------- Begin Update B Part 2 of 2 --------

Siemens provides updates for the following affected products and recommends
users update to the latest version:

    Firmware variants for EN100 Ethernet modules as optional for SIPROTEC
    4 and SIPROTEC Compact:
        Firmware variant PROFINET IO: Update to V1.04.01
        Firmware variant Modbus TCP: Update to V1.10.01
        Firmware variant DNP3 TCP: Update to V1.03
        Firmware variant IEC 104: Update to V1.21

http://www.siemens.com/downloads/siprotec-4

http://www.siemens.com/downloads/siprotec-compact

    EN100 Ethernet module included in SIPROTEC Merging Unit 6MU80: Update
    to firmware V1.02.02 by contacting the Siemens energy hotline at:
    support.energy@siemens.com
    SIPROTEC 7SJ66: update to firmware V4.23

http://www.siemens.com/downloads/siprotec-4

    SIPROTEC 7SJ686: update to firmware V4.86

http://www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=51

    SIPROTEC 7UT686: update to firmware V4.01

http://www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=68

    SIPROTEC 7SD686: update to firmware V4.04

http://www.siemensenergysector.com/ProductRelatedDown.aspx?ProductId=64

- --------- End Update B Part 2 of 2 ----------

Siemens is preparing updates for the remaining affected products and
recommends the following mitigations in the meantime:

    Apply secure substation concepts and defense-in-depth measures.

Please see the specific product manual for more information. Manuals can
be obtained from the downloads menu at the following Siemens web site:

http://www.siemens.com/gridsecurity

    Restrict network access to Port 80/TCP and Port 50000/UDP

Siemens recommends users protect network access with appropriate mechanisms
such as firewalls, segmentation, and VPNs. Siemens also advises that users
configure the operational environment according to Siemens' Operational
Guidelines for Industrial Security:

https://www.siemens.com/cert/operational-guidelines-industrial-security

For more information on this vulnerability and more detailed mitigation
instructions, please see Siemens Security Advisory SSA-323211 at the
following location:

http://www.siemens.com/cert/advisories

ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:

    Minimize network exposure for all control system devices and/or systems,
    and ensure that they are not accessible from the Internet.
    Locate control system networks and remote devices behind firewalls,
    and isolate them from the business network.
    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.

ICS-CERT reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

ICS-CERT 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 in the ICS-CERT Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT web site.

Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to ICS-CERT for
tracking and correlation against other incidents.

In addition, ICS-CERT recommends that users take the following measures
to protect themselves from social engineering attacks:

    Do not click web links or open unsolicited attachments in email messages.
    Refer to Recognizing and Avoiding Email Scams for more information on
    avoiding email scams.
    Refer to Avoiding Social Engineering and Phishing Attacks for more
    information on social engineering attacks.

No known public exploits specifically target these vulnerabilities.

VULNERABILITY OVERVIEW

IMPROPER INPUT VALIDATION CWE-20

Specially crafted packets sent to Port 50000/UDP could cause a denial of
service of the affected device. A manual reboot may be required to recover
the service of the device.

CVE-2015-5374 has been assigned to this vulnerability. A CVSS v3
base score of 8.6 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).

MISSING AUTHORIZATION CWE-862

The integrated web server (Port 80/TCP) of the affected devices could allow
remote attackers to obtain sensitive device information if network access
was obtained.

CVE-2016-4784 has been assigned to this vulnerability. A CVSS v3
base score of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

MISSING AUTHORIZATION CWE-862

The integrated web server (Port 80/TCP) of the affected devices could allow
remote attackers to obtain a limited amount of device memory content if
network access was obtained.

CVE-2016-4785 has been assigned to this vulnerability. A CVSS v3
base score of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

MISSING AUTHORIZATION CWE-862

Attackers with network access to the device's web interface (Port
80/TCP) could circumvent authentication and perform certain administrative
operations.

CVE-2016-7112 has been assigned to this vulnerability. A CVSS v3
base score of 5.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

IMPROPER INPUT VALIDATION CWE-20

Specially crafted packets sent to Port 80/TCP could cause the affected
device to go into defect mode.

CVE-2016-7113 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).

IMPROPER AUTHENTICATION CWE-287

Attackers with network access to the device's web interface (Port
80/TCP) could circumvent authentication and perform certain administrative
operations. A legitimate user must be logged into the web interface for
the attack to be successful.

CVE-2016-7114 has been assigned to this vulnerability. A CVSS v3
base score of 4.3 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N).

RESEARCHER

Siemens reported these vulnerabilities to ICS-CERT when they made firmware
available to fix them.

BACKGROUND

Critical Infrastructure Sector: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900

For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov

ICS-CERT 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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